Evaluating the suitability of ecological restoration techniques in distinct ecoregions along the China-Nepal Highway

Abstract

Heterogeneous landscape environments can lead to varying effectiveness of ecological restoration techniques (ERT). Distinguishing heterogeneous landscapes for adaptive management in ecological engineering projects is key to maximizing their ecological benefits. This paper conducted a quantitative analysis of the effectiveness of different ERTs in the Effect Zone of the China-Nepal Highway. The study firstly divided the China-Nepal Highway Effect Zone into seven ecoregions using the SKATER spatial clustering algorithm. Seven spatial-physical factors, including annual average rainfall (RAIN), annual average temperature (TEMP), vegetation supply water index (VSWI), altitude, relief ratio (RR), slope (S), soil organic carbon (SOC), total nitrogen (TP), and total phosphorus (TP), are used for analysis, and watersheds are used as the smallest clustering unit. Secondly, an index system for evaluating the effectiveness of different ERTs was constructed, and the entropy weight method was used to determine the weight of each indicator. Furthermore, four evaluation methods, RSR, TOPSIS, VIKOR and FCE, were used to conduct a fuzzy Borda combined evaluation of the effectiveness of different ERTs at distinct ecoregions. The results suggest that the varying resilience of different ecoregions is likely the major reason in causing the differences in the effectiveness of ERTs. Lastly, we constructed an adaptive management system for ecological engineering projects along the China-Nepal Highway based on the spatial suitability of ERTs in each ecoregion.

Keywords

• Ecological restoration technique
• Landscape heterogeneity
• Fuzzy Borda combined evaluation
• China-Nepal Highway
• Adaptive management