黄土高原西部丘陵区不同降水条件下植被分布与土壤水分关系研究

The Relationship between Vegetation Distribution and Soil Moisture under Different Precipitation on Western Loess Plateau

研究了黄土高原西部丘陵区降水及植被空间分布特征,分析了不同降水条件下人工柠条林、混合灌木林、人工侧柏林、青杄林和人工落叶松林等5种植被类型0~100 cm土壤剖面中土壤水分含量及季节性变化。研究结果表明,0~100 cm的土壤储水量次序为青杄林】人工落叶松林】侧柏林】混合灌木林】柠条林。黄土高原西部丘陵区森林草原过渡带降水量无法完全补偿人工侧柏林生长季土壤水分消耗量,该地区选择侧柏进行人工林建设需要注意种植密度。黄土高原西部丘陵区草原地带降水量基本可以补偿人工柠条林生长季土壤水分消耗量,但随着柠条林林龄的增加,可能会出现植被水分亏缺。

In Western Loess Plateau, the spatial distribution of precipitation and vegetation characteristics were studied. And soil moisture and its seasonal variation was investigated along 0- 100 cm soil profiles under five types of vegetation, i.e., planted shrub of Caragana, mixed shrub, planted forests of arborvitae, Picea wilsonii and planted forests of Larch as well as different precipitation. The results showed that the soil water storage capacity of the 5 types of vegetation from 0 to 100 cm ordered as Picea wilsonii > planted forests of Larch > Platycladus orientalis > mixed shrub > Caragana. The precipitation in the area of Platycladus orientaliscan could not fully compensate for the consumption of soil water during the growing season, so the planting density of Platycladus orientalis needed to be controlled for vegetation restoration. The precipitationin in the area of Caraganabasically compensated for the consumption of soil water during the growing season, but with the increase of Caragana age, vegetation water deficit might occur.