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| Accumulation and Loss Risk of Soil Phosphorus Under Different Land Uses in Fenjiang River Watershed |
| Received:August 21, 2014 |
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| KeyWord:Fenjiang River watershed;land use types;soil phosphorus;accumulation;potential loss risk |
| Author Name | Affiliation | E-mail | | HUANG Yong-jie | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China | | | ZHANG Shi-rong | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | | | PU Yu-lin | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | pyulin@sicau.edu.cn | | YANG Ling | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | | | XU Xiao-xun | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | | | JIA Yong-xia | College of Resources and Environment, Sichuan Agricultural University, Chengdu 611130, China
Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu 611130, China | |
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| Abstract: |
| Phosphorus(P) is one of the greatest demanded nutrients for crop growth, but unreasonable land use and management are major factors causing non-point source P pollution. This paper examined accumulation and sorption characteristics and potential loss risk of surface soil P under seven land-use types in the Fenjiang River watershed, using field investigation, laboratory analysis, and mathematical statistics. The seven land-use types include farmland(FL), orchard land(OL), tea plantation land(TP), artificial forest land(AF), natural forest land(NL), forage grass land(FG), and weeds land(WL). The content of soil total P in AF, FG and FL were greater than 1.0 g·kg-1, showing an accumulation trend. In FG and FL, soil Olsen-P content was equal to or higher than 40.0 mg·kg-1, exceeding the critical value of P loss. The content of soil CaCl2-P was higher than 4.5 mg·kg-1 in AF, FG and FL, exceeding the critical value of P loss as well. TP soil had a stronger P sorption and fixation, whereas FL, OL, AF, and FG had a weaker P sorption and fixation, especially AF. The present results show that AL, FL and FG have higher potential risk of P runoff loss and leaching, while OL, WL and NL have a relatively lower risk of P loss. TP soil has almost no P loss risk. |
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