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为探讨黄土高原有、无林地土壤水分全年变化规律之异同 ,在黄土高原半湿润区 ,采用中子水分测定仪定位测定方法 ,对无林沟坡 (荒坡 )与林地土壤水分储量变化进行了连续 3年的定点测定 .结果表明 ,在 0～3 2 0cm的测定深度内 ,阴坡上、下部与阳坡下部荒坡土壤储水增量分别为 -165 .7mm、-115 .2mm和 -74.9mm ;阴坡上部的油松林地 ,在 0～ 3 2 0cm深度内 ,林地却在林木每年蒸腾消耗大量水分 (达 3 80mm以上 )后 ,增加储水量 17.2mm ,年际收支基本平衡或略有盈余 .林地与荒坡水分收支关系有着本质的差异 .提出了开展林地有效水分获取途径研究的必要性 .
In order to explore the similarities and differences of the annual variation of soil moisture in the non-woodland and the non-woodland in the Loess Plateau, the determination of neutron moisture content in the semi-humid area of the Loess Plateau was conducted to study the changes of soil water content The results showed that within the depth of 0-320 cm, the increment of soil water storage at the upper and lower slopes of the slope and the lower slope of the sunny slope were -165.7 mm, -115.2 mm and -74.9, respectively mm. In Pinus tabulaeformis forest on the top of shady slope, in the depth of 0 ~ 320 cm, the forest land transforms and consumes a large amount of water (up to 380 mm) annually, and then increases the water storage capacity by 17.2 mm. The annual balance of income and expenditure is basically balanced or slightly There are surpluses.Woods and the shortage of slope water balance of the nature of the essential differences.Proposed to carry out the study on the effective water access to forest.