中国耕地土壤相对湿度时空分异

doi:10.11821/dlxb201901009

Abstract

Abstract:

Based on the data of relative soil moisture obtained from 653 agricultural meteorological stations in China during the period of 1993-2013, the spatial and temporal differentiations of relative soil moisture in China's farmland were analyzed and discussed by using geostatistical methods. The results show that the relative soil moisture of China's farmland has fluctuated and increased since 1993, exceeding 60% in general. The distribution area has been expanding to the north and west with the summer monsoon since mid-April, and in late October, the region began to shrink to the east and south. The value of relative soil moisture increases with the increase of soil depth, and the distribution of farmland in high-value area increases with the increase of soil depth. The relative soil moisture of farmland increases fastest in summer and autumn, and the range of change decreases with the increase of soil depth. There is a strong positive correlation between relative soil moisture and precipitation. Relative soil moisture has a strong negative correlation with potential evaporation and temperature. The annual mean value of relative soil moisture in paddy field is higher than that in dry land, and the difference between the annual mean values of relative soil moisture of two types of farmland increases with the increase of soil depth.

Key words: relative soil moisture, farmland, Kriging interpolation, correlation analysis, spatial and temporal variation

PAN Hanxiong,ZHU Guofeng,ZHANG Yu,GUO Huiwen,YONG Leilei,WAN Qiaozhuo,MA Huiying,LI Sen. Spatial and temporal variations of relative soil moisture in China's farmland[J].Acta Geographica Sinica, 2019, 74(1): 117-130.

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Spatial and temporal variations of relative soil moisture in China's farmland

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