基于生态系统质量的水源涵养服务评估——以西南五省为例  

Water Conservation Service Evaluation Based on Ecosystem Quality in Southwestern China

作　　者：沈钰仟 肖燚[1] 欧阳志云[1] 张平[3] SHEN Yuqian;XIAO Yi;OUYANG Zhiyun;ZHANG Ping(State Key Laboratory of Urban and Regional Ecology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;College of Research and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;College of Environment and Chemical Engineering,Xi'an Polytechnic University,Xi'an 710048,China)

机构地区：[1]中国科学院生态环境研究中心城市与区域生态国家重点实验室,北京100085 [2]中国科学院大学资源与环境学院,北京100049 [3]西安工程大学环境与化学工程学院,西安710048

出　　处：《山地学报》2020年第6期816-828,共13页Mountain Research

基　　金：国家重点研发计划(2016YFC0502102)。

摘　　要：水源涵养服务评估是生态系统服务评估的重要内容之一。水量平衡法是水源涵养模拟评估常用的方法之一,然而以往的多数研究由于没有考虑到生态系统质量差异对水源涵养服务带来的影响,在一定程度上影响了水源涵养服务评估的精度。本研究以西南五省为例,基于水量平衡原理,使用不考虑生态系统质量的水量平衡法、基于叶面积指数的水量平衡法、基于生物量与植被覆盖度的水量平衡法,进行了水源涵养服务的评估精度的比较研究。通过对比验证三种考虑不同生态系统质量参数的方法与水文实测数据的结果发现:三组数据配对t检验差异显著性结果均为P>0.05,三组结果均无显著性差异;基于生物量与植被覆盖度的水量平衡法评估结果与实测结果相关系数最高,为0.982(P<0.001),说明三种方法中,基于生物量与植被覆盖度的水量平衡法更能准确地反映出当地生态系统的水源涵养服务功能,其次为基于叶面积指数的水量平衡法,不考虑质量参数的水量平衡法评估结果与实测结果相关性最低。研究结果可为未来基于不同研究目的水源涵养评估方法提供参考,并为水源涵养服务评估体系的优化提供思路。Water conservation is an integral part of ecosystem services evaluation.While water balance equations are widely used in water conservation service assessments,many ignore the impacts of ecosystem quality,which can lead to assessment inaccuracy.In this study,three water balance methods were used to assess water conservation services in five provinces in southwestern China,in order to conduct a comparative analysis of evaluation accuracy.The three methods are as follows:Method Ⅰ built on the conventional water balance principle without consideration of ecosystem quality;Method Ⅱ took the leaf area index(LAI)as an adjustor;Method Ⅲ used biomass and vegetation coverage as an adjustor.The results were compared with measured hydrological data.We found that there was no significant difference between the three groups using a paired t-test(P>0.05).Among the three methods,Method Ⅲ had the highest correlation coefficient at 0.982(P<0.001),which means Method Ⅲ can most accurately reflect the water conservation service function of local ecosystems.Method Ⅱ had the second highest correlation coefficient,while Method Ⅰ showed the lowest correlation compared to measured hydrological data.These findings can provide reference for future water conservation assessment methods based on different research purposes.In addition,this study contributes insights for the optimization of water conservation services.

关 键 词：水源涵养服务 水源涵养量 生物量 植被覆盖度 西南五省 

分 类 号：Q148[生物学—生态学]