植物营养与肥料学报Issue(2)：346-354,9.DOI:10.11674/zwyf.2014.0210
不同土壤管理措施下土团聚体的大小分布及其稳定性
Effects of soil management practices on stability and distribution of aggregates in Lou soil
摘要
Abstract
Soil aggregate is a main component of soil , and its size distribution has an important effect on soil function .This study investigated effects of soil management practices on distribution of dry aggregates and water -stable aggregates based on a 22-year long-term experiment on Lou soil in Guanzhong Plain , Shaanxi province , China .The soil management practices were cropland abandonment ( Set aside ) , bare fallow without vegetation (Fallow) and a wheat-maize cropping system (Cropping).The Cropping was combined with the following nutrient management treatments:control ( CK, no nutrient input ) , nitrogen only ( N ) , nitrogen and potassium ( NK ) , phosphorus and potassium ( PK), NP, NPK and straw plus NPK ( SNPK) and two levels of manure plus NPK ( M1 NPK and M2 NPK ) . The soil management practices have significantly effects on the distribution of dry aggregates and water stable aggregates in the surface and subsurface soil layers (0-10 and 10-20 cm).Compared with the Cropping , the fallow treatment increases the proportion of dry microaggregates (<0.25 mm) , but has no significant effects on distribution of water-stable aggregates , and the Set aside treatment increases the proportion of macroaggregates ( larger than 2 mm in size ) and aggregate stability .The distributions of dry aggregates and water stable aggregates are significantly impacted by the fertilization in all soil depths under the Cropping .Generally , the proportions of aggregates in sizes >1 mm under the fertilization are lower than those of no fertilization , and the proportions of aggregates in sizes of 0.25-0.5 mm and 0.5-1 mm in the treatments which received both N and P are higher than that of the control .It is concluded that the abandonment of cropland after 22-year significantly improves aggregate stability , while the long-term fertilization practices significantly influence the distribution of soil aggregates and have not significant effects on the aggregate stability under the cropping system in Lou soil .关键词
土壤管理措施/土/土壤团聚体Key words
soil management practices/lou soil/soil aggregates分类
农业科技引用本文复制引用
李婕,杨学云,孙本华,张树兰..不同土壤管理措施下土团聚体的大小分布及其稳定性[J].植物营养与肥料学报,2014,(2):346-354,9.基金项目
国家公益性行业（农业）科研专项（201203030）；农业部农业科研杰出人才及其创新团队培养计划（2012）项目资助。 （）
