Effect of rainfall interannual variability on the biomass and soil water distribution in a semiarid shrub community  

作　　者：LIU JunShanXU XiaZHANG Yong,TIAN YuQiang & GAO Qiong State Key Laboratory of Earth Surface Processes and Resource Ecology,College of Resources Science & Technology,Beijing Normal University,Beijing 100875,China 

出　　处：《Science China(Life Sciences)》2010年第6期729-737,共9页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 30590384, 40671071 and 30900197)

摘　　要：The dynamics of biomass and soil moisture in semiarid land is driven by both the current rainfall and the ecosystem memory.Based on a meta-analysis of existing experiments,an ecosystem model was used to calculate the effect of the rainfall interannual variability on the pattern of biomass and soil moisture in a shrub community.It was found that rainfall interannual variability enabled shrubs to be more competitive than grasses,and to maintain the dominant role over a longer time.The rainfall interannual variability resulted in complex soil moisture dynamics.The soil water recharge in wet years alternated with discharge in drought years.The dynamics of biomass and soil moisture in semiarid land is driven by both the current rainfall and the ecosystem memory.Based on a meta-analysis of existing experiments,an ecosystem model was used to calculate the effect of the rainfall interannual variability on the pattern of biomass and soil moisture in a shrub community.It was found that rainfall interannual variability enabled shrubs to be more competitive than grasses,and to maintain the dominant role over a longer time.The rainfall interannual variability resulted in complex soil moisture dynamics.The soil water recharge in wet years alternated with discharge in drought years.

关 键 词：RAINFALL SHRUB community ARTEMISIA ORDOSICA ecosystem model ECOHYDROLOGY 

分 类 号：Q948[生物学—植物学] P426.614[天文地球—大气科学及气象学]