摘要
在野外调查和室内分析的基础上,研究宁南山区植被恢复对土壤团聚体大小、分布和稳定性的影响,并对土壤团聚体中腐殖质的分布加以研究。结果表明,干筛法测定得到的R0.25在53.2%～71.3%之间,MWD在1.98～2.59之间,GMD在0.96～1.14之间,分形维数在2.70～2.83之间;湿筛法测定的R0.25、MWD、GMD均为天然草地最大,25年柠条、15年柠条次之,坡耕地最小。不同植被恢复措施下土壤的腐殖质碳含量在0.53～2.67g/kg之间变化,1～0.25mm大小的团聚体腐殖质碳含量相对高于其他粒级团聚体。逐步回归表明,影响团聚体大小分布和水稳性的因素是1～0.25mm大小的团聚体中腐殖质含量。
Based on field investigation and analysis in the laboratory,the effects of different re-vegetation types on the aggregation and stability of soil aggregates in loess hilly region of southern Ningxia were studied,and humus in soil aggregate were studied as well.The results showed that:Characteristics of soil aggregate from wet-sieving were as follows,R0.25 was between 53.2%and 71.3%,MWD was between 1.98 and 2.59,GMD was between 0.96and 1.14,fractal dimension was between 2.70and 2.83.R0.25,MWD and GMD from dry-sieving were followed in this order:Natural grassland was the biggest,15-year-old and 25-year-old Caragana korshinskii Kom.were the second,crop land was the smallest.After re-vegetation the content of soil humus was changed in 0.53～2.67g/kg,content of soil humus in 1～0.25 mm diameter aggregate was higher than other diameter aggregates.The result of step-wise regression analysis showed that content of soil humus in 1～0.25 mm diameter aggregate influenced the aggregation and stability of soil aggregates.
出处
《水土保持学报》
CSCD
北大核心
2013年第4期247-251,257,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金面上项目(41171226)
新世纪优秀人才支持计划项目(NCET-12-0473)
西北农林科技大学"优秀青年人才"科研专项(QN2011049)
关键词
植被恢复
团聚体稳定性
腐殖质
宁南山区
re-vegetation
stability of soil aggregates
humus
loess hilly region of southern Ningxia
