土地利用方式对红枫湖入湖流域土壤团聚体磷含量及其形态的影响

杨 华; 龙 健; 李兆君; 廖红凯; 刘灵飞; 李 娟

文章摘要

杨华,龙健,李兆君,廖红凯,刘灵飞,李娟.土地利用方式对红枫湖入湖流域土壤团聚体磷含量及其形态的影响[J].农业环境科学学报,2013,32(11):2214-2220.

土地利用方式对红枫湖入湖流域土壤团聚体磷含量及其形态的影响

Effects of Land Use Types on Phosphorus Forms and Their Contents in Soil Aggregates in Watershed of Hongfeng Lake

DOI：10.11654/jaes.2013.11.016

中文关键词: 红枫湖入湖流域土地利用方式团聚体磷含量磷形态

英文关键词: Hongfeng Lake watershed land use aggregate phosphorus content phosphorus form

基金项目:

作者	单位
杨华	贵州师范大学贵州省山地环境重点实验室，贵阳 550001
龙健	贵州师范大学贵州省山地环境重点实验室，贵阳 550001
李兆君	中国农业科学院农业资源与农业区划研究所，北京 100081
廖红凯	贵州师范大学贵州省山地环境重点实验室，贵阳 550001
刘灵飞	贵州师范大学贵州省山地环境重点实验室，贵阳 550001
李娟	贵州师范大学地理与环境科学学院，贵阳 550001

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中文摘要:

以贵州省安顺市红枫湖入湖口4种典型土地利用方式（玉米地、菜园、林地及撂荒地）为研究对象，分别探讨了土地利用方式对0～15 cm和15～30 cm两个层次土壤团聚体总磷含量及其形态的影响。结果表明，不同土地利用方式下，原状土壤及各粒级团聚体总磷含量均表现为玉米地>菜园>撂荒地>林地。土壤各粒级团聚体磷形态含量以Residual P、NaOH-P、NaHCO3-P为主，其中Residual P在各土地利用方式中的含量均最高，变幅分别为玉米地 28.3%～45.4%、林地 61.1%～72.7%、菜园45.9%～53.0%、撂荒地52.1%～72.4%；玉米地和菜园土壤均表现为有机磷含量约为无机态含量的2倍；随团聚体粒径的减小，土壤对总磷含量的贡献率呈减少趋势，土壤团聚体对总磷含量贡献主要集中在5~2 mm和2～0.5 mm两个粒级中，贡献率均达77%以上，其中耕作土壤（玉米地、菜园）中5～2 mm和2～0.5 mm两个粒级团聚体中的磷是湖泊面源污染中磷素的主要贡献载体，也是造成湖泊富营养化的关键因素。

英文摘要:

Excessive phosphorus（P） in soils may increase the potential to pollute water through runoff and/or leaching. Different land use types may change phosphorus mobility. A study was performed to examine the chemical forms and their contents of P in bulk soil and soil aggregates at 0～15 cm and 15～30 cm under four land use types：cornfields, vegetable fields, forest land and abandoned land in the watershed of Hongfeng Lake in Anshun, Guizhou Province. Total P contents in bulk soils and soil aggregates were in order of cornfields>vegetable fields>abandoned land>forest land under different land use types. Residual P, NaOH-P, and NaHCO3-P were the major forms in soil aggregates at each depth. The residual P was the highest among all P forms in soils under four land use types, and ranged 28.3%～45.4%, 61.1%～72.7%, 45.9%～53.0% and 52.1%～72.4% in cornfield, forest land, vegetable field and abandoned land, respectively. The organic P contents were as about 2 times as inorganic P contents in cornfield and vegetable field. Soil P was mainly present in soil aggregates of 5～2 mm and 2～0.5 mm, accounting for more than 77% of soil total P. Phosphorus in aggregates of 5～2 mm and 2～0.5 mm in cultivated soils including cornfield and vegetable field were the main contributors to lake P and could be the key factor of the lake eutrophication.

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