干旱区研究2024，Vol.41Issue(11)：1875-1886,12.DOI:10.13866/j.azr.2024.11.08
沙化草地恢复中小叶锦鸡儿对植被和土壤的影响
Effects of Caragana microphylla on vegetation and soil in the restoration of desertified grasslands
摘要
Abstract
Caragana microphylla,a shrub species commonly used to promote vegetation recovery in grasslands affected by desertification,plays a significant role in the ecological restoration and sustainable development of sandy lands.Understanding its impact on understory vegetation and soil physicochemical characteristics during different stages of desertified grassland recovery is crucial.This study focuses on C.microphylla shrublands in three typical stages of desertified grassland vegetation recovery in the Hulun Buir sandy land:semi-fixed,fixed,and sandy grasslands.This study used ANOVA,Pearson's correlation analysis,and redundancy analysis methods to explore the changes in understory plant communities and soil physicochemical characteristics in C.microphyl-la shrublands during different stages of desertified grassland vegetation recovery and their interrelationships.The results indicate that,as the degree of vegetation recovery in desertified grasslands increases,the species richness of the understory vegetation,Shannon-Wiener index,community height,and biomass also increase.The commu-nity height and biomass within the shrublands are higher than outside,with species richness within the shrublands being higher than outside during the semi-fixed and fixed sandland stages.In the 0-10 cm and 10-20 cm soil lay-ers,SWC displays an increasing trend,peaking in the sandy grassland stage(1.2%),and is higher within the shrublands than outside.The SWC at 10-20 cm is higher at 0-10 cm.In both layers,clay and silt content gradual-ly increases with the degree of vegetation recovery in the sandy land and is higher within the shrublands than out-side,while the opposite is true for sand content.In both soil layers,SOC gradually increases with the degree of vegetation recovery,peaking in the sandy grassland stage(4.12 g·kg-1)and is higher within the shrublands than outside.TN increases from the semi-fixed to the fixed sand land stage,with higher levels within the shrublands than outside at all stages.Soil pH within the shrublands decreases as the degree of vegetation recovery increases.No significant change in TP is observed.Additionally,soil physicochemical characteristics account for 59.6%and 46.9%of the vegetation changes in both soil layers within and outside the shrublands,respectively,with the main influencing factors being soil particle size,TN,SWC,and SOC.This study demonstrates that during vegetation recovery in desertified grasslands,C.microphylla shrublands promote vegetation growth and development by im-proving the soil physicochemical characteristics under the shrublands,including soil particle size,SWC,SOC,and TN.关键词
沙化草地植被恢复/小叶锦鸡儿/植被特征/土壤理化特征/呼伦贝尔Key words
desertified grassland vegetation recovery/Caragana microphylla/vegetation characteristics/soil physicochemical characteristics/Hulun Buir引用本文复制引用
朱甜甜,海鹭,曹文旭,李旭,李清河..沙化草地恢复中小叶锦鸡儿对植被和土壤的影响[J].干旱区研究,2024,41(11):1875-1886,12.基金项目
国家自然科学基金项目(31470622)和国家重点研发计划项目(2016YFC05009083)资助 （31470622）
