黑龙江省东部山地天然次生林土壤水分的研究

对黑龙江省东部山地不同地形天然次生林土壤水分含量进行研究，结果表明：①不同地形天然次生林土壤含水量随土壤深度的增加逐渐减小；③在0—10cm处各林型土壤平均含水量差异最大，达20．47％，30．40cm处各林型土壤含水量差异最小，仅8．00％；③不同地形天然次生林6～9月份土壤含水量总体上呈先增大后减小．7月份最大值为59．09％；8、9月份土壤含水量有小幅度下降，其中椴树蒙古栎林在20～30cm深度内土壤含水量达到12．31％；①8月份高温是各林型土壤含水量下降的主要因素，但对地处阴坡样地影响较小；③不同地形天然次生林土壤持水量的高低主要取决于其不同的地形条件下形成的土壤结构及孔隙状况。

Study on Soil Moisture of Natural Secondary Forests in Eastern Mountainous Region of Heilongjiang Province

The soil water content of different natural secondary forests in eastern mountains of Heilongjiang Province was studied, and the results showed that: ①The soil moisture of natural secondary forests in different terrains declined gradually as the soil depth increased; ②The soil water contents varied most in the depth of 0～10 cm, up to 20.47%. While there were mini-mum difference in the depth of 30-40 cm, merely 8.00%; ③The soil moisture of natural secondary forests in different terrains increased first and then declined from June to September, reaching to the peak of 59.09% in July and dropping slightly in August and September, in which the soil water content of 20-30 cm in Tilia and Quercus mongolica forest was 12.31%; ④High tem-perature was the primary factor leading to the decline of soil moisture in August, but it had less impact on shady slope; ⑤The soil water retention of natural secondary forests mainly depended on the soil structure and porosity status under different terrains condi-tion.