西气东输管道沿线河西走廊地区生态系统评价与生态安全保障体系建设

doi:10.13826/j.cnki.cn65-1103/x.2003.04.003

Abstract

Abstract: Because the Hexi Corridor Region along WEPP is typical of desert-oasis-Gobi region with vulnerable environment for all kinds of ecotones such as dry-wet ecotone,agro-pasture ecotone,forest edge region and desert edge region,WEPP will bring destruction to vegetation and soil of the region,aggravating desertification, inducing sandstorm,deteriorating the regional ecological environment and endangering the safety for the running of WEPP.So it is very important to build ecological security system for both ecological safety and pipeline safety.Based on the Arcview GIS platform,main ecosystems are identified along the pipeline within10km on each side,and ecosystem assessment is focused on the main 3ecosystems：Gobi Gray-brown-desert soil sem-i andshor-t shrub desert ecosystem taking account of 34.65％ of the total assessing area,oasis ecosystem with 20.58％,and the barren land ecosystem with19.43％,So the ecological security systems are aiming at these ecosystems,which is important to both ecological security for the region and the safety running for WEPP.
The desert systems are divided into two kinds of transferring zone：middle-low hill areas and desert area, and Straw lattice design (30m wide） is used in the desert area,but to the former,the main problem is the gravity erosion,and the gully detention project and fixation project of gully should be done.The oasis ecosystems are divided into three zones：small areas of sand land and sand dunes area,farmland area and ecotone area,and to the first one,gravels are used for pipe gully burying preventing sands from erosing,and two belts on the sand dunes are sand barrier and artificial bush belt and natural restoration belt; to the second one,the main measure is that soil be excavated and buried on layers; to the third one,three belts designed according to the distances away from the pipeline are sand barrier belt (0~5m）,sand barrier and artificial bush forest belt (5~50m） and the closing belt for reservation (50~1000m） in the Gobi area,and the opposite three belt in the oasis are grass planted belt (0~50m）,artificial bush forest belt (5~50m） and the closing belt for reservation.The Gobi Graybrown-desert soil Sem-i and-short-shrub desert ecosystems are divided into two kinds：Gobi plain area and mountain front Gobi area,and to the former,on each side of the pipeline,three belt designed are gravel barrier belt (0~5m）,artificial enclosed grass belt (5~50m） and natural restoration belt (50~500m）,to the latter a ridge on the pipe built to reserve water for the recovery of vegetation,and three belts designed are current collector belt for restoration and project belt for restoration.Along the ridge,flood discharge passages be built every some distances.

Key words: WEPP, Hexi Corridor, Ecosystem assessment, Ecological security

CLC Number:

X171

GAO Qi-chen, CHEN Li-ding, JIANG Chang-liang, LI Guo-qiang, QIU Jun, GAO An. Ecosystem Assessment and Ecological Security System Design for Hexi Corridor Region along the West—East Gas Pipeline Project (WEPP）[J].Arid Land Geography, 2003, 26(4): 309-315.

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Ecosystem Assessment and Ecological Security System Design for Hexi Corridor Region along the West—East Gas Pipeline Project (WEPP）

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