基于水分变化的沙地樟子松人工林土壤分层特征

Soil layered characteristics of Pinus sylvestris var. mongolica plantations based on the change of soil moisture content

研究了章古台地区沙地樟子松人工林不同林龄(10a,20a,35a,50a,60a)不同深度(20cm,40cm,60cm,80cm,100cm,120cm,140cm,160cm,180cm)的土壤含水量变化的分层特征。结果表明:沙地樟子松人工林地各土壤层次水分含量随林龄的不同表现各异。依据土壤含水量的不同将沙地樟子松人工林地土壤层次分为3层,即表层、根系层和稳定层,各林龄的层次分别为:10a林龄林地无明显表层,100cm土层以上为根系层,120cm土层以下为稳定层;20a林龄林地40cm以上为表层,60-140cm为根系层,160cm以下为稳定层;35a林龄林地40cm土层以上为表层,60-100cm为根系层,120cm以下为稳定层;50a林龄林地40cm以上为表层,60-120cm为根系层,140cm以下为稳定层;60a林龄林地40cm以上为表层,60-100cm为根系层,120cm以下为稳定层。

Change of soil moisture contents at different soil depth layers（ 20 cm,40cm,80 cm,100cm,120 cm,140cm,160 cm,180cm） in different ages of Pinus sylvestris var. Mongolica（ 10 a,20a,35 a,50a,60a） plantations in Zhanggutai region were studied. The results showed that the change of soil water content in different soil layers varied with the ages. According to the variation of soil water content in different soil depth,the soil of Pinus sylvestris var. mongolica plantation was divided into three layers： the surface layer,root layer and stable layer. The soil layer demarcation results for different ages were presented as follow： for 10 a of forest soil,surface layer was not exist,0 ~ 100 cm was determined as root layer and below 120 cm was the stable layer; 0 ~ 40 cm,60~ 140 cm,and 160 cm was the surface layer,root layer and stable layer,respectively for the 20 a woodland soil. For 35 a woodland,0 ~ 40 cm soil layer was the surface layer,60 ~ 100 cm and 120 cm was root layer and stable layer,respectively. When the woodland age was 50 a,the surface layer,root layer and stable layer can be identified as 0 ~ 40 cm,60 ~ 120 cm and 140 cm,respectively. 0 ~ 40 cm,60-100 cm and 120 cm can be as the surface layer,root layer and stable layer for 60 a of woodland.