草业学报2016，Vol.25Issue(5)：21-29,9.DOI:10.11686/cyxb2015334
围封对内蒙古典型草原群落特征及土壤性状的影响
Effects of fencing on vegetation community characteristics and soil properties of a typical steppe in Inner Mongolia
摘要
Abstract
Fencing is one of the important means of restoration and reconstruction of degraded grassland,and has been widely used in grassland ecological restoration programs in China.This study monitored fenced and free-grazed grassland plots,to evaluate the impacts of fencing on community plant species composition,compo-sition of functional groups,species diversity,aboveground biomass,soil organic carbon (C)and total nitrogen (N)contents of degraded grassland.The plant species number in fenced plots (22 species)was greater than that in free-grazed plots (17 species).Community diversity (H ),richness (Pa ),evenness (J P )indices and aboveground biomass did not differ significantly between fenced and free-grazed plots (P >0.05).Importance <br> value (IV),percentage,aboveground biomass,H ,Pa and J P indices of shrubs,semi-shrubs (SS)and peren-nial forbs (PF)in fenced plots were higher than those in free-grazed plots (P <0.05).Aboveground biomass of perennial grasses (PG)was higher in fenced plots than in free-grazed plots (P <0.05).Importance value (IV), percentage,aboveground biomass,H ,Pa and J P indices of annual or biennial herbs (AB)were lower in fenced plots than in free-grazed plots (P <0.05).The percentage and aboveground biomass of ecological func-tional groups did not differ significantly between fenced plots and free-grazed plots (P >0.05).Soil organic C and total N content were not significantly different between fenced plots and free-grazed plots (P >0.05).The soil organic C and total N contents decreased significantly (P <0.05)with increasing soil depth,but the rate of decrease with depth was less in fenced plots than in free-grazed plots.关键词
围封/自由放牧/物种组成/功能群特征/物种多样性/土壤有机碳/土壤全氮Key words
fencing/free-grazing/plant species composition/functional groups characteristics/species diversi-ty/soil organic carbon/soil total nitrogen引用本文复制引用
杨勇,刘爱军,李兰花,陈海军,宋向阳,王保林,罗冬,王明玖..围封对内蒙古典型草原群落特征及土壤性状的影响[J].草业学报,2016,25(5):21-29,9.基金项目
内蒙古自治区科技重大专项“不同生态类型区域生态评估及风险预测技术研究”和内蒙古自治区科技计划项目（2060402）资助。 （）
