Development of a landscape index to link landscape pattern to runoff and sediment  

作　　者：SHI Peng QIN Yan-li LI Peng LI Zhan-bin CUI Ling-zhou 

机构地区：[1]State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi'an University of Technology,Xi'an 710048,China [2]Key Laboratory of National Forestry Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xi'an University of Technology,Xi'an 710048,China [3]Northwest A&F University,Yangling 712100,China [4]College of Life and Environmental Science,Wenzhou University,Wenzhou 325035,China

出　　处：《Journal of Mountain Science》2022年第10期2905-2919,共15页山地科学学报（英文）

基　　金：funded by the Project of Creating Ordos National Sustainable Development Agenda Innovation Demonstration Zone(Grant 2022EEDSKJXM005);National Natural Science Foundation of China(Grant 42077073);Natural Science Basic Research Plan in Shaanxi Province of China(2022KJXX-62);Project of Shaanxi Provincial Transport Department(2015-11K)。

摘　　要：Linking landscape indexes to ecological processes is the key topic of landscape ecology.However,traditional landscape metrics based on the Patch-Mosaic Model have no ecological significance.In this study,the runoff-sediment landscape index coupling land use,topography,soil,and vegetation factors was constructed to link landscape patterns to runoff and sediment.In the study area,the runoffsediment landscape index at the class scale showed an increasing trend from 0.10 in 1995 to 0.26 in 2015.Cropland had a higher runoff-sediment landscape index compared to grassland or forestland.At the landscape scale,the runoff-sediment landscape index showed a decreasing trend since 1995;furthermore,it decreased by 36.24%in 2015 compared with the index in 1990.The runoff-sediment landscape index had higher correlations with runoff and sediment compared with traditional landscape metrics.Redundancy analysis showed that the runoffsediment landscape index had a higher contribution to runoff and sediment compared to traditional landscape metrics,explaining 90.1%of the variability.The soil erosion risk assessed by the runoff-sediment landscape index showed an increasing trend upstream of the Dali River watershed.More attention should be paid to this area in future vegetation restoration attempts,as exploring the impact of landscape pattern changes on ecological processes,especially hydrological processes,plays an important role in comprehensive watershed management.

关 键 词：RUNOFF SEDIMENT Landscape index Process-oriented Soil erosion risk Landscape planning 

分 类 号：P901[天文地球—自然地理学] P333[天文地球—水文科学]