晋西黄土区水土保持林造林整地工程效益的研究

A Study of the Effects of Different Soil Preparations on the Planting of Soil and Water Conservation Forests on Loess Plateau in West Shanxi Province

本文从土壤物理性质、土壤入渗、土壤水分动态以及造林成活率和幼林生长量等几个方面对不同整地工程的效益进了研究.结果表明,整地工程对土壤物理性质的影响主要是增加土壤非毛管孔隙度,进而增大了土壤饱和导水率,同时改善了土壤入渗性能,为土壤水分的贮存和保持创造了条件.整地工程土壤水分动态研究结果表明,整地工程土壤水分具有年内变化周期,以4、5、6月份为土壤于旱期.这期间除穴状整地外,其他各种整地工程土壤含水率比同坡向荒坡均有较明显的增加.其中,隔坡反坡梯田效果最为显著.

Benefits from different kinds of soil preparation measures to soil physical properties,soil infiltration,soil moisture dynamics and survival percentage and growth of young forest plantation are studied systematically.The results show that soil physical properties,especially noncapillary porosity,and saturated hydraulic conductivity are highly improved by means of soil preparations.This is the basis on which soil water is stored and preserved.It is confirmed that soil moisture varies periodically within a year and that April,May,June are of a soil drought period.During this period,the moisture content in the soil after adopting preparation measures except Hole Soil Preparation increases obviously compared with the wasteland at the same aspect of slope.Of these measures,the Anti-slope Alternation of Slope and Terrace is the most effective one.