摘要
干热河谷是一类特殊的退化生态系统区域，降水对河谷景观格局的变化起着十分重要的作用。基于消除趋势波动分析法（DFA）分析了元谋地区近50a降雨量变化趋势，同时也对1978～2006年进行了滑移分析。结果表明，元谋地区年均降水量序列至少在50a的时间尺度上具有微弱的Hurst效应，即具有较弱的长期持续性及较强的随机性。区域植被覆盖率的变化能对该区域降雨量的动力学变化趋势做出有效的解释。
The dry-hot valley is a special kind of degradation ecosystem region; the precipitation is a key factor to its landscape change. Based on the method of Detrended Fluctuation Analysis （DFA） , the authors analyzed the variation trends of precipitation time series in Yuanmou Dry-hot Basin over the last 50 years. At the same time, the DFA exponent spectra of moving series from 1978 to 2006 were analyzed. The results shows that precipitation time series in Yuanmou Dry-hot Basin,which has obvious Hurst effect, has relative weak persistence and relative strong randomness. Vegetation coverage change in the dry-hot valley can explain the temporal evolution dynamics of precipitation shown by the DFA exponent spectra of moving series from 1978 to 2006 in Yuanmou Dry-hot Basin.
出处
《山地学报》
CSCD
北大核心
2008年第5期553-559,共7页
Mountain Research
基金
国家支撑计划项目(2006BAC01A11)
国家重点基础研究发展计划(973)项目(2007CB407206)~~
关键词
消除趋势波动分析法
干热河谷
降雨量
植被覆盖率
： Detrended fluctuation analysis
Dry-hot basin
precipitation
vegetation coverage
