摘要
[目的]揭示不同栽培年限日光温室土壤团聚体分布及稳定性的变化趋势,为探明设施蔬菜栽培土壤结构变化规律提供理论依据。[方法]以辽宁省新民市设施蔬菜栽培基地温室土壤为研究对象,并以温室外露地土壤为对照,研究了栽培年限为2,5,8,16a的日光温室土壤团聚体不同粒级的组成分布、机械稳定性、水稳性和团聚体破坏率的变化趋势。[结果]不同栽培年限的土壤>0.25mm团聚体数量、机械稳定性和水稳性均呈降低趋势,且低于露地土壤;栽培时间长于5a后,>0.25mm团聚体数量、机械稳定性和水稳定性有所升高。供试土壤在栽培初期,土壤中有机质对团聚体的形成和稳定性维持没有起到促进作用,随着栽培时间的增长,有机质促进了团聚体的形成和稳定。[结论]研究区域温室土壤团聚体稳定性随栽培年限的增长呈先降低后升高的趋势。
[Objective]Changing trends of size hierarchy and stability of soil aggregates in solar greenhouse soils were illustrated along years of plantation to provide some theoretical bases for the change of soil structure in vegetable cultivation.[Methods]Soils with different plantation years in four vegetable greenhouses（with 2,5,8and 16 years of plantation）in Xinmin City of Liaoning Province were selected as the research objects,and nearby soils in open fields outside of the greenhouses were selected for comparison.Indices of composition,mechanical stability,water stability and damage rate of soil aggregate were measured.[Results]Within 5years of plantation,quantity of〉0.25 mm,mechanical stability and water stability of soil aggregates showed a decreasing trend along plantation,and they were lower than that of the comparative soil in open fields;After 5years of plantation,they all were elevated significantly.At the beginning of the cultivation of the tested soil,organic matter didn＇t play its role in the aggregate formation and stability maintenance;While,with the increase of planting time,organic matter began to promote the formation and maintain the stability of soil aggregates.[Conclusion]The stability of soil aggregate in the regional greenhouse decreased firstly and then increased with the increase of the planting years.
出处
《水土保持通报》
CSCD
2015年第6期70-74,80,共6页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"长期定位施肥对设施蔬菜栽培土壤团聚体稳定性的影响研究"(31171977)
辽宁环境科研教育123工程项目(CEPF2012-123-1-4)
关键词
日光温室
团聚体
栽培年限
机械稳定性
水稳性
solar greenhouse
aggregates
planted years
mechanical stability
water stability
