Abstract
In the present study,Jianhu,a typical degraded plateau wetland in Northwesten Yunnan,is selected as the study site and for the efficiency assessment of an ecological restoration project. The aim of the this study is to provide a scientific basis for restoring degraded wetlands and treating water pollution problems in Yunnan Plateau area,and to maintain ecological stability of associated lake ecosystems. The result showed that after two years' ecological restoration effort,estuarine landscape structure has been greatly improved with diversified landscape and optimized spatial structure. Also,water quality has been improved,with the transparency of the water body increased by 101%,and the concentrations of TN,NH+ 4-N,NO-3-N,TP and COD significantly decreased by 62.5%,89.3%,62.5%,91.7% and 68.0%,respectively.The purification process of water suggests that the sediment treatment has improved the hydrological conditions in the estuarine environment,and the selection of plant species should be based on nutrient content of the sewage. Also,a high proportion of submerge plants could be used to enhance purification effect. However,the purification effect varied for wetlands with different plant communities,which suggest that aquatic plants have different preference to nitrogen and phosphorus,and they have established complex interactions. Also,once exposed to different nutrient content,the same plant species could display varying levels of water purification function. Therefore,to better deal with sewage problem,it is essential to select the right plant species for community assembly purpose according to water pollution levels. Meanwhile,it is necessary to adjust the composition of plant community according to the change of water quality so that plants could grow well,the stability of the wetland ecosystem could be maintained,and the recovery of ecosystem functions and services could be sustained. After the degraded wetland is restored,it would offer multiple ecosystem services each year,with the yield value of the water purifying effect estimated as RMB 1850000 yuan,the yield value of biodiversity conservation,ecological tourism and other ecosystem services estimated as RMB 327000 yuan,and the market value of the ecological agriculture system estimated as RMB 2700000 yuan. Therefore,the comprehensive benefits of economy,society and ecology could be accomplished,and the goal of demonstrating restoration feasibility of a degraded plateau wetland is fulfilled.
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