摘要
在野外调查和室内实验分析的基础上,研究了黄土丘陵区不同林龄柠条人工林地土壤物理性质和有机质的变化情况。结果表明:随着柠条林龄的增加,柠条林可增加土壤粉粒和黏粒含量,降低土壤容重(50a柠条除外),改善毛管孔隙状况,促进土壤的正向发育,>5mm土壤水稳性团聚体含量逐渐增加,而>0.25mm水稳性团聚体和有机质均出现先减小后增大的现象;在土壤剖面上,由于表层土壤受到根系和枯落物的共同影响,柠条林对表层土壤的各项物理性质改善作用最为明显,随土层深度增加其改善作用逐渐减弱。
Based on field investigation and analysis in lab,the variation of physical properties and organic matter of soil under impacts of Caragana korshinskii plantation with different ages in loess hilly region were studied in this paper. The results showed that as age grew,Caragana korshinskii plantation could increase silt and clay proportions in soil but lower the bulk density (except 50 years old plantation),besides,improve the soil porosity,promote positive development of the soil. In the aging process of Caragana korshinskii plantation,the content of water stable aggregate〉5 mm gradually increased; the content of water stable aggregate〉0.25 mm and organic matter declined at first,then increased. Caragana korshinskii plantation had the most obvious improving effect on physical properties of top soil layer. But deeper the soil profile was,the weaker the effect was.
出处
《水土保持研究》
CSCD
北大核心
2010年第3期105-109,共5页
Research of Soil and Water Conservation
基金
陕西省科学院科技计划重点项目"陕北黄土丘陵区植被恢复与动物多样性保护关键技术"(2008K-04)
国家科技支撑重点课题"植被优化配置与可持续建设技术"(2006BAD09B03)
中科院西部行动计划课题"林草植被恢复潜力与生态稳定性"(KZCX2-XB2-05-03)
关键词
柠条林
黄土丘陵区
物理性质
有机质
Caragana korshinskii plantation
loess hilly region
physical property
organic matter