Value of instream ecological water use and the emergy evaluation method based on material cycle
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Abstract:
As value of ecological water use is reflected by material cycle and energy flow in aquatic ecosystem, ecosystem services value is discussed from the perspective of water cycle, carbon cycle, nitrogen cycle. Ecosystem services value associated water cycle includes climate regulation value, delivery value and water self-purification. Ecosystem services value associated carbon cycle includes net primary productivity and biomass. Ecosystem services value associated nitrogen cycle includes biodiversity protection and water pollution loss. According to the dimensional difference of component parts for ecological water use, emergy method is used to evaluate ecosystem services value. Take Zhengzhou as a case study: its ecological value in 2011 is 3.16×1020sej, and the value from the great to the little is delivery value, climate regulation value, net primary productivity, biodiversity protection, biomass, water self-purification, water pollution loss. At last, the advantages and disadvantages is discussed, and decision-making basis is provided for water ecological recovery.
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