期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 49, 期 24, 页码 13973-13982出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b03202
关键词
-
资金
- Natural Science Foundation of China [41222012, 71303005, 41401652]
Understanding historical patterns of phosphorus (P) cycling is critical for sustainable P management and eutrophication mitigation in watersheds. This study built a bottom-up model using the substance flow analysis approach to quantify P cycling in the Chaohu watershed during 1978-2012. We found that P flows have been intensified, with a 5-fold increase of annual P inputs to sustain the expanding intensive agriculture. Annually, most P inputs (75%) were stored within the watershed, which caused accelerating buildup of legacy P in cultivated land (from 4.9 Gg to 6.5 X 10(2) Gg), uncultivated land (from 2.1 Gg to 1.3 x 10(2) Gg) and surface water (from 3.7 Gg to 2.6 X 10(2) Gg) during 1978-2012. The main legacy P sources include fertilizer application for cultivated land, phosphogypsum abandonment for uncultivated land, respectively. The animal husbandry contributed about 63-66% of total P inputs to surface water. The contribution of animal food-P increased greatly during 1978-2012, from 7% to 24% and from 1% to 8% for urban and rural residents, respectively. This work demonstrates principle for the buildup of legacy P at the watershed-scale, and advances the knowledge of sustainable P management, such as improving agricultural technologies to reduce fertilizer application.
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