PDF(Pubmed)
Abstract：
The rapid restoration and renewal of the moso bamboo logging zone after strip logging has emerged as a key research area, particularly regarding whether nutrient accumulation and utilization in reserve zones can aid in the restoration and regeneration of the logging zone. In this study, a dynamic 15N isotope tracking experiment was conducted by injecting labeled urea fertilizer into bamboo culms. Logging zones and reserve zones of 6 m, 8 m, and 10 m widths were established. The conventional selective logging treatment served as a control (Con). Measurements were taken in May and October to assess the differences in nitrogen accumulation ability, utilization rates, and nutrient content across different organs in bamboo forests at different growth stages and under different treatments. Principal component analysis was conducted to evaluate and determine the importance of each indicator and strip logging treatment comprehensively. The results showed that various bamboo organs exhibited higher nitrogen accumulation and utilization rates during the peak growth period compared to the late growth period. Leaves had the highest nitrogen accumulation and utilization rates than the other organs. The average C content in various bamboo organs under different logging treatments exhibited subtle differences, irrespective of variation in logging width treatments. Bamboo culm exhibited the highest carbon accumulation. The C content in various bamboo organs was higher during the peak growth period than in the late growth period. The nitrogen content peaked in the leaves during the two growth stages and was significantly higher compared to the other organs. Most bamboo organs in the logging zones exhibited relatively higher nitrogen content than in the reserve zone and Con group. The P content was highest in bamboo leaves compared with other organs across the different strip logging treatments. Principal component analysis revealed relatively high absolute values of the coefficients for the C content, bamboo stump C content, and culm Ndff%. Log8 and Res10 zones had the highest comprehensive evaluation scores, indicating that Log8 and Res10 had the best effect on the promotion of nitrogen utilization and nutrient accumulation in various organs of moso bamboo.
摘要：
条伐后毛竹采伐带的快速恢复和更新已成为重点研究领域,特别是关于保护区的养分积累和利用是否有助于伐木区的恢复和再生。在这项研究中,通过将标记的尿素肥料注入竹秆中，进行了动态15N同位素跟踪实验。6m的测井带和保留区,8米,并建立了10米的宽度。传统的选择性测井处理用作对照(Con)。在5月和10月进行了测量，以评估氮积累能力的差异，利用率，竹林不同生长阶段和不同处理下不同器官的养分含量。进行主成分分析,综合评价和确定各指标的重要性,并进行条带测井处理。结果表明，与生长后期相比，在生长高峰期，各种竹子器官表现出更高的氮积累和利用率。叶片的氮素积累和利用率高于其他器官。不同采伐处理下竹子各器官中的平均C含量表现出细微的差异，与测井宽度处理的变化无关。竹秆的碳积累量最高。生长高峰期竹子各器官中的C含量高于生长后期。在两个生长阶段，叶片中的氮含量达到峰值，并且明显高于其他器官。伐木区的大多数竹子器官的氮含量均高于保护区和Con组。在不同的采伐处理中，与其他器官相比，竹叶中的P含量最高。主成分分析显示，C含量系数的绝对值相对较高，竹桩C含量,和culmNdff%。Log8和Res10区的综合评价得分最高,说明Log8和Res10对毛竹各器官氮素利用和养分积累的促进作用最好。
