[高山草甸重度退化阶段土壤碳、氮、磷生态平衡的特征和驱动因素]。

Q2 Environmental Science
Yu-Ping Wu, Ming-Jun Ding, Hua Zhang, Yue-Ju Zhang, Huan Xu, Peng Huang
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引用次数: 0

摘要

深入了解土壤养分状况和平衡关系有助于高寒退化草地的有效恢复和管理。为研究草甸重度退化期土壤碳、氮、磷养分的平衡关系,采用野外取样调查、室内分析和数理统计等方法,探讨了三江源地区高寒草甸重度退化期土壤碳、氮、磷含量、储量和生态平衡变化的特征和驱动因素。结果表明,在重度退化阶段,杂草植物占绝对优势,土壤C∶N∶P约为32.83∶3.87∶0.67,存在一定的氮限制。土壤碳、氮、磷含量的变异系数依次为:有机碳(1.09)总氮(0.63)总磷(0.29)。随着草地退化指数(GDI)的增加,有机碳含量和碳氮比呈显著的线性下降趋势,而总磷含量和有机碳储量呈显著的非线性变化,其中总磷含量呈显著的平缓 "U "型分布,有机碳储量在重度退化初期下降较为平缓,当 GDI 为 57.9 时急剧下降。曼特尔相关分析结果表明,土壤碳氮比、碳磷比、氮磷比与有机碳含量和储量、总氮储量呈显著相关。结构方程模型的结果表明,土壤含水量既有直接影响,也有通过植被因子、土壤碳、氮、磷生态化学计量学比的间接影响,土壤含水量和植被因子(高度、覆盖度和生物量)是影响土壤生态化学计量学比的关键环境因子。是影响土壤生态平衡的关键环境因子。研究结果可为高寒草甸严重退化草地的恢复提供科学依据和实践指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Characteristics and Drivers of Soil Carbon, Nitrogen, and Phosphorus Ecological Stoichiometry at the Heavy Degradation Stage of the Alpine Meadow].

An in-depth understanding of the soil nutrient status and balance relationship can help the effective recovery and management of alpine degraded meadows. In order to study the balance relationship among soil carbon, nitrogen, and phosphorus nutrients during the heavy degradation stage of meadows, field sampling and investigation, indoor analysis, and mathematical statistics were used to explore the characteristics and driving factors of changes in soil carbon, nitrogen, and phosphorus content, storage, and ecological stoichiometry during the heavy degradation stage of alpine meadows in the Sanjiangyuan region. The results showed that in the heavy degradation stage, miscellaneous grass plants occupied absolute dominance, soil C∶N∶P was approximately 32.83∶3.87∶0.67, and there was certain nitrogen limitation. The coefficients of variation of soil carbon, nitrogen, and phosphorus content were in the following order: organic carbon (1.09) > total nitrogen (0.63) > total phosphorus (0.29). The organic carbon content and the carbon and nitrogen ratio showed a significant linear decreasing trend with the increase in the grassland degradation index (GDI), while the total phosphorus content and organic carbon storage showed a significant non-linear change, in which the total phosphorus content showed a significant gentle U-shaped distribution, and the organic carbon storage decreased more gently at the beginning of the heavy degradation stage and then decreased sharply when the GDI was 57.9. The results of Mantel correlation analysis showed that the soil carbon to nitrogen ratio, carbon to phosphorus ratio, and nitrogen to phosphorus ratio showed significant correlation with organic carbon content and storage and total nitrogen storage. The results of structural equation modeling indicated that soil water content had direct effects as well as indirect through vegetation factors, soil carbon, nitrogen, and phosphorus ecological stoichiometry ratios, and soil water content and vegetation factors (height, cover, and biomass) were key environmental factors affecting soil ecological stoichiometry. The research results can provide scientific basis and practical guidance for the restoration of heavily degraded grassland in alpine meadows.

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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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