Economic benefits

经济效益
  • 文章类型: Journal Article
    免耕农业和绿肥的结合是滋养土壤和增加作物产量的关键。然而,目前尚不清楚如何在免耕条件下提高绿肥的效率。我们对青贮玉米进行了两因素田间试验,以测试耕作方法和还田的效果。因素1是耕作的类型,分为常规耕作和免耕;因素2是将绿肥作为绿肥返回的不同方式,还进行了比较:无回报(NM),留茬(H),覆盖(HM),营业额(HR,仅适用于CT),和现场报道(LM,仅适用于NT)。我们的发现表明,不同的方法将紫云杉还田将提高玉米的产量和品质。在HM和LM的CT和NT中获得了最好的结果,分别。具体来说,HM导致最高的干物质质量和产量,CT比NM提高了35.4%和31.9%,分别。它还展示了最佳的经济和净能源表现。然而,其他处理对营养的有益利用和返回没有显著影响。LM通过提高土壤酶活性提高了NT下的产量,促进氮素转化和积累,并提高氮的利用效率,以更好地开发内核。总的来说,NTLM最适合利用和分配土壤养分并提高青贮玉米产量。这一发现支持了该地区青贮玉米生产中的生态高效栽培方法。
    The combination of no-till farming and green manure is key to nourishing the soil and increasing crop yields. However, it remains unclear how to enhance the efficiency of green manure under no-till conditions. We conducted a two-factor field trial of silage maize rotated with hairy vetch to test the effects of tillage methods and returning. Factor 1 is the type of tillage, which is divided into conventional ploughing and no-tillage; factor 2 is the different ways of returning hairy vetch as green manure, which were also compared: no return (NM), stubble return (H), mulching (HM), turnover (HR, for CT only), and live coverage (LM, for NT only). Our findings indicate that different methods of returning hairy vetch to the field will improve maize yield and quality. The best results were obtained in CT and NT in HM and LM, respectively. Specifically, HM resulted in the highest dry matter quality and yield, with improvements of 35.4% and 31.9% over NM under CT, respectively. It also demonstrated the best economic and net energy performance. However, other treatments had no significant effect on the beneficial utilization and return of nutrients. The LM improved yields under NT by boosting soil enzyme activity, promoting nitrogen transformation and accumulation, and increasing nitrogen use efficiency for better kernel development. Overall, NTLM is best at utilizing and distributing soil nutrients and increasing silage maize yield. This finding supports the eco-efficient cultivation approach in silage maize production in the region.
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  • 文章类型: Journal Article
    农业实践显著促进温室气体(GHG)排放,需要清洁生产技术来减少环境压力并实现可持续的玉米生产。地膜覆盖是黄土高原地区常用的方法。在这种做法中掺入缓释肥料作为尿素的替代品可以减少氮损失并提高作物生产力。结合这些技术代表了半干旱地区的一种新颖的农业方法。然而,这种整合对土壤碳储量(SOCS)的影响,碳足迹(CF),和经济效益受到的研究关注有限。因此,我们在半干旱的西北地区进行了一项为期八年的研究(2015-2022年),以量化四种处理的效果[尿素供应没有塑料薄膜覆盖(CK-U),不覆盖塑料薄膜的缓释肥料(CK-S),尿素与塑料薄膜覆盖(PM-U),和缓释肥料与地膜覆盖(PM-S)]对土壤肥力的影响,经济和环境效益。结果表明,氮肥是温室气体排放总量的主要贡献者(≥71.97%)。与其他治疗相比,PM-S提高平均粮食产量12.01%-37.89%,用水效率9.19%-23.33%,氮素积累量为27.07%-66.19%,和净收益率6.21%-29.57%。此外,PM-S降低CF12.87%-44.31%,每净收益率CF降低14.25%-41.16%。八年后,PM-S使SOCS(0-40厘米)增加2.46%,而PM-U下降了7.09%。这些发现强调了PM-S对地表土壤肥力的积极影响,经济收益,黄土高原春玉米生产的环境效益,强调其广泛采用和应用的潜力。
    Agricultural practices significantly contribute to greenhouse gas (GHG) emissions, necessitating cleaner production technologies to reduce environmental pressure and achieve sustainable maize production. Plastic film mulching is commonly used in the Loess Plateau region. Incorporating slow-release fertilizers as a replacement for urea within this practice can reduce nitrogen losses and enhance crop productivity. Combining these techniques represents a novel agricultural approach in semi-arid areas. However, the impact of this integration on soil carbon storage (SOCS), carbon footprint (CF), and economic benefits has received limited research attention. Therefore, we conducted an eight-year study (2015-2022) in the semi-arid northwestern region to quantify the effects of four treatments [urea supplied without plastic film mulching (CK-U), slow-release fertilizer supplied without plastic film mulching (CK-S), urea supplied with plastic film mulching (PM-U), and slow-release fertilizer supplied with plastic film mulching (PM-S)] on soil fertility, economic and environmental benefits. The results revealed that nitrogen fertilizer was the primary contributor to total GHG emissions (≥71.97%). Compared to other treatments, PM-S increased average grain yield by 12.01%-37.89%, water use efficiency by 9.19%-23.33%, nitrogen accumulation by 27.07%-66.19%, and net return by 6.21%-29.57%. Furthermore, PM-S decreased CF by 12.87%-44.31% and CF per net return by 14.25%-41.16%. After eight years, PM-S increased SOCS (0-40 cm) by 2.46%, while PM-U decreased it by 7.09%. These findings highlight the positive effects of PM-S on surface soil fertility, economic gains, and environmental benefits in spring maize production on the Loess Plateau, underscoring its potential for widespread adoption and application.
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  • 文章类型: Journal Article
    关于传统农业由于依赖大量使用合成投入而对全球气候变化和环境退化的负面影响,可持续的替代农业系统在世界范围内越来越受欢迎。绿色耕作制度是一种综合生产战略,特别是在中国将化肥减少与有机肥投入耦合。尽管它作为一个更可持续的系统在过去几十年中迅速发展,迄今为止,绿色农业系统尚未得到系统评估。我们使用苹果生产作为代表性案例来评估绿色农业系统的可持续性。在中国主要的苹果产区,绿色耕作使化肥氮(N)平均比常规减少46.8%(从412到219kgha-1),使粪肥N平均增加33.1%(从171到227kgha-1),导致氮素使用效率提高7.27至20.27%,氮素损失减少8.92%至11.56%,同时也导致四个省的4.34%至13.8%的收益率略有下降。通过增加土壤有机质,绿色果园的土壤肥力得到改善,总N,和可用的主要营养素。我们从摇篮到农场的大门生命周期评估显示,减少绿色农业有助于减少温室气体(GHG)排放平均12.6%。可能导致主要苹果产区每年减少165,239吨二氧化碳当量。此外,绿色农业在农民一级实现了39.3%的盈利能力(7180$ha-1yr-1)。我们的研究证明了绿色苹果生产在中国农业绿色发展中的潜力。这些发现为促进对可持续替代农业系统的理解以及对全球农业可持续发展的看法提供了见解。
    Sustainable alternative farming systems are gaining popularity worldwide because of the negative effects of conventional agriculture on global climate change and the environmental degradation caused by intensive use of synthetic inputs. The green farming system in China is an integrated production strategy that focuses on reducing chemical fertilizer use while increasing organic manure inputs. Despite their rapid growth as more sustainable systems over the past decades, green farming systems have not been systematically evaluated to date. We used apple production as a representative case to assess the sustainability of green farming systems. Across major apple-producing regions in China, green farming reduced the application of chemical fertilizer nitrogen (N) by 46.8% (from 412 to 219 kg ha-1) and increased that of manure N by 33.1% (from 171 to 227 kg ha-1) on average compared with conventional systems enhancing N use efficiency by 7.27-20.27% and reducing N losses by 8.92%-11.56%. It also slightly lowered yield by 4.34%-13.8% in four provinces. Soil fertility was improved in green orchards through increases in soil organic matter, total N, and available major nutrients. Our cradle-to-farm-gate life-cycle assessment revealed that green farming helped to mitigate greenhouse gas emissions by an average of 12.6%, potentially contributing to a reduction of 165 239 t CO2 eq annually in major apple-producing areas. In addition, green farming achieved 39.3% higher profitability ($7180 ha-1 year-1) at the farmer level. Our study demonstrates the potential of green production of apples for the development of sustainable agriculture in China. These findings advance our understanding of sustainable alternative farming systems and offer perspectives for the sustainable development of global agriculture.
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  • 文章类型: Journal Article
    扩大滴管的横向空间节省了灌溉设备成本(滴管和旁路),但这将导致小麦行之间谷物产量异质性的风险增加。调整小麦行距是调控行数异质性的有效栽培措施。在为期两年的现场实验中,通过在四种不同滴灌管横距和小麦行距的滴灌模式下,利用两个不同的水和肥料要求的春小麦品种(NS22和NS44),研究了产量性状和光合生理的变化[①TR4,滴管间距(DTS)为60厘米,小麦行水平间距(WRHS)为15cm;②TR6,DTS为90cm,WRHS为15cm;③TR6L,DTS为90厘米,WRHS为10厘米,块间间距(IBS)为35cm;④TR6S,DTS是80厘米,WRHS为10厘米,IBS为25cm]。结果表明,在15厘米等行间距条件下,在单管服务的小麦行数从四个(TR4,对照)增加到六个(TR6)之后,NS22和NS44表现出产率的显著下降。NS22(9.93%)的下降幅度高于NS44(9.04%),并且两个品种的粒重和劣质籽粒的平均籽粒灌浆率(AGFR)下降幅度更大(NS22:23.19%,13.97%;NS44:7.78%,5.86%)比优良晶粒(NS22:10.60%,8.33%;NS44:4.89%,4.62%)。在将TR6处理以缩小WRHS(从15到10厘米)并添加IBS(TR6L:35厘米;TR6S:25厘米)之后,在TR6L下NS22和NS44的第三小麦行(RW3)的每穗粒重(GWP)和劣质粒的AGFR显着增加了26.05%,8.22%,14.05%,10.50%,5.09%,5.01%,分别,根据TR6S,大幅增长20.78%,9.91%,16.19%,9.28%,5.01%,和4.14%,分别。GWP和AGFR的增加与旗叶面积的增加有关,净光合速率,叶绿素含量,相对含水量,PSII的实际光化学效率,和光化学猝灭系数。在TR4、TR6、TR6L、和TR6S,对于NS22和NS44,TR6S的产量均显着高于TR6和TR6L。此外,TR6S表现出最高的经济效益。
    Enlarging the lateral space of drip tubes saves irrigation equipment costs (drip tubes and bypass), but it will lead to an increased risk of grain yield heterogeneity between wheat rows. Adjusting wheat row spacing is an effective cultivation measure to regulate a row\'s yield heterogeneity. During a 2-year field experiment, we investigated the variations in yield traits and photosynthetic physiology by utilizing two different water- and fertilizer-demanding spring wheat cultivars (NS22 and NS44) under four kinds of drip irrigation patterns with different drip tube lateral spacing and wheat row spacing [① TR4, drip tube spacing (DTS) was 60 cm, wheat row horizontal spacing (WRHS) was 15 cm; ② TR6, DTS was 90 cm, WRHS was 15 cm; ③ TR6L, DTS was 90 cm, WRHS was 10 cm, inter-block spacing (IBS) was 35 cm; and ④ TR6S, DTS was 80 cm, WRHS was 10 cm, IBS was 25 cm]. The results showed that under 15-cm equal row spacing condition, after the number of wheat rows served by a single tube increased from four (TR4, control) to six (TR6), NS22 and NS44 exhibited a marked decline in yield. The decline of NS22 (9.93%) was higher than that of NS44 (9.04%), and both cultivars also showed a greater decrease in grain weight and average grain-filling rate (AGFR) of inferior grains (NS22: 23.19%, 13.97%; NS44: 7.78%, 5.86%) than the superior grains (NS22: 10.60%, 8.33%; NS44: 4.89%, 4.62%). After the TR6 was processed to narrow WRHS (from 15 to 10 cm) and add IBS (TR6L: 35 cm; TR6S: 25 cm), the grain weight per panicle (GWP) and AGFR of superior and inferior grains in the third wheat row (RW3) of NS22 and NS44 under TR6L increased significantly by 26.05%, 8.22%, 14.05%, 10.50%, 5.09%, and 5.01%, respectively, and under TR6S, they significantly increased by 20.78%, 9.91%, 16.19%, 9.28%, 5.01%, and 4.14%, respectively. The increase in GWP and AGFR was related to the increase in flag leaf area, net photosynthetic rate, chlorophyll content, relative water content, actual photochemical efficiency of PSII, and photochemical quenching coefficient. Among TR4, TR6, TR6L, and TR6S, for both NS22 and NS44, the yield of TR6S was significantly higher than that of TR6 and TR6L. Furthermore, TR6S showed the highest economic benefit.
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  • 文章类型: Journal Article
    本研究旨在估计在9个主要拉丁美洲城市中,遵守世界卫生组织(WHO)空气质量准则(AQGs)PM10和PM2.5限值的短期可预防死亡率和相关经济成本。
    我们使用时间序列回归模型估计了特定城市的PM-死亡率关联,并计算了归因死亡率分数。接下来,我们使用统计寿命值计算符合WHOAQGs限值的经济效益.
    在大多数城市,PM浓度超过WHOAQGs极限值的90%以上。发现PM10与浓度高于WHOAQGs极限值的1.88%的平均超额死亡率相关,而PM2.5为1.05%。相关的年度经济成本差异很大,PM10在1950万美元至33869万美元之间,PM2.5在1.963亿美元至22.096亿美元之间。
    我们的研究结果表明,决策者迫切需要制定干预措施,以实现拉丁美洲可持续的空气质量改善。符合世卫组织AQGs对拉丁美洲城市PM10和PM2.5的限值将大大有利于城市人口。
    UNASSIGNED: This study aims to estimate the short-term preventable mortality and associated economic costs of complying with the World Health Organization (WHO) air quality guidelines (AQGs) limit values for PM10 and PM2.5 in nine major Latin American cities.
    UNASSIGNED: We estimated city-specific PM-mortality associations using time-series regression models and calculated the attributable mortality fraction. Next, we used the value of statistical life to calculate the economic benefits of complying with the WHO AQGs limit values.
    UNASSIGNED: In most cities, PM concentrations exceeded the WHO AQGs limit values more than 90% of the days. PM10 was found to be associated with an average excess mortality of 1.88% with concentrations above WHO AQGs limit values, while for PM2.5 it was 1.05%. The associated annual economic costs varied widely, between US$ 19.5 million to 3,386.9 million for PM10, and US$ 196.3 million to 2,209.6 million for PM2.5.
    UNASSIGNED: Our findings suggest that there is an urgent need for policymakers to develop interventions to achieve sustainable air quality improvements in Latin America. Complying with the WHO AQGs limit values for PM10 and PM2.5 in Latin American cities would substantially benefits for urban populations.
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  • 文章类型: Journal Article
    背景:分析棕榈酸帕潘立酮治疗精神分裂症的经济效益。
    方法:我们根据《疾病和相关健康问题国际统计分类》收集了546例符合精神分裂症诊断标准的患者,《第10号》(ICD-10)。我们收集了一般人口数据,如性别,年龄,婚姻状况,和教育水平,然后开始用棕榈酸帕潘立酮治疗。然后在治疗开始后1、3、6、9和12个月进行随访评估,以评估临床疗效。不良反应,和注射剂量。我们还收集了12个月治疗前后的经济负担信息,以及过去一年的门诊次数和住院次数,以分析经济效益。
    结果:基线患者总计546例,其中239例在12个月后仍在接受帕潘立酮棕榈酸酯治疗。经过12个月的治疗,与以前相比,每年的门诊量增加(4(2,10)vs.12(4,12),Z=-5.949,P<0.001),而住院人数减少(1(1,3)vs.1(1,2),Z=5.625,P<0.001)。治疗12个月后患者的直接医疗费用中的住院费用与以前相比有所下降(5000(2000,12000)vs.3000(1000,8050),P<0.05),而门诊费用和直接非医疗费用没有显著变化(交通,住宿,膳食,和家庭陪同费用,等。)(P>0.05);治疗12个月后患者的间接成本(患者和家庭的生产力损失成本,由于破坏性行为造成的经济成本,寻求非医疗援助的成本)与以前相比有所下降(300(150,600)与150(100,200),P<0.05)。
    结论:棕榈酸酯减少了患者的住院次数,以及他们的直接和间接经济负担,具有良好的经济效益。
    BACKGROUND: To analyze the economic benefits of paliperidone palmitate in the treatment of schizophrenia.
    METHODS: We collected 546 patients who met the diagnostic criteria for schizophrenia according to the 《International Statistical Classification of Diseases and Related Health Problems,10th》(ICD-10). We gathered general population data such as gender, age, marital status, and education level, then initiated treatment with paliperidone palmitate. Then Follow-up evaluations were conducted at 1, 3, 6, 9, and 12 months after the start of treatment to assess clinical efficacy, adverse reactions, and injection doses. We also collected information on the economic burden before and after 12 months of treatment, as well as the number of outpatient visits and hospitalizations in the past year to analyze economic benefits.
    RESULTS: The baseline patients totaled 546, with 239 still receiving treatment with paliperidone palmitate 12 months later. After 12 months of treatment, the number of outpatient visits per year increased compared to before (4 (2,10) vs. 12 (4,12), Z=-5.949, P < 0.001), while the number of hospitalizations decreased (1 (1,3) vs. 1 (1,2), Z = 5.625, P < 0.001). The inpatient costs in the direct medical expenses of patients after 12 months of treatment decreased compared to before (5000(2000,12000) vs. 3000 (1000,8050), P < 0.05), while there was no significant change in outpatient expenses and direct non-medical expenses (transportation, accommodation, meal, and family accompanying expenses, etc.) (P > 0.05); the indirect costs of patients after 12 months of treatment (lost productivity costs for patients and families, economic costs due to destructive behavior, costs of seeking non-medical assistance) decreased compared to before (300(150,600) vs. 150(100,200), P < 0.05).
    CONCLUSIONS: Palmatine palmitate reduces the number of hospitalizations for patients, as well as their direct and indirect economic burdens, and has good economic benefits.
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  • 文章类型: Journal Article
    印度北部的城市,比如德里,面临严重的空气污染对公众健康的威胁。在2021年10月至2022年1月期间,德里79%的日平均PM2.5(空气动力学直径等于或小于2.5μm的颗粒物)值超过100μg/m3(根据印度标准,允许水平为60μg/m3)。为了应对这种急性暴露,使用呼吸面罩(RFM)是一种具有成本效益的解决方案,可以降低直接的健康风险,同时政策制定者制定长期排放控制计划。我们的研究重点是使用RFM来防止德里不同年龄组急性暴露于PM2.5污染的健康和经济效益。我们的研究结果表明,在50个选定的RFM中,M50具有防止短期超额死亡率的最大潜力(5-44岁范围内的908),其次是M49(745)和M48(568)。这些RFM产生了500.6(46%)的估计经济效益,411.1(37%),和313.4(29%)百万印度卢比(印度卢比),分别在2021-22年10月至1月期间。通过在空气质量差的情况下佩戴诸如M50,M49和M48之类的RFM,据估计,如果至少有30%的德里居民遵循由地球科学部开发的可运行的空气质量预警系统(AQEWS)发出的警报,则可以节省13%的短期超额死亡率和相关费用。我们的研究表明,在采取长期减排策略之前,RFM可以显着降低季风后和冬季PM2.5污染峰值的健康和经济负担。有人建议,可以与法定机构合作编写一份咨询文件,并应加以传播,以帮助弱势群体在冬季使用RFM。这项研究中提出的分析纯粹是基于科学的,研究结果绝不应被解释为对产品的认可。
    The cities of North India, such as Delhi, face a significant public health threat from severe air pollution. Between October 2021 and January 2022, 79 % of Delhi\'s daily average PM2.5 (Particulate matter with an aerodynamic diameter ≤ 2.5 μm) values exceeded 100 μg/m3 (the permissible level being 60 μg/m3 as per Indian standards). In response to this acute exposure, using Respiratory Face Masks (RFMs) is a cost-effective solution to reduce immediate health risks while policymakers develop long-term emission control plans. Our research focuses on the health and economic benefits of using RFMs to prevent acute exposure to PM2.5 pollution in Delhi for different age groups. Our findings indicate that, among the fifty chosen RFMs, M50 has greatest potential to prevent short-term excess mortality (908 in age ranges 5-44), followed by M49 (745) and M48 (568). These RFMs resulted in estimated economic benefits of 500.6 (46 %), 411.1 (37 %), and 313.4 (29 %) million Indian Rupee (INR), respectively during October-January 2021-22. By wearing RFMs such as M50, M49, and M48 during episodes of bad air quality, it is estimated that 13 % of short-term excess mortality and associated costs could be saved if at least 30 % of Delhi residents followed an alert issued by an operational Air Quality Early Warning System (AQEWS) developed by the Ministry of Earth Sciences. Our research suggests that RFMs can notably decrease health and economic burdens amid peak PM2.5 pollution in post-monsoon and winter seasons until long-term emission reduction strategies are adopted. It is suggested that an advisory may be crafted in collaboration with statutory bodies and should be disseminated to assist the vulnerable population in using RFMs during winter. The analysis presented in this research is purely science based and outcomes of study are in no way to be construed as endorsement of product.
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  • 文章类型: Journal Article
    这项研究有助于文献检查公众对美国碳捕集与封存(CCS)项目的接受程度。对影响公众对CCS项目支持的因素的研究为决策者提供了解决公众关切的见解,平衡CCS发展与公众情绪,并就最佳地点和时间做出明智的决定。根据对1850名受访者的全国代表性调查,研究发现,在美国,对CCS技术的熟悉程度很低(6.4%),对增加CCS开发的反对意见有限(11.5%)。回归结果表明,对美国增加的CCS项目的支持受到对技术和社会风险(泄漏和社区危险,分别),但不是生活成本风险,对环境和经济效益的看法,熟悉技术,对政府法规的信心,以及美国在CCS领域处于领先地位的愿望。我们找不到“不在我的后院”效果,和个人支持更多的CCS的发展在他们的国家也支持它在国家一级。了解这些因素有助于政策制定者预测实施CCS倡议的挑战,并允许制定解决关切的战略。
    This study contributes to the literature examining public acceptance of carbon capture and storage (CCS) projects in the US. The examination of factors that shape public support for CCS projects provides policymakers with insights to address public concerns, balance CCS development with public sentiments, and make informed decisions about optimal locations and timing. Based on a nationally representative survey on 1850 respondents, the study finds that in the US, there is very low familiarity (6.4%) regarding CCS technology and some limited opposition (11.5%) to increased CCS development. Regression results suggest that support for increased CCS projects in the US is influenced by perceptions of technical and social risks (leakage and community danger, respectively) but not cost of living risks, perceptions of environmental and economic benefits, familiarity with the technology, confidence in government regulations, and a desire for the US to lead in CCS. We fail to find the \'Not-in-My-Backyard\' effect, and individuals supporting the development of more CCS in their states also support it at a national level. Understanding these factors helps policymakers anticipate challenges in implementing CCS initiatives and allows for the development of strategies to address concerns.
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  • 文章类型: Journal Article
    通过大米消费接触甲基汞对汞污染地区的居民构成健康风险。例如中国西南部的万山汞矿区(WSMA)。利用WSMA公布的数据,这项研究建立了该地区2007年、2012年、2017年和2019年不同村庄的水稻甲基汞浓度数据库。人类甲基汞暴露的时间变化,对健康的影响,然后评估了不同生态修复措施下的经济效益。这项研究的结果表明,与WSMA的区域平均水平相比,2019年的大米甲基汞浓度降低了3.88μg/kg,可能的每日甲基汞摄入量相应降低了0.039μg/kg/d。该地区的生态修复措施在2007-2022年期间累计产生了3870万美元的经济效益,其中84%来自污染源处理,16%来自种植结构调整。然而,2016年的洪水事件造成了243万美元的经济损失(占地区国内生产总值的0.38%)。种植结构调整在短期内产生最大的经济效益,而污染源处理在长期内最大限度地提高了经济效益,并防止了洪水事件的扰动。这些发现证明了生态修复措施在汞污染地区的重要性,并为人类通过大米消费暴露汞的风险评估奠定了基础。
    Methylmercury (MeHg) exposure via rice consumption poses health risk to residents in mercury contaminated areas, such as the Wanshan Hg mining area (WSMA) in southwest China. Making use of the published data for WSMA, this study developed a database of rice MeHg concentrations for different villages in this region for the years of 2007, 2012, 2017, and 2019. The temporal changes of human MeHg exposure, health effects, and economic benefits under different ecological remediation measures were then assessed. Results from this study revealed a decrease of 3.88 μg/kg in rice MeHg concentration and a corresponding reduction of 0.039 μg/kg/d in probable daily intake of MeHg in 2019 compared to 2007 on regional average in the WSMA. Ecological remediation measures in this region resulted in the accumulated economic benefits of $38.7 million during 2007-2022, of which 84 % was from pollution source treatment and 16 % from planting structure adjustment. However, a flooding event in 2016 led to an economic loss of $2.43 million (0.38 % of regional total Gross Domestic Product). Planting structure adjustment generates the greatest economic benefits in the short term, whereas pollution source treatment maximizes economic benefits in the long term and prevents the perturbations from flooding event. These findings demonstrate the importance of ecological remediation measures in Hg polluted areas and provide the foundation for risk assessment of human MeHg exposure via rice consumption.
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  • 文章类型: Journal Article
    在经济林生产中,有常见的问题,如过度施用水和肥料,多余的植物生长,经济效益低。合理的水肥管理不仅有助于解决这些问题,而且可以提高植物对水肥资源的吸收和利用效率,促进果林产业绿色高效发展。为探索适宜枸杞水氮管理的模式,本研究于2021年至2022年进行了现场实验。具体来说,四种灌溉模式(根据土壤水分含量与田间水分容量的比例θf,45-55%θf(W1,严重缺水),55-65%θf(W2,中度缺水),65-75%θf(W3,轻度缺水),和75-85%θf(W4,充分灌溉)和四个氮素施用水平(0kg·ha-1(N0,无氮施用),150kg·ha-1(N1,低氮水平),300kg·ha-1(N2,中等施氮水平),并设置450kg·ha-1(N3,高氮施用水平))来分析水氮控制对株高的影响,阀杆直径,叶绿素含量,光合特性和产量,枸杞+苜蓿系统中枸杞的经济效益。研究结果表明,枸杞的株高和茎径增量随着灌水量的增加而增加,随着施氮量的增加先增加后减少。同时,枸杞的叶绿素含量在整个生长期不断增加,在所有生长期中,用W4N2处理的枸杞的叶绿素含量最高。在枸杞+苜蓿系统中,枸杞净光合速率的日变化曲线呈单峰型,在W4N2处理的植物中出现每日平均净光合速率和每日羧化速率的最大值(19.56μmol·m-2·s-1和157.06mmol·m-2·s-1)。同时,枸杞植株的蒸腾速率随着缺水程度的增加和施氮水平的降低而不断降低。W1N2处理的植物表现出最高的叶片日平均水分利用效率(3.31μmol·s-1),与其他处理下的植物相比,效率提高了0.50-10.47%。水氮耦合显著提高了枸杞植株的产量和经济效益,W4N2处理和W3N2处理的植物表现出最高的干果产量(2623.07kg·ha-1)和净收入(50,700CNY·ha-1),分别。此外,与其他治疗方法相比,这两种处理方法(W4N2和W3N2)的干果产量和净收入指标分别提高了4.04-84.08%和3.89-123.35%,分别。回归分析表明,在枸杞+苜蓿系统中,使用4367.33-4415.07m3·ha-1的灌溉量和339.80-367.35kg·ha-1的施氮量,可以实现枸杞植物的高产和经济效益。本研究可为提高甘肃引黄灌区枸杞植株的生产力,实现枸杞+苜蓿系统水、氮的合理供应提供参考,中国,和其他类似的生态区。
    In the production of economic forests, there are common issues such as excessive application of water and fertilizer, redundant plant growth, and low economic benefits. Reasonable water and fertilizer management can not only help address these problems but also improve the absorption and use efficiency of water and fertilizer resources by plants, promoting the green and efficient development of the fruit and forestry industry. In order to explore a suitable water and nitrogen management mode for Lycium barbarum, field experiments were conducted in this study from 2021 to 2022. Specifically, four irrigation modes (according to the proportion ratio of soil moisture content to field moisture capacity θf, 45-55% θf (W1, severe water deficiency), 55-65% θf (W2, moderate water deficiency), 65-75% θf (W3, mild water deficiency), and 75-85% θf (W4, sufficient irrigation)) and four nitrogen application levels (0 kg·ha-1 (N0, no nitrogen application), 150 kg·ha-1 (N1, low nitrogen application level), 300 kg·ha-1 (N2, medium nitrogen application level), and 450 kg·ha-1 (N3, high nitrogen application level)) were set up to analyze the influences of water and nitrogen control on the plant height, stem diameter, chlorophyll content, photosynthetic characteristics and yield, and economic benefits of Lycium barbarum in the Lycium barbarum + Alfalfa system. The study results show that the plant height and stem diameter increment of Lycium barbarum increase with the irrigation amount, increasing first and then decreasing with the increase in the nitrogen application level. Meanwhile, the chlorophyll contents in Lycium barbarum continuously increase throughout their growth periods, with Lycium barbarum treated with W4N2 during all growth periods presenting the highest contents of chlorophyll. In a Lycium barbarum + Alfalfa system, the daily variation curve of the Lycium barbarum net photosynthetic rate presents a unimodal pattern, with maximum values of the daily average net photosynthetic rate and daily carboxylation rate appearing among W4N2-treated plants (19.56 μmol·m-2·s-1 and 157.06 mmol·m-2·s-1). Meanwhile, the transpiration rates of Lycium barbarum plants continuously decrease with the increased degree of water deficiency and decreased nitrogen application level. W1N2-treated plants exhibit the highest leaf daily average water use efficiency (3.31 μmol·s-1), presenting an increase of 0.50-10.47% in efficiency compared with plants under other treatments. The coupling of water and nitrogen has significantly improved the yields and economic benefits of Lycium barbarum plants, with W4N2-treated and W3N2-treated plants presenting the highest dried fruit yield (2623.07 kg·ha-1) and net income (50,700 CNY·ha-1), respectively. Furthermore, compared with other treatment methods, these two treatment methods (W4N2 and W3N2) exhibit increases of 4.04-84.08% and 3.89-123.35% in dried fruit yield and net income indexes, respectively. Regression analysis shows that, in a Lycium barbarum + Alfalfa system, both high yields and economic benefits of Lycium barbarum plants can be achieved using an irrigation amount of 4367.33-4415.07 m3·ha-1 and a nitrogen application level of 339.80-367.35 kg·ha-1. This study can provide a reference for improving the productivity of Lycium barbarum plants and achieving a rational supply of water and nitrogen in Lyciun barbarum + Alfalfa systems in the Yellow River Irrigation Area of Gansu, China, and other similar ecological areas.
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