Abstract
Low-covered vegetation is one of typical vegetation patterns in arid and semi-arid areas of China through a long term nature succession.These vegetation types consist of a lot natural sparse woodland and shrubbery,the sandland is under semi-shifting and semi-fixing.However,we found that at low vegetation coverage,the horizontal distribution pattern of trees and shrubs can have marked effects on fixation of shifting sands,and different horizontal distribution patterns have the different restoration degrees of the soil and vegetation.In this paper,for clarify impacts of low-covered sand fixing forest belts on natural vegetation restoration and soil development,the variation and rule of soil nutrients and vegetation with different distribution patterns were researched in Aohan,Chifeng City,Inner Mongolia.The characteristics of community and structure,the physical and chemical characteristics of soil,the amount of soil microbes in different distribution patterns were investigated.The data obtained from the experiment were analyzed with the principal components,the canonical correlation and fuzzy comprehensive evaluation,which obtain coefficient of different recovery scale.Results show: Belt scheme of populus sand fixing forest could improve the interband vegetation and soil rehabilitation effectively;vegetation and soil rehabilitation depend on distance between neighboring belts,and interval distances of neighboring belts can adjust the effect between the vegetation and soil,due to sand-fixation forest planting of narrow spacing with a higher density would inhibited this effect.In wide distance scheme forest,the silt and clay content of soil significantly increased;the soil coarse particle content and bulk density were significantly decreased,soil moisture content was increased;the soil nutrient content was higher in wide distance between the belts than in narrow distance between the belts,and the pH of wide distance between the belts is more closer to the zonal soil.The total number of microorganisms was significantly higher in wide distance between the belts than in narrow,which was conducive to growth of vegetation;the variation trend of root biomass,total length and surface area showed 20m15m10m.When the distance between the belts increased,the composition of community species was gradually complex and quantity increased;the index of diversity and above-ground biomass of community increased gradually,and the similarity coefficient of community in the different recovery scale was a rising trend with grassland recovery,which was showed that 20m15m10m.Suitable distance between the belts will rehabilitate significantly,the effect on vegetation recovery of distance between bands of 20m sanded forest was better than those others of 15m and 10m;according to the fuzzy comprehensive evaluation of vegetation and soil,the vegetation and soil restoration scale between the belts of 20m interval,15m interval and 10m interval populus forest were current control 68.63%,55.01% and 42.04%.So belt scheme can significantly speed up the soil and vegetation restoration,thereby shortening the time of the soil and vegetation restoration if the distance between neighboring belts is appropriated.
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