兰州市北山典型侧柏混交林地土壤水分物理性质研究

Study on soil water physical properties of typicalPlatycladu sorientalis mixed plantation in northmountain of Lanzhou City

摘要:

在兰州市北山仁寿山官山林场选取人工灌溉下造林年限相同、立地条件相似的5种典型侧柏人工林地,对其土壤水分物理性质进行研究。结果表明:(1)树种组成和土层深度对土壤容重,孔隙度和持水量有显著影响;(2)0~100 cm土层,各林地土壤容重均随着土层深度增加而增大,土壤总孔隙度、毛管孔隙度、饱和持水量、毛管持水量与田间持水量则随着土层深度的增加而减小,不同林地间差异显著(P＜0.05);(3)侧柏×刺槐混交林土壤水分物理性质总体优于其他4种林地,水土保持和涵养水源能力较好。

Abstract:

Five typical Platycladu sorientalis plantations with the same afforestation period and similar site conditions under artificial irrigation from the Guanshan Forest Farm of Renshoushan in North Mountain of Lanzhou City were selected to study the soil water physical properties by the ring knife method.The results showed that forest type and soil depth had significant effects on soil bulk density,porosity and water holding capacity.Along with the increased soil depth in the 0~100cm soil layer,the soil bulk density of all forest stands increased,while the total soil porosity,capillary porosity,saturated water holding capacity,capillary water holding capacity and field water holding capacity decreased.Significant differences in all those parameters were found among different forest stands (P＜0.05).The soil water and physical properties of the Platycladus orientalis×Robinia pseudoacacia mixed forest were generally better than the other four forests,leading to better soil and water conservation capabilities.