退化程度对典型草原物种多样性和土壤养分 关系的影响

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中图分类号：S812.6 文献标识码：A 文章编号：1007-0435（2025）09-2890-10

Effects of Degradation Stages on the Relationship Between Species Diversity and Soil Nutrients in Typical Steppe

DUAN Jun-guang1，FANG Kai1，CHU Jian-min1，2*，WANG Ying-xin³， ZHANG Qi1

（1.ResearchepteetAcademyofFestryegorgliaha;eseachstiuteofoloicalosetiodestoratie Academy ofForestry，Beijing 10oo91，China）

Abstract：Grassland degradation significantly impedes the sustainable development of grassland ecosystem. Investigating the interelationship between plant diversityand soil nutrients acrossdiffrent stages ofdegradation at alarge spatial scale，is crucial for the efective restoration of degraded grassland ecosystem.Our study tar geted three typical steppes in Xilin Gol with diferent degrees of degradation （Slight，moderate，and severe）. Through field surveys and measurements of plant species diversity and soil nutrient characteristics，our study aimed to analyze the interrelationships between these two factors across degradation stages.Our results indicated that as degradation intensifies，the abundance of annual and biennial herbaceous species increased，while that of perennial herbaceous species decreased，resulting in changes to the plant community structure.Species diversity peaked atthe moderate degradation stage，while overall soil nutrient levels were thelowest in severely degraded grassands. Corelation matrix analysis revealed that as degradation progresses，the primary limiting soil nutrient factor shifted from nitrogen to phosphorus.The relationship between plant species diversity and soil nutrients transitioned from a positive toa significant negative correlation，and the consistency between plant diversity and soil nutrient changed diminishes.These findings suggest that，in the restoration of degraded grasslands，it is essential to place greater emphasis on the vegetation-soil relationship. Strengthening comprehensive monitoring of ecosystem structure and function willprovide a theoretical basis for the development of scientifically grounded grassland restoration and management strategies.

Key words： Typical steppe;Grassland degradation;Species diversity;Soil nutrients;Redundancy analysis

近年来，生态系统服务功能的保护与恢复成为研究的焦点，其中生物多样性与生态系统功能之间的关系备受关注[1-2]。（剩余16881字）