综合稻蛙生态系统(IRFE)具有减少甲烷(CH4)排放并维持稻田产量的潜力。然而,水稻形态性状与CH4排放之间的数量关系有待探索。在这项研究中,进行了为期2年的田间试验,以评估IRFE对水稻形态性状和稻田CH4排放的影响以及生态机制。本研究分析了12个地上和8个地下水稻形态性状,水稻产量,以及具有六个青蛙密度(0、3750、7500、15,000、30,000和60,000青蛙ha-1)的稻田的CH4通量和排放。结果表明,IRFE在2018年和2019年水稻生长季减少了24.70%-41.75%和21.68%-51.21%,分别。此外,CH4的排放随青蛙数量的增加而减少。青蛙也增加了直径,生物量,和水稻根的体积,从而促进水稻生长。根生物量,千粒重,收获指数也与产量密切相关。根孔隙率和氧分泌能力与CH4通量呈负相关。青蛙增加了根的孔隙度和氧的分泌,从而减少CH4排放。本研究表明,通过改变IRFE中的水稻形态性状,可以同时减少CH4排放和提高水稻产量。
Integrated Rice-frog Ecosystem (IRFE) has the potential to reduce methane (CH4) emission and maintain yields from paddy fields. However, the quantitative relationship between rice morphological traits and CH4 emission remains to be explored. In this study, a 2-year field experiment was conducted to evaluate the effect of IRFE on rice morphological traits and CH4 emission from paddy fields and the ecological mechanisms. This study was conducted to analyze twelve aboveground and eight underground rice morphological traits, rice yields, and CH4 flux and emission from the paddy fields with six frog densities (0, 3750, 7500, 15,000, 30,000, and 60,000
frogs ha-1). The results showed that IRFE reduced CH4 emission by 24.70%-41.75% and 21.68%-51.21% in the 2018 and 2019 rice growth seasons, respectively. Moreover, CH4 emission decreased with the increase of
frogs.
Frogs also increased the diameter, biomass, and volume of rice roots, thus promoting rice growth. Root biomass, thousand-grain weight, and harvest index were also closely related to the yield. Root porosity and oxygen secretion capacity were negatively correlated with CH4 flux.
Frogs increased root porosity and oxygen secretion, thereby reducing CH4 emission. The present study demonstrated that reducing CH4 emission and improving rice yields could be simultaneously achieved by altering rice morphological traits in IRFE.