宁南山区植被恢复对土壤团聚体特征及腐殖质分布的影响  

Effects of Re-vegetation on Characteristics of Soil Aggregates and Humus in Soil Aggregate in Loess Hilly Region of Southern Ningxia

作　　者：朱秋莲[1,2,3] 程曼[1,3] 安韶山[1,3] 薛志婧[1,3] 

机构地区：[1]西北农林科技大学水土保持研究所,陕西杨凌712100 [2]西藏职业技术学院农林系,西藏拉萨850030 [3]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《水土保持学报》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)

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.

关 键 词：植被恢复 团聚体稳定性 腐殖质 宁南山区 

分 类 号：S152.4[农业科学—土壤学]