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• W2355811770 abstract "Dzungaria Basin,located in Northern Xinjiang,is one of the desert regions in China with a mid-latitude arid climate where the mean annual precipitation is around only 70-150 mm.The ecosystems in the basin are extremely fragile to resist any severe disturbance.With the exploitation and exploration of oil and gas resources,parts of the ecosystems in Dzungaria Basin have been degraded or even damaged.In order to provide background data for restoring the damaged desert ecosystems,a survey of the desert vegetation to reveal its relationships with environment factors was conducted in the basin.33 sampling plots,with each 10 m×20 m in size and following the contour of the land,were set up at the typical transect with distinct environmental gradients along 88°E across the Dzungaria Basin.The species and coverage of trees and shrubs of desert vegetation were surveyed in each plot.Each plot was further sub-divided into fifty 2 m×2 m quadrats,and the species and coverage of herbs were then surveyed in three randomly selected quadrats per plot.Meanwhile,the environmental data of the 33 plots,including ground activity,relative altitude,ground slope,slope aspect,and physical-chemical features of topsoil like total salts,pH,organic matter,water content,medium-coarse grain and clay grain,etc.were collected.The quantitative ordination and classification approaches as DCCA and TWINSPAN were used to analyze the collected species and environmental data so as to explore and reveal the distribution pattern of plant community influenced by environmental factors.The results were shown as follows.(1) There are two main types of desert vegetation sparsely distributed along the transect.One is Formation Haloxylon persicum scattered on mobile and semi-mobile dunes,while the other is Formation Haloxylon ammodendron emerged only on fixed and semi-fixed sandy land.Those two main vegetation types can be further divided by TWINSPAN until the sixth level into 12 vegetation groups,each of which shows more or less distinct features including distribution preferences from others.35 dominant plant species can be roughly divided into two categories,namely the inner and the outer species of the basin,at first level by TWINSPAN.The inner species can be further divided into species on the upper or the lower slopes of dunes,and the outer species can be further divided into categories of xerophyte,mesophyte and halophyte at second level by TWINSPAN.(2) The ordination results of the 33 plots with 35 dominant plant species by DCCA showed the distribution pattern of plant communities changed apparently with the gradient of environment factors.The first axis of the DCCA ordination chiefly reflected the gradient of soil water content,and the second axis mainly related to soil structure gradient,which indicated that of all the environmental factors examined,soil water content and relative altitude(or ground activity) were the two most prominent environmental factors controlling the community distribution pattern.(3) Apart from relative altitude(ground activity) and soil water content,soil salinity also emerged as an environmental factor stressing vegetation,especially at the marginal zone of piedmont diluvial fans in the southern fringe of the desert.Soil texture was another factor influencing the vegetation features as well as distribution,particularly in the gobi plain along the northern outskirt of the desert.Meanwhile,soil texture and dune slope also contributed to the plant distribution pattern in inner desert as two extra environmental gradients.(4) Significant correlations can be found between relative altitude and ground activity,between soil organic matter and soil clay content,or between soil water content and total soil salts,pH,relative altitude,and soil organic matter in Dzungaria Basin." @default.
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• W2355811770 date "2011-01-01" @default.
• W2355811770 modified "2023-09-23" @default.
• W2355811770 title "Relationships between plant community characteristics and environmental factors in the typical profiles from Dzungaria Basin" @default.
• W2355811770 hasPublicationYear "2011" @default.
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