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• W2365136007 abstract "The Loess Plateau region in China is an ecologically fragile zone, where large-scale vegetation restoration has been undertaken in recent years. How to determine the reasonable proportions of trees, shrubs and grasses is an issue important both in theory and in practice. The natural vegetation primary productivity (NPP) is adopted to reflect the maximum probable or potential vegetation conditions, and then it is compared with the present forest cover and the existing tree-shrub-grass compositions of the soil-water conservation vegetations. Based on data from more than 200 counties in the Loess Plateau region, the relationship between annual precipitation and forest cover percentage has been established, from which some thresholds have been identified. Natural vegetation indexed by NPP in the Loess Plateau region shows a clear zonal distribution. Two thresholds exist in the relationship between NPP and mean annual precipitation (P_m), corresponding to the change from one vegetation type to another. P_m=250 mm can be regarded as the threshold between desert vegetation and steppe, and P_m=480 mm the threshold between steppe and forest. Although the soil-water conservation vegetation is man made, some self-adjustment mechanism operates in this artificial vegetation system and leads the system to a balance between water supply by precipitation and water demand of vegetation. Therefore, the annual precipitation is still the major control on the cover percentages of the existing, mainly artificial forest. A threshold appears at P_m=480 mm; when P_m is lower than 480 mm, forest cover percentage (C_f) is very low and the rate at which C_f increases with P_m is also low. When P_m is larger than 480 mm, the rate at which C_f increases with P_m increases sharply. The man-made soil-water conservation vegetation can be regarded as a self-organized system. Through self-adjustment, it tends to establish some balance between water and plants, and thereby the optimal proportions of trees, shrubs and grasses in the system can be realized. Starting from this, a simple method based on empirical data has been proposed to determine the reasonable ratio of tree area to the total area of water-soil conservation vegetation including trees, shrubs and grasses. Using this method, some results have been given, which may propose some reference for the vegetation restoration planning in the Loess Plateau region." @default.
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• W2365136007 modified "2023-09-25" @default.
• W2365136007 title "Threholds in vegetation-precipitation relationship and the implications in restoration of vegetation on the Loesee Plateau,China" @default.
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