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对如东县海堤防护林地土壤水分的动态特征进行 3a定位研究 ,结果表明 ,各地类土壤水分动态变化主要取决于气候 (降雨量的多少 )条件和季节变化 ;不同地类土壤含水量的季节变化趋势基本一致 ,有林地的土壤含水量高低次序是柳杉林地 >水杉林地 >刺槐林地 ,无林地 (少水年或平水年 )土壤含水量高于水杉林地和刺槐林地 ,丰水年则低于有林地 ;根据土壤水分季节变化划分为土壤水分相对稳定期、消耗补偿期、亏损期和积累期 ;依据土壤水分变化变异系数大小 ,将土壤水分垂直分布划分为土壤水分活跃层、次活跃层和稳定层 ,土壤水分与降雨的相关性虽较低 ,但对各地类表土层水分影响最为明显
The results showed that the dynamic changes of soil moisture in various types of soils mainly depend on the climate (the amount of rainfall) and the seasonal variation; the seasonal variation of soil moisture in different types of soils The trend of soil moisture content in forestland was that of Cryptomeria fortunei> Metasequoia woodland> Robinia pseudoacacia forestland, and the soil water content of non-forest land (less water year or plain water year) was higher than that of Metasequoia glyptostroboides forest and Robinia pseudoacacia forestland, The soil water content was lower than that of the forest land; According to the seasonal variation of soil moisture, the soil moisture was divided into the relative stable period, the compensation period, the depletion period and the accumulation period. According to the variation coefficient of soil moisture, the vertical distribution of soil moisture was divided into active soil layer Active and stable layers, although the correlation between soil moisture and rainfall is low, but the most obvious impact on the topsoil moisture