Study On Vegetation Restoration Evaluation At Initial Operation Stage Along The Golmud-lhasa Section Of Qinghai-tibet Railway

The Qinghai-Tibet Plateau, birthplace of many big river and importantcenter of origin of mountainous biological species, the ecologicalenvironment of which is original, unique and fragile. Construction ofQinghai-Tibet railway was facing fagile ecosystem, alpine hypoxia andpermafrost, which were three world-class problems in the process ofconstruction of Qinghai-Tibet railway. Because of its fragile ecosystem,ecological protection had attracted lots of attention, and vegetationprotection is the most important content of ecological protection.Relying on the project of post-EIA of Golmud-Lhasa section ofQinghai-Tibet railway, this article had analyzed and reviewed of theconstruction effect on the alpine vegetation, the situation of vegetationprotection and restoration measures. According to the suitable siteconditions, restoration measures and the basis theory of the theGolmud-Lhasa section of Qinghai-Tibet Railway vegetation recovery, thispaper had carried out dynamic analysis of landscape patterns andvegetation type and growth on the whole Qinghai-Tibet railway, the keyareas (Nachitai-Wudaoliang section, Tuotuohe-Tanggula section and Naqu-Dangxiong section) and highly sensitive region (Tsonag section) by themethod of data requisition, field investigation and RS analysis. Finally,this paper had studied on vegetation restoration evaluation of initialstage of the Golmud-Lhasa Section of Qinghai-Tibet Railway Operation. Themain results are:1. Vegetation restoration measures of Qinghai-Tibet railway were verysuccessful, whether vegetation individual or community indices were allwell, and the effect of ecological restoration and landscape were obvious.2. The full range of landscape style along the railway had not changedsignificantly; the external environment was also stable. The grasslandarea had decreased, sand (bare) land area had increased, but the variations were very weak, which indicated that the land along theQinghai-Tibet railway were degrading; Artificial land area had increased,which illustrated that the railway had promoted the urban development;Patch number of grassland had decreased and the largest patch hadincreased significantly, which indicated that the whole fragmentation ofgrassland landscape had been weaken and the connectivity had beenenhanced.3. The restoration vegetation indices of coverage, biomass andspecies diversity were very good in the south of Tanggula Mountain. Theseindices in the north of Tanggula Mountain were not as good as in the southof Tanggula Mountain, but their community structure showed steady, whichwere consistent with natural succession law.4. Elymus nutans, Leymus, crymophila Bluegras and Chiese Festuca,which are common perennial plants in high elevation and arid regions ofthe Qinghai-Tibet Plateau, have the characteristics with droughtresistance, cold resistance, wind resistance and salt resistance. Theyhave the perfect daptability to adpat the climate environment of theQinghai-Tibet Plateau which makes them excellent pioneer plant forsecondary bare land. They should be promoted in vegetation recovery inthe future, and the vegetation community will be more stable with severalplant mixed sowing.This paper has carried on the appraisal to the vegetation restorationof Initial Stage of the Golmud-Lhasa Section of Qinghai-Tibet RailwayOperation, which provide theoretical support and experience guidance forthe vegetation restoration work for bare land on the Qinghai-Tibet Plateau;It also to provide reference for the project construction of vegetationrestoration on the Qinghai-Tibet Plateau. It also has certain promotionapplication and providing reference guides to surrounding projectconstruction.