摘要
选取京津风沙源区的3种典型植被作为研究对象,通过对1998—2007年生长季(5—10月)期间植被盖度距平百分率与不同时间尺度的标准化降雨指数(standard precipitation index,SPI)之间Pearson相关关系的计算,来研究研究区植被变化对降水的响应规律.主要研究结果表明:研究区内不同土地利用类型的植被对降水的响应规律不同,在生长季的不同时期对降水的响应规律也有所不同.总的来说,植被生长对3个月尺度的自然降水条件存在明显的响应规律,特别是对于研究区持续处于干旱或湿润的状态时,植被对前期降水的响应十分明显,而在干湿波动较快或干湿过渡期,植被则对前期降水的响应不很明显.
Responses of three typical vegetations to precipitation in growth seasons from 1998 to 2007 were investigated in Beijing-Tianjin sand sources region based on Pearson＇s correlations between percentage of fractional vegetation coverage（PVC） and different timescales of standardized precipitation index（SPI）.Data show that vegetations of different land cover responded to precipitation inconsistently,the response also varied with different period of growth season.Generally,a 3-month SPI was found to have the best correlation with PVC.In particular,after long-lasting drought or wet events,vegetation responded to pre-precipitation strongly.However,after a transition period,responses were not readily seen.
出处
《北京师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期610-618,共9页
Journal of Beijing Normal University(Natural Science)
基金
国家自然科学基金资助项目(NSFC40601091)
国家科技支撑计划资助项目(2006BAC18B06)
