草业学报2016，Vol.25Issue(10)：31-39,9.DOI:10.11686/cyxb2016175
黄土丘陵区不同退耕年限草地群落特征及其土壤水分养分效应
Relationships between community characteristics and soil nutrients and moisture in abandoned hill country grassland
摘要
Abstract
Using comparative analysis and substituting temporal serial with spatial serial data,we analyzed data collected from abandoned farmland with eight different vegetation restoration periods (1-35 years).The inter-action between vegetation regeneration,soil moisture and soil nutrients as the vegetation restoration period changed was also investigated.Results;1)During 35 years of natural restoration the number of species present fluctuated,initially decreasing,increasing and decreasing again.The Margalef richness index and Shannon-Wiener index firstly increased,then decreased,and then increased again.However,the Pielou evenness index showed the opposite trend.2)With increasing restoration period,aboveground biomass and underground bio-mass were both significantly positively correlated with restoration duration.3 )As restoration duration in-creased,soil moisture and soil fertility (except available phosphorus)in different soil layers initially declined and then increased.Available phosphorus decreased.Soil moisture of 20-50 cm,50-80 cm,80-100 cm ini-tially declined and then increased;the opposite pattern was observed in the 20cm soil layer.4)During the res-toration process,indices of vegetation traits (except the Pielou index)were significantly positive correlated with soil nutrient content including soil organic matter,nitrogen and phosphorus.关键词
黄土丘陵区/退耕年限/植物生物量/土壤水分/土壤养分Key words
hilly-gully region/abandoned years/biomass/soil moisture/soil nutrients引用本文复制引用
刘海威,张少康,焦峰..黄土丘陵区不同退耕年限草地群落特征及其土壤水分养分效应[J].草业学报,2016,25(10):31-39,9.基金项目
国家自然科学基金项目（41271043，31370455）和中国科学院知识创新工程“百人计划”项目资助。 （）
