黄土丘陵沟壑区密植枣林株行间土壤水分状况

Soil moisture among plants and in rows of the close planting Jujube forest in the loess hi1ly and gully region

为了揭示陕北山地密植红枣林土壤水分空间分布状况,对枣林株行间不同位置(株间、行间、中心点)0～200 cm土层的土壤水进行了连续观测。结果表明:在7～9月,枣林地株间土壤水分状况明显好于行间。株间、行间、中心点土壤含水量均值分别为9.77%、7.66%、7.52%。不同降雨量下枣林地株行间不同位置土壤水分的累计入渗量不同,株间入渗量大于行间,且随着降雨量的增大,各位置入渗量也随之增大,株间的入渗补给作用在增强,但行间的入渗补给作用在减弱。中雨(p=14.8 mm),株间、行间、中心点累计入渗量分别为13.5、8.8、8.4 mm;大雨(p=31.6 mm),株间、行间、中心点累计入渗量分别为30.9、16.5、12、8mm。雨后枣林地株行间不同位置土壤水分日均消耗量以株间最大,达4.09 mm/d,行间次之,为3.77 mm/d,中心点最小,为2.27 mm/d。

In order to reveal the characteristics of spatial distribution of soil moisture in the close planting Jujube forest in Northern Shaanxi Province, continuous monitoring of soil moisture in 0 - 200 cm soil layer was carried out in different positions （inter-tree, inter-row and center-point） of the Jujube forest. The results indicated that soil moisture of inter-tree was significantly better than inter-row in July - September. The average soil water of inter-tree, inter-row and center-point was 9.77 %, 7.66 % and 7.52 %. With the changing of rainfall, cumulative infiltration was different in various positions of the Jujube forest. The infiltration capacity of inter-tree was larger than that of inter-row. With the in- crease of rainfall, the infiltration capacity increased in all positions and the infiltration was recharged. The function in inter-tree increased, but that in inter-row decreased. For example, in the moderate rain （p = 14.8 ram）, the infiltration capacity of inter-tree, inter-row and center-point was 15.5 mum, 8.8 mm and 8.4 mm; while in the heavy rain （p = 31.6 mm）, that was 30.9 ram, 16.5 mm and 12.8 ram, respectively. The average daily consumption of soil water in inter-tree was the highest （4.09 mm/d）, followed by that in inter-row （3.77 ram/d）, and that in center-point was the lowest （2.77 ram/d） in all positions.