华北土石山区土壤水分动态研究

通过对华北土石山区阴坡油松林、阴坡裸地和阳坡侧柏栎类混交林土壤水分研究可知,阴坡光照时间和强度较阳坡小,相应的林地蒸发散减少,有利于林地的蓄水,增加土壤的含水量。不同月份含水量的变化规律是一致的,阴坡油松林地>阴坡裸地>阳坡侧柏栎类混交林地;试验地的土壤含水量在生长季内总的变化趋势和降雨的趋势一致,都是先上升后下降,8月份达到最大;阳坡针阔混交林和油松林的土壤垂直变化规律基本一致,表层0~40 cm的土壤含水量差别不大,主要是7月份的土壤含水量变化比较大。从土壤含水量的最大值与最小值的差距可以看出,阳坡针阔混交林土壤含水量的差距最大为27.75%,变化最剧烈,阴坡油松林林地土壤含水量的差距最小,为13.07%,含水量变化不明显。年内与平均值的差距是裸地最大,阳坡针阔混交林林地最小。

The Dynamic Study of Soil Water in Rocky Mountain Area of Northern China

By studying on the soil water of pine forests and bare soil of shady slope,and Platycladus orientalis and oak mixed forests of sunny slope in rocky mountain area of northern China,there was less illumination time and intensity in the shady slope than in the sunny slope,so the evaporation of shady slope was little,which was propitious to hold water and increase water in the soil.The change rule of water contain was coincident in the different months,which was that pine forests of shady slope>bare soil of shady slope>Platycladus orientalis and oak mixed forests of sunny slope;The change trend of soil water was coincident with the rainfall in the growth season in the examination terra,which was firstly ascent,then descent,and the biggest quantity was in the August.The uprightness change rule of pine forests of shady slope and mixed forests of sunny slope was coincident.The soil water was little different in the 0~40 cm surface,which the biggest change was in the July.By the gap of the biggest and less quantity of soil water,the gap of soil water was 27.75% in the mixed forests of sunny slope,which was the biggest and acutest,and the gap of soil water was 13.05% in the pine forests of shady slope,which was the less and not evidence.The average gap of bare soil was the biggest,and the average gap of mixed forests was less in a year.