Variation of net anthropogenic phosphorus input and its impact on total phosphorus flux in the Chaohe River basin
To quantify the long-term net anthropogenic phosphorus input(NAPI)and its impact on total phosphorus(TP)flux,this study estimated the NAPI and TP flux in the Chaohe River basin from 1995 to 2014 and attempted to identify their driving factors.The results showed that the NAPI in the Chaohe River basin from 1995-2014 was 4.93-10.74 kg·hm-2·a-1,with an annual growth rate of 4.01%.The NAPI showed a spatial pattern of high in the south and low in the north.In addition,more than 90%of the NAPI was from fertilizer and food and feed consumption.Changes of the TP flux in the Chaohe River were mainly related to river flow.The average annual TP flux of the Chaohe River was 1.70×10-2 kg·hm-2·a-1.The reduction of the phosphorus export ratio(TP/NAPI)was mainly due to an intensive retention effect of the soil and sediment induced by a hydroclimatic influence on the phosphorus transportation process.More attention in the phosphorus management strategy should be given to collaborative management of phosphorus input and retained phosphorus.
Chaohe River basinnet anthropogenic phosphorus input(NAPI)river total phosphorus flux
国家科技期刊平台
NSTL
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