辽宁省土壤水分的时空变化格局分析

文章利用基于微波遥感的土壤水分产品评价辽宁省近40年(1979~2015)来干旱事件的时空变化特征。研究结果表明:辽宁省地表土壤水分呈现东高西低的空间分布;采用了一种具有时-频多分辨功能的小波分析(Wavelet Analysis)来更好地研究土壤水分时间序列变化规律,发现辽宁省年平均土壤水分随着时间具有波动降低趋势,并伴随有10年和20年左右的两个主要周期;从季节上看,四个季节的土壤水分时间序列变化十分剧烈,春夏两季土壤水分呈现出增加趋势,秋冬两季的土壤水分呈现出降低趋势。

An Analysis of Spatial and Temporal Changes of Soil Moisture Content in Liaoning Province

In this article, soil moisture products based on microwave remote sensing are used for evaluation of the spatial and temporal change characteristics of drought events in Liaoning Province over the past 40 years (from 1979 to 2015). The research results show that a spatial distribution of surface soil moisture content in Liaoning Province presents high in the east but low in the west. Wavelet analysis with multi-resolution time-frequency functions is applied to conduct a better research of time-series change law of soil moisture content. It is found that over time, a reduced fluctuation exists in the average annual soil moisture content in Liaoning Province, with two primary cycles of about 10 years and 20 years. From the perspective of seasons, the soil moisture content in four seasons has a dramatic change in time series, with increasing tendency in spring and summer but decreasing tendency in autumn and winter.