PHOSPHORUS SORPTION CHARACTERISTICS OF SOILS FROM A SMALL HEADWATER WATERSHED OF MIYUN RESERVOIR OF BEIJING, CHINA

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外文摘要：Non-point source phosphorus (P) is a major limiting factor for freshwater eutrophication, it has attracted more and more attention in China. This study investigated P sorption and desorption of 10 soils P runoff from the headwater watershed of the Miyun reservoir. The results show that the rapid sorption of P from soil (with an average 49% occurring in the initial 30 min of reaction). P sorption capacity were influenced by soil organic matter, metal hydroxides, calcium, and clay contents. Calculated Langmuir parameters EPC0 and K, indicated a propensity for soil to release P. Erosion material derived from soils with a low EPC0 (<0.02 mg PL-1) acted as a sink for P and that derived from soils with a large EPC0 acted as a source of P. Rainfall runoff experiment were conducted to monitor soil erosion in June to September 2008 (wet season) from 22 plots in the Shixia watershed. Soils derived from different land-use types have varied P sorption capacities with that of soil from corn fields and riverbed was significantly higher than that from forest and grass areas. This study showed that soil properties can determine of a specific soil can be a sink or source of P to runoff and that actual P runoff can be described by these properties.

外文关键词：

Phosphorussorptionnonpoint source pollutionMiyun Reservoir

作者：

Geng, Runzhe、Wang, Xiaoyan、Sharpley, Andrew、Yin, Jie

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作者单位：

Capital Normal Univ, Coll Resources Environm & Tourism, Beijing 100048, Peoples R China|Minist Environm Protect, Policy Res Ctr Environm & Econ, Beijing 100029, Peoples R China

Capital Normal Univ, Coll Resources Environm & Tourism, Beijing 100048, Peoples R China

Univ Arkansas, Dept Crop Soil & Environm Sci, Fayetteville, AR 72701 USA

出版年：

2015

Fresenius environmental bulletin: FEB

ISTP

ISSN：1018-4619

年,卷(期)：2015.24(12App.)