河南省近20年土壤湿度的时空变化特征分析  

Analysis on the temporal and spatial feature of soil moisture variation of He'nan Province in recent 20 years

作　　者：李树岩[1] 陈怀亮[1] 方文松[1] 赵国强[1] 

机构地区：[1]河南省气象科学研究所,河南郑州450003

出　　处：《干旱地区农业研究》2007年第6期10-15,共6页Agricultural Research in the Arid Areas

基　　金：中国气象局预测减灾应用技术开发推广项目"农业气象试验站生态环境监测和信息服务试验示范"

摘　　要：利用自然正交函数(EOF)分解、相关分析、趋势倾向率分析等方法,对河南省近20 a土壤湿度的时空变化特征进行了分析。通过建立土壤湿度同温度、降水的多元回归方程,来量化土壤湿度同温度、降水的关系。分析表明:土壤湿度的空间分布有比较明显的差异,总体上由南向东北和西北两个方向逐渐降低;土壤湿度的年际变化有不太显著的下降趋势;年内不同季节土壤湿度有不同的变化趋势,其中春季土壤湿度小,夏季开始升高,进入秋冬逐步保持在较高水平。土壤湿度与降水成显著的正相关,同温度成显著的负相关。各季节影响土壤湿度变化的主要因子为:春季受温度回升影响而降低;夏季随降水增多而增大;秋季继续缓慢上升,主要由降水的缓慢累积所造成;冬季由于温度低,土壤湿度变化不大。In terms of EOF, correlation and tendency analysis methods, the temporal and spatial feature of soil moisture of He＇ nan Province in recent 20 years were analyzed. By establishing multiple regression equations between soil moisture and temperature and precipitation, the relation between soil moisture and the two factors was quantized. The results reveal that, the spatial distribution of soil moisture has obvious diversity. It decrease gradually from south to northeast and northwest in general. The annual variability of soil moisture has an unobvious down tendency, while there are different variable tendencies among different seasons in a year. The soil moisture in spring was small, but there is an increasing tendency in summer. Also it keeps a high- level in autumn and winter. The soil moisture has a negative correlation with temperature significantly, and a significant positive correlation with precipitation. In seasons the major factors that influence the variability of soil moisture are： In spring the soil moisture decreased due to temperature upswing; In summer it increased with the increasing amount of precipitation; Because of rainfall cumulated tardily, soil moisture raised slowly in autumn. In winter the variety of soil moisture was not obviously mainly because the temperature was low.

关 键 词：土壤湿度 20年时空变化 河南省 

分 类 号：S162.3[农业科学—农业气象学]