农业环境科学学报Issue(2)：337-344,8.DOI:10.11654/jaes.2015.02.018
濆江流域不同土地利用方式下土壤磷积累特征及流失风险
Accumulation and Loss Risk of Soil Phosphorus Under Different Land Uses in Fenjiang River Watershed
摘要
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 sur—face 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.关键词
濆江流域/土地利用方式/土壤磷素/积累特征/流失风险Key words
Fenjiang River watershed/land use types/soil phosphorus/accumulation/potential loss risk分类
资源环境引用本文复制引用
黄永杰,张世熔,蒲玉琳,杨玲,徐小逊,贾永霞..濆江流域不同土地利用方式下土壤磷积累特征及流失风险[J].农业环境科学学报,2015,(2):337-344,8.基金项目
四川省教育厅项目（14ZB0011）；四川省科技支撑计划 （）
