沙地不同密度樟子松林地土壤水分的垂直变化

Vertical Changes of Soil Moisture in Pinus sylvestris var.mongolica Woodland with Different Densities

通过在辽宁省章古台试验区对沙地不同密度樟子松林地土壤水分垂直变化规律的研究,结果表明:该地区樟子松林分不论密度大小,雨季土壤含水量整体上明显高于春季;不同林分密度的樟子松林土壤水分含量在不同时期不同层次有所不同,春季试验地各层土壤的含水量从上到下大体上呈下降趋势,北试验地0～60cm层次土壤含水量下降的比较明显,南试验地在60～100cm层次间出现了急剧下降的情况;雨季0～40cm土层间,试验地土壤水分含量都呈上升趋势,40～150cm这几个层次间,试验地土壤含水量均呈下降趋势,且在40～100cm的层次上2试验地下降的幅度都比较大。

Law of vertical variation in soil moisture in Pinus sylvestris var. mongolica woodland with different densities in Zhanggutai Test District in Liaoning Province was studied. Result shows that： soil moisture in rainy season, which in the region of Pinus sylvestris var. mongolica stand regardless of their density size,is significantly higher than that in the whole spring; soil moisture content of Pinus sylvestris var. mongolica stand with different stand densities are different at different levels at different periods;the moisture content with layers of soil at testing ground in spring appear downward trend from top to bottom in general;soil moisture of 0-60 cm soil layers in northern tes- ting ground decrease more significantly;there has been a sharp decline in 60-100 cm level in southern testing ground; soil moisture of testing ground appear upward trend in rainy season at 0-40 cm soil layer; soil moisture of testing ground appear downward trend during 40-150 cm;declining range of 2 testing ground in the level of 40-100 cm are larger.