晋西北主要造林树种土壤水分特征研究

Study on Soil Moisture Characteristics of the Main Forestation Tree Species

土壤水分是影响干旱半干旱地区人工造林的关键因子,为查明人工林土壤水分消耗状况,以晋西北岚县人工柠条和油松为研究对象,草地作为对照,定量分析和评价0-600cm土壤水分垂直剖面变化。结果表明：油松林地的土壤含水量在7.8%-9.7%之间变化,柠条林地土壤含水量的变化范围为7.3%-11.3%;油松和柠条林地存在不同程度的轻度干层和中度干层,含水量小于6%的重度干层不存在;油松林地枯落物的水文效应使其表层土壤含水量变异低于柠条林地。不同土层,不同植被类型土壤水分亏缺程度不同。从土壤水分亏缺的垂直变化来看,表层〉中层〉底层。从不同植被类型来看,柠条〉油松〉草地。

Soil moisture is the key factor affecting the forestation in arid and semiarid regions. In order to find out the water consumption of artificial forest soil, taking Artificial Caragena and Pinus tabulaeformis as the research object and wasteland as a control in Lanxian Shanxi Province. Quantitatively analysis and evaluate the soil water vertical profile changes in 0- 600 cm. It shows that： soil water content of Pinus tabulaeformis forest changes in the range of 7.8 %- 9.7 %. And the Caragana korshinskii forest changes for 7.3 % - 11.3 %; Pinus tabulaeformis and Caragana korshinskii have different degrees of mild and moderate dry layer and dry layer, The dry layer with little water content of 6% was not present. Hydrological effect of Pinus tabulaeformis litter to soil moisture variation is lower than that of Caragana forest. According to different soil layers and vegetation types, the soil water deficit is different. The vertical changes of soil water deficit is the surface layer 〉 middle layer bottom layer. And on the different vegetation types, the soil water deficit is Caragana korshinskii 〉 Pinus tabulaeformis grass land.