Study Of Vegetation Recovery Along The Qinghai-Tibet Railroad

Qinghai Tibetan plateau which Qinghai Tibetan Railway goes through is an unique systenm, with high altitude, rare air, cold clamatie, draught, difficult site, the slow process of material cycling and energy exchange, and the sensitive and fragile environments. In this paper, vegetation characters had been researched along the Qing-Tibetan railway.The vegetation types and characters were researched in detail. The results are the followings:there are 5 kinds of vegetation types along the Qinghai-Tibetan railway. They are deserts, grassland, meadows, marsh and alpine shrub, including warm deserts, alpine deserts , alpine grassland, alpine meadow grassland, warm grassland, alpine meadows, swamp meadow, marsh, hemi hygroscopicity alpine shrub and arid alpine shrub 10 vegetation subtypes.The dominant species and plant diversity were researched.There are 289 species and varietyies in the vegetation transects along the Qinghai-Tibetan railway, including 22 species of shrub, 267 species of herb, and they belongs to 39 families and 134 genuses; And the species of dominant species are relatively less, there are 40 species in all, including 4 species of shrub; Some dominant species were singled out, and they deserve paying more attention in vegetation recovery in the future.vegetation regionalizations were made by adopting " vegetation coenology------ecology classify"and β-diversity index method.in the process, the dominant species, climate, topography and landform were synthetically considered.6 vegetation regions are classified.They are desert region, Alpine grassland region, Secondary alpine grassland region, Alpine meadow region, The alternatve belt of alpine meadow and alpine grassland and Shrub-grassland region.The distribution of precipitation, surface water and ground water were researched. The precipitation is notable in regeonal difference, in principle, it presents 3 obvious deffirent precipitation step. And the surface water can also be separated into 5 drainage network. And the ground water can be divided into 3 segments too.The situation of soil humidity and soil temperatures along the Qinghai-tibetan railway were researched. The results indicate that:The soil humidity is higher than which in Areas of Low Elevation in our country. But as in same high altitude step, the rule of the soil humidity is just like the precipitation', and the soil humidity is similar in 0-20cm soil horizon to 20-40cm soil horizon; and in the summer, the soil humidity is high enough to make vegetation recovery.Andt he soil temperatures is suitabale for majority vegetation to grow up. vegetation characters inside and outside 4 fenceing test fields at 400km section from lasha to naqu along the railway were analyzed. The following conclusions can be drew.The palatable Herbage Plants are obviously more inside the fenceing test fields than inside, but the unpalatable Herbage Plants are on the contrary. It conform to the law of over grazing succession. When it comes to dominant species, height, specie richness and α-diversity indexes are higher inside the fenceing test fields than outside, but the Vegetation Cover , IV and frequency of dominant species is lower.select dangxiong stop as the typical stop, and based on the specific condition, the guidance thoughts, expected target and overall landscape arrangement were made. A guiding principle of vetation recovery was put forward. And many native plant species were explored for vetation recovery, which have great application prospect.Eight constructivecountermeasures were single out for vegetation recovery along the Qinghai-Tibetan railway.At last the check list of plants along the Qinghai-Tibetan railroad ws listed out.