基于物质循环的河道内生态用水价值及其能值评估

水生生态系统的生态服务价值主要是伴随着水循环、碳循环、氮循环的过程而实现的。水循环伴随的生态服务价值包括调节气候价值、输送价值、水体自净价值;碳循环伴随的生态服务价值包括净初级生产力、生物量;氮循环伴随的生态服务价值包括生物多样性保护价值、水污染损失。针对河道内生态用水不同组分量纲不同,采用能值统一度量水生生态系统生态服务价值,以郑州市水生生态系统为研究对象,计算其2011年生态服务价值为3.16×1020sej,各项服务价值从大到小顺序依次为:输送价值调节气候净初级生产力生物多样性保护生物量水体自净水污染损失,分析其优势和薄弱环节。研究成果可为水生态修复提供决策依据。

Value of instream ecological water use and the emergy evaluation method based on material cycle

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.