Journal
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
Volume 295, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.agee.2020.106919
Keywords
Agricultural non-point source pollution; Slopping land/paddy field/hydro-fluctuat belt eco-system; Three Gorges Reservoir Areas
Funding
- National Natural Science Foundation of China [41907062]
- National Key RAMP
- D Program of China [2018YFD0200500]
- Fundamental Research Funds for the Central Universities [XDJK2017C085, SWU116048]
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Agricultural non-point source pollution (NPSP) is becoming a severe threat and seriously restricting the sustainable development of agricultural economy and rural environment in the Three Gorges Reservoir Areas TGRA). However, limited studies have focused on agricultural NPSP management in TGRA, especially for integrated technology systems with TGRA characteristics. An integrated slopping land/paddy field/hydro-fluctuation belt eco-system (SPHES) was constructed using best management practices in this study. Evaluation results of the SPHES at the comprehensive test demonstration zone showed that ecological engineering interception technologies on slopping land can reduce 80-90 % of sediment, 20-30 % of nitrogen (N), and 25-35 % of phosphorus (P), respectively. The utility of interception and absorption technology under ridge cropping pattern in paddy fields can effectively control inorganic N in sewage and P in external sewage within one week. Biological sequestration technologies of N and P in hydro-fluctuation belt can intercept 30-50 % of total N, 65-95 % of total P, and 75-90 % of sediments. In summary, the comprehensive removal rate of pollutants in agricultural NPSP exceeded 89 % using this eco-system. The work presented here provides the construction of this integrated eco-system for agricultural NPSP controlling, thereby applying to all small watersheds in the TGRA to control and manage agricultural NPSP. This integrated technology system has broad prospects for promotion and application in similar ecological areas.
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