| In recent decades,population increased dramatically,social economic development and high strength development of resources bring ecological degradation which becoming a global problem and constitudes a serious threat for human survival and sustainable development.How to protect existing natural ecosystems, comprehensive regulation and repair degenerate decosystems , and reconstruction sustainable artificial ecosystem have become urgently to be solved before on human.Loess area as the most serious one of the soil and water loss areas in the world,its ecological system severely damaged,and recovery and reconstruction loess areas damaged ecosystem is the urgent task facing us in present.In order to curb the trend of ecological degradation in loess area,in many yreas,the county developed with a small watershed as a unit Comprehensive harness of soil and water conservation work and have achieved some results . This paper studies the classification of loess region, describes the characteristics of loess landform and physiognomy,classification of the loess landforms,divided into four kind which are mountain landform classes, hills landform class, loess tableland landform class and Valley of plain landform.This paper research loess features and loess stratigraphic classification and distribution ,also divisional the loess area according to climate, divided into five north temperate zones as climate warm temperate zone, south and north subtropical, warm temperate zone, the edge of the Tibetan plateau. Additional, it carried on the detailed narration on the loess areas moisture physical properties and soil moisture ecological zones.Region loess soil erosion situation and vegetation distribution in different climate area, different loess belt, different landform zoning each are not identical, so ecological restoration measures are also different. Based on different landscape, different climate, soil erosion of the loess strata different characteristic, the soil erosion intensity, vegetation characteristics, this paper classified researches, in view of the different natural conditions, different ecological restoration measures be carried on to achieve better effect of ecological restoration. Through this research better soil and water conservation measures is raised.This research provide scientific basis for exploring the region loess ecological construction,soil and water conservation manngement and decision-making,and it has important academic value and practical significance. |
