土壤保肥-供肥机理及其调节Ⅲ.棕壤型菜园土的N素保持与供应  

Mechanism of nutrient preservation and supply by soil and its regulation Ⅲ. N preservation and supply by brown earth type vegetable garden soil

作　　者：陈利军[1] 周礼恺[1] 张岫岚[1] 

机构地区：[1]中国科学院沈阳应用生态研究所,沈阳110015

出　　处：《应用生态学报》1999年第6期676-678,共3页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金

摘　　要：对辽宁省北部、中部及南部棕壤型菜园土１５ 对肥、瘦地Ｎ 素保持与供应性能的研究表明，绝大多数肥地及其各粒级微团聚体的全Ｎ 量、ＮＨ＋４ 吸附与解吸量均大于瘦地及其各相应粒级微团聚体的，而ＮＨ＋４ 解吸率则相反．除了大粒级微团聚体外，肥、瘦地及其小粒级微团聚体全Ｎ 储量与ＮＨ＋４ 吸附与解吸性能均有显著差异．肥、瘦地微团聚体的ＮＨ＋４ 吸附与解吸量均随粒径的增大而降低，解吸率则随之升高．ＮＨ＋４ 吸附与营养物质或酶活性等大多没有显著的线性相关关系；肥地及各粒级微团聚体ＮＨ＋４ 解吸与土壤有机质及其结合形态、全Ｎ 含量、脲酶与磷酸酶活性等呈显著线性正相关，瘦地及其各相应粒级微团聚体的与营养物质含量和酶活性均无显著线性相关关系．Determination of N preservation and supply performances of 15 pairs of fertile and infertile brown earth type vegetable garden soils sampled from northern, central and southern Liaoning province show that in most soil samples tested, fertile soils and their various particle sizes of microaggregates had a larger amount of total N and adsorbed and desorbed NH + 4, but a smaller desorption rate than infertile soils and their corresponding particle sizes of microaggregates. There are significant different between total N, adsorbed and desorbed NH + 4 of fertile and infertile soils and their microaggragate of <10μm. The amount of adsorbed and desorbed N decreased with the increment of microaggregates particle sizes in both fertile and infertile soils, but the desorption rate was reversed. NH + 4 adsorption had no significant linear relationship with soil nutrients and enzyme activities,but NH + 4 desorption of fertile soils and their various particle sizes of microaggregates had significant linear positive relationships with soil organic matter and its binding status, total N content, urease and phosphatase activities, NH + 4 desorption of infertile soils and their corresponding particle sizes of microaggregates had no significant linear positive relationships with all nutrients contents and enzyme activities.

关 键 词：棕壤型菜园土 土壤肥力 氮素 保持 供应 微团聚 

分 类 号：S158.5[农业科学—土壤学] S152.481[农业科学—农业基础科学]