三峡库区兰陵溪消落带土壤磷分布特征及生物可利用性评价

生态学杂志

三峡库区兰陵溪消落带土壤磷分布特征及生物可利用性评价

吴起鑫^1,2,韩贵琳^3*

(¹贵州大学国土资源部喀斯特环境与地质灾害重点实验室，贵阳 550025；²贵州大学资源与环境工程学院，贵阳 550025；³中国地质大学（北京）科学研究院，北京 100083)

出版日期:2018-03-10 发布日期:2018-03-10

Distribution and bioavailability of soil phosphorus at the riparian zone of Lanlingxiwatershed in the Three Gorges.

WU Qi-xin^1,2, HAN Gui-lin^3*

(¹Key Laboratory of KarstEnvironment and Geohazard, Ministry of Land and Resources, Guizhou University, Guiyang 550025, China; ²College of Resources and Environmental Engineering, Guizhou University,Guiyang 550025, China; ³School of Scientific Research, China University of Geosciences(Beijing), Beijing 100083, China).

Online:2018-03-10 Published:2018-03-10

摘要/Abstract

摘要： 库区消落带在反复淹水条件下，会引起土壤磷含量和形态发生改变。本研究以三峡库区兰陵溪小流域消落带为研究对象，分析了不同高程消落带土壤总磷和不同形态磷的变化。结果表明，兰陵溪消落带总磷平均含量为508.48 mg·kg^-1，低于背景区，表明淹水导致消落带土壤磷含量总体降低。不同形态的磷表现出碎屑磷灰石>闭蓄态磷>铁结合态磷>铝结合态磷>有机磷>钙结合态磷>弱吸附态磷的特征，碎屑磷灰石和闭蓄态磷是兰陵溪消落带主要形态的磷。生物可利用磷平均含量为204.12 mg·kg^-1；当水位上升，土壤淹没水面之下时，消落带土壤具有一定的磷释放潜力。

关键词: 土地承载力, 剩余开发强度, 空间匹配度, 城乡建设用地可承载临界值, 环鄱阳湖城市群

Abstract: The fluctuations of water level can lead to the changes of the concentration and forms of phosphorus (P) in the riparian zone. In this study, we investigated the changes of forms and bio-availability of P in different elevations of riparian zone of Lanlinxi catchment in Three Gorges Reservoir. The mean concentration of total P was 508.48 mg·kg-1, which is lower than that of the background soil, suggesting that the submerging led to P release in the riparian zone. Detrital apatite P and occluded P were the main forms of P in Lanlinxi riparian zone. The concentrations of various forms of P were following the order: detrital apatite P > occluded P > Fe bound P > Albound P > organic P > authigenic apatite P > loosely adsorbed P. The mean concentration of bio-available P was 204.12 mg·kg^-1. Phosphorus would be released to the water body when riparian zone was submerged.

Key words: Poyang Lake urban agglomeration, bearable critical threshold of urban-rural construction land, remaining development intensity, land carrying capacity, spatial matching degree

吴起鑫,韩贵琳. 三峡库区兰陵溪消落带土壤磷分布特征及生物可利用性评价[J]. 生态学杂志.

WU Qi-xin, HAN Gui-lin. Distribution and bioavailability of soil phosphorus at the riparian zone of Lanlingxiwatershed in the Three Gorges.[J]. cje.