Leguminosae plants play a key role in affecting soil physical-chemical and biological properties during grassland succession after farmland abandonment in the Loess Plateau,China  

作　　者：SUN Lin YU Zhouchang TIAN Xingfang ZHANG Ying SHI Jiayi FU Rong LIANG Yujie ZHANG Wei 

机构地区：[1]College of Grassland Agriculture,Northwest A&F University,Yangling 712100,China

出　　处：《Journal of Arid Land》2023年第9期1107-1128,共22页干旱区科学（英文版）

基　　金：supported by the Forestry Science and Technology Innovation Project of Shaanxi Province,China(SKLK2022-02-14);the Shaanxi Province Key Research and Development Program(2022SF-285);the China Postdoctoral Science Foundation(2020M683594).

摘　　要：Leguminosae are an important part of terrestrial ecosystems and play a key role in promoting soil nutrient cycling and improving soil properties.However,plant composition and species diversity change rapidly during the process of succession,the effect of leguminosae on soil physical-chemical and biological properties is still unclear.This study investigated the changes in the composition of plant community,vegetation characteristics,soil physical-chemical properties,and soil biological properties on five former farmlands in China,which had been abandoned for 0,5,10,18,and 30 a.Results showed that,with successional time,plant community developed from annual plants to perennial plants,the importance of Leguminosae and Asteraceae significantly increased and decreased,respectively,and the importance of grass increased and then decreased,having a maximum value after 5 a of abandonment.Plant diversity indices increased with successional time,and vegetation coverage and above-and below-ground biomass increased significantly with successional time after 5 a of abandonment.Compared with farmland,30 a of abandonment significantly increased soil nutrient content,but total and available phosphorus decreased with successional time.Changes in plant community composition and vegetation characteristics not only change soil properties and improve soil physical-chemical properties,but also regulate soil biological activity,thus affecting soil nutrient cycling.Among these,Leguminosae have the greatest influence on soil properties,and their importance values and community composition are significantly correlated with soil properties.Therefore,this research provides more scientific guidance for selecting plant species to stabilize soil ecosystem of farmland to grassland in the Loess Plateau,China.

关 键 词：secondary succession LEGUMINOSAE plant diversity plant community composition soil physical-chemical properties soil biological properties 

分 类 号：S812[农业科学—草业科学]