| Barriers and countermeasures to them in vegetation rehabilitation in hilly and gully regions of the Loess Plateau located in North Shaanxi |
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| DOI：10.7606/j.issn.1000-7601.2007.04.09 |
| Key Words: Loess plateau hilly and gully region vegetation rehabilitation tree species density |
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| Abstract: |
| Concrete problems occurring in farmland conversion into forestland and grassland and vegetation rehabilitation of Zichang County were field investigated and analyzed in combination with the local natural environmental conditions and previous research results in vegetation construction, and we discussed the technique system of vegetation rehabilitation in hilly and gully regions of the Loess Plateau. The results showed that farm conversion into forestland and grassland in hilly and gully regions of the Loess Plateau should pay adequate attention to local rainfall as well as combining economic benefits with ecological benefits. Its implementation should stress that (1) the compositions of arbors, shrubs and grasses should be arranged according to the local original vegetation compositions, and locally adaptable tree species (poplar, willow, apricot, elm and birch-leaf pear) should be arranged in acacia-dominated arbor forests; (2) Drought-tolerant arbor species should be planted in valley lands and north-facing slope lands, which have relatively favorable moisture, shrub and herbaceous plant species should be planted on ridge and mound tops, sub-shrubs and shrubs should be planted in upper valley and slope sections, and human disturbances should be avoided as much as possible on slope lands with a high gradient so that the vegetations will recover naturally; (3) Where trees are planted in autumn, the initial planting density of arbor trees should not surpass 2 300 trees/hm2 and the density of adult forests should be kept at about 1 100 trees/hm2; (4) Sapling nurseries should be constructed to improve sapling qualities and realize local supply of saplings necessary for afforestation so that the survival rates of planted trees will be increased. |
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