Ecosystem Health Assessment Of Shapotou South Yellow River Irrigation District Based On Evidence-based Practice

The process of oasisization has expanded and built artificial oasis on a large scale,which has promoted the rapid development of society,economy and ecology,but human activities have also caused some ecological and environmental problems.This study uses evidence-based practice methods,document-based evidence-based ecosystem health assessment methods and oasis ecological risk sources,and conducts an evidence-based assessment of ecosystem health in typical Yellow River diversion and Yellow River irrigation areas from three levels:questionnaire,landscape features,and soil elements Obtain the true health status,and the evaluation and comparison of different evidences also provide new methods for ecosystem health evaluation.The evaluation of the ecosystem health of the Yellow River South Irrigation District in Shapotou is carried out through the three aspects of evidence from questionnaire evidence,landscape pattern evidence,and soil element evidence.The main research results and conclusions are as follows:(1)The questionnaire evaluation showed that the ecological system health impact of the Yellow River South Irrigation District in Shapotou was at a non-impact level;the landscape and soil element health risk evaluations were both at medium risk,and the high-risk areas were clustered in the old irrigation area in the north of Xuanhe Town;The distribution of health risks of soil salinization is that the old irrigated areas are higher than the new irrigated areas,and the health risks of land desertification and soil fertility are lower than that of the new irrigated areas.Combining questionnaires and experimental evidence to construct a health risk assessment system for the Shapotou Yellow River South Irrigation District,the overall health risk of the Shapotou Yellow River South Irrigation District is calculated to be 2.93,which is at a medium risk.According to the percentile system,the Shapotou Yellow River South Irrigation District’s ecosystem health score is calculated as 48.15,in sub-health.(2)The literature evidence-based,experimental evidence,and questionnaire evidence are unified and compared.In the literature-based evidence,soil salinization and land desertification,which are highly harmful,have weak negative effects in the questionnaire;in the literature evidence-based Hazardous soil fertility status,low income of farmers,river landscape quality,production and living garbage,species diversity,water utilization efficiency issues,in the questionnaire are biased towards no impact;evidence-based literature has hazardous water and soil pollution,pesticides Fertilizer pollution,water shortages,natural disasters,natural vegetation degradation,and farmland abandonment are all biased towards weak positive effects in the questionnaire;among them,soil salinization,land desertification,and soil fertility are shown as moderate risks in the experimental evidence.,Lower risk,higher risk.(3)Applying evidence-based practices to the field of ecosystem health evaluation can improve the operability,comprehensiveness and authenticity of ecosystem health evaluation.Ecosystem health assessment methods based on evidence-based literature can be applied to each ecosystem health assessment based on actual conditions.The evidence-based literature on oasis ecological risk sources can accurately locate the most prone ecosystems in the study area and the same type of ecosystem.problem.Secondly,the diversification of evaluation evidence acquisition channels and the multi-level evidence system ensure the comprehensiveness of the evaluation.In the process of systematic evaluation,the evidence of experiencers and stakeholders may bias the evaluation results.Therefore,evidence-based practice is applied to the field of ecosystem health evaluation,and comprehensive evaluation through a multi-faceted evidence evaluation system can well make up for the traditional singularity.Bias of evaluation.Based on the evidence-based ecological system health assessment path,this study selected the landscape pattern-based ecosystem health risk assessment and the soil element-based ecosystem health risk assessment to obtain experimental evidence;at the same time,the literature review of oasis ecological risk sources was carried out.The evidence obtained the relevant research results of domestic and foreign scholars,accurately positioning the ecological problems that are most likely to occur in the arid and semi-arid oasis;according to the evidence-based ecological problems,the questionnaire was designed to obtain expert knowledge and empirical evidence;finally,the experts were targeted Knowledge and empirical evidence and experimental evidence choose the same and most urgent ecological issues to construct an evidence-based evaluation system for ecosystem health evaluation,and the weights are determined by the potential hazards of oasis ecological risk sources based on literature-based evidence,and ensured in accordance with evidence-based evaluation methods The objectivity of the evaluation.