大青山区不同密度人工油松林地土壤水分动态规律的研究

对大青山区的30 a生人工油松(Pinus tabulaeform is)林5种密度(2 202株.hm-2、2 933株.hm-2、3 275株.hm-2、3 307株.hm-2、4 463株.hm-2)林分的土壤含水量进行观测、研究。结果表明:不同密度各林分土壤含水量在季节变化上趋于一致,各层土壤含水量的高峰出现在7月份、8月份,其它时期含水量变幅不大,稳定在1个较低水平。土壤含水量垂直变化规律:4月、9月土壤含水量随土层深度增加而增加,5月、7月、8月土壤含水量随深度的增加而降低,6月随深度的变化不显著。土壤含水量随土层深度增加变幅减小。生长季土壤含水量随林分密度不同呈现出两种规律:在雨季土壤含水量随密度的增大先降低再升高,其他月份土壤含水量随密度的增大而减少。

A STUDY ON SOIL MOISTURE DYNAMICS OF PINUS TABULAEFORMIS PLANTATION WITH DIFFERENT DENSITIES IN DAQING- MOUNTAINS REGION

The soil moisture dynamics of 30a Pinus tabulaeformis plantation with five different densities in Daqing-Mountains region was studied.The results showed that the peaks of each layer soil moisture content appeared at July,August.Soil moisture content in other periods changed slightly and stayed on a lower level.The vertical variation showed that the soil moisture content increased with the increment of soil layer in April and September,but in May,July and August it had a contrary law.It was not obvious in June.During growing season,the variation of soil moisture content with different stand densities showed two laws: In raining season the soil moisture content decreased after increased first with increment of stand densities,and decreased in other months.