潇河流域灌区河流生态系统健康评价

Health Assessment of River Ecosystem in the Irrigation Area of Xiaohe River Basin

农业灌区河流生态系统评价是对流域生态进行有效管理的手段之一.潇河流域是山西省重要的农业灌区,受持续的农业活动影响,灌区河流生态系统健康受到严重威胁.以潇河流域灌区河流生态系统研究现状为基础,运用主成分分析法和层次分析法,构建了潇河流域灌区河流生态系统健康评价体系.结果表明,在所有28个地表水监测断面中,“健康”“亚健康”和“差”的断面个数分别为5、15和8,分别占总监测断面的17.86%、53.57%和28.57%,未发现“很健康”断面和“极差”断面.农业活动已对潇河流域灌区河流生态系统造成较大程度破坏,尤其是中下游流域,河流生态系统退化最为严重.研究结果可为农灌区河流—农业复合生态系统管理提供理论支持和决策参考依据.

Assessment of the river ecosystem is one of the effective management methods for watershed ecology.Xiaohe River Basin is an important agricultural irrigation area in Shanxi Province,and the health of the river ecosystem has been seriously threatened for many years.Based on the research status of the river ecosystem in the irrigated area of the Xiaohe River Basin,this paper constructed the river ecosystem health evaluation system in the irrigated area of Xiaohe River Basin by using principal component analysis(PCA)and analytic hierarchy process(AHP).The results showed that most of the monitoring sections belonged to sub-health level or above in the whole 28 surface water monitoring sections,with the number of“healthy”and“sub-health”sections of 5 and 15,accounting for 17.86%and 53.57%of the total monitoring sections,respectively.Notably,the number of“poor”sections is 8,accounting for 28.57%of the total monitoring sections.No“very healthy”or“extremely poor”sections were found in the study region.Agricultural activities have caused great damage to the river ecosystem in the irrigation area of Xiaohe River Basin,especially in the middle and lower reaches.The research findings will offer theoretical support and decision-making reference for the management of river-agricultural complex ecosystem in the irrigated area.