连续不同施肥对土壤团聚性影响的研究  

Effect of Different Fertilization on Soil Characteristics of Aggregate

作　　者：刘京[1] 常庆瑞[1] 李岗 魏永胜 

机构地区：[1]西北农林科技大学资源与环境科学系,陕西杨陵712100

出　　处：《水土保持通报》2000年第4期24-26,共3页Bulletin of Soil and Water Conservation

基　　金：国家"九五"重点攻关项目! ( 96-0 0 7-0 5 -0 8)"黄土台塬 (乾县 )粮食高产型农业综合发展研究"

摘　　要：通过对乾县试区土壤定点培肥试验地土壤团聚体及微团聚体的分析测定 ,得出连续不同施肥水平下的土壤有机质含量、各级团聚体及微团聚体数量与组成差异明显。与对照相比 ,随着施肥水平的提高 ,土壤有机质、1 0— 2 5 0μm微团聚体和 >0 .2 5 mm团聚体不断增加 ,<1 0μm的微团聚体含量有下降趋势 ;土壤分散系数减小 ,结构系数增大 ,土壤容重降低 ;特别是施高量有机肥或有机—无机配施 ,更有利于土壤中较大粒径团聚体的形成和土壤结构的改善。相关分析表明 :土壤有机质与 >0 .2 5 mm团聚体和 1 0— 2 5 0μm微团聚体呈极显著正线性相关 ,与 <1 0 μm微团聚体含量呈显著负线性相关。The soil aggregate and micro aggregate of fixed fertilization plots in Qianxian county, Shaanxi province are studied. The results showed that the disparities were remarkable in content of soil organic matter, the quantity and proportion of each grade of aggregate and micro aggregate in different fertilization levels. Compared with the contrast, raising the level of fertilization, soil organic matter, 10—250 μm micro aggregate and >0.25 mm aggregate increased constantly, and the quantity of <10 μm micro aggregate had the decreasing trend. Soil coefficient of disperse decreased and that of the soil structure increased. Analysis showed that the content of organic matter was positively linear corelated to quantity of >0.25 mm aggregate and 10—250 μm micro aggregate respectively, and was negatively linear corelated to <10 μm micro aggregate. Raising fertilization, especially raising quantity of organic fertilizer or blending organic fertilizer and inorganic one, it is benefited for forming the bigger diameter aggregate.

关 键 词：团聚体 微团聚体 有机质 土壤肥力 土壤结构 

分 类 号：S158[农业科学—土壤学] S152.45[农业科学—农业基础科学]