Planting trees was used as one of cost-effective measures for desertification control in add and semi-add areas of China. Woodland degradation, however, is becoming an inevitable issue in these areas. In this paper, a...Planting trees was used as one of cost-effective measures for desertification control in add and semi-add areas of China. Woodland degradation, however, is becoming an inevitable issue in these areas. In this paper, a typical county, Ejin Holo County, Inner Mongolia, China was selected for its assessment of artificial woodland degradation. A conceptual model for woodland degradation was delineated qualitatively based on field sampling survey, and four model-based indicators as humidity index （HI）, vegetation index （NDVI）, soil type （ST） and soil erosion modulus （EM） were screened out and used to a GIS-based method for artificial woodland degradation assessment in this semi-add agro-pastoral transitional area. All the indicator layers were overlaid and desertification assessed using simplified equation with equal weights for each indicators. The assessment results showed that in 336. 09 km^2 of total woodland area, 311.35 km^2 woodland were under degradation, and the area for slight, medium, severe degradation was 78.97, 119.73 and 112.65 km^2, respectively. It was suggested that much attention should be paid on woodland improvement and plant species selection, especially shrub species, before revegetation in similar areas.展开更多
This research work took into account two extracting areas that were used in the construction of the road between Pirayu and Yaguarun in Paraguay and describes the situation in the area taking into account the current ...This research work took into account two extracting areas that were used in the construction of the road between Pirayu and Yaguarun in Paraguay and describes the situation in the area taking into account the current related legislation. Signs of degradation have been observed, such as erosion in progress, compacted soil, scarce vegetative repopulation and lack of organic matter necessary to regenerate the flora, among others. Includes an analysis of the techniques applied in similar cases of degradation in other countries and those techniques that show more compatibility with the conditions of the areas under study have been selected; alternative rehabilitation techniques in road bank areas and surrounding surfaces are also recommended. The goal is that the selected areas will blend in with the landscape and will resume similar conditions to the surrounding landscape in a medium tenn. The most compatible techniques that were found were the reshaping of road banks in the degraded areas and the insertion of herbal species for the proposal for the implementation of bioengineering and soil improvements including the introduction of hardwood species after the insertion of herbal species.展开更多
基金This paper is funded by National Natural Science Fund (30171205) and National Tenth-year-plan Key Sci&tech Project (2005BA517A04)
文摘Planting trees was used as one of cost-effective measures for desertification control in add and semi-add areas of China. Woodland degradation, however, is becoming an inevitable issue in these areas. In this paper, a typical county, Ejin Holo County, Inner Mongolia, China was selected for its assessment of artificial woodland degradation. A conceptual model for woodland degradation was delineated qualitatively based on field sampling survey, and four model-based indicators as humidity index （HI）, vegetation index （NDVI）, soil type （ST） and soil erosion modulus （EM） were screened out and used to a GIS-based method for artificial woodland degradation assessment in this semi-add agro-pastoral transitional area. All the indicator layers were overlaid and desertification assessed using simplified equation with equal weights for each indicators. The assessment results showed that in 336. 09 km^2 of total woodland area, 311.35 km^2 woodland were under degradation, and the area for slight, medium, severe degradation was 78.97, 119.73 and 112.65 km^2, respectively. It was suggested that much attention should be paid on woodland improvement and plant species selection, especially shrub species, before revegetation in similar areas.
文摘This research work took into account two extracting areas that were used in the construction of the road between Pirayu and Yaguarun in Paraguay and describes the situation in the area taking into account the current related legislation. Signs of degradation have been observed, such as erosion in progress, compacted soil, scarce vegetative repopulation and lack of organic matter necessary to regenerate the flora, among others. Includes an analysis of the techniques applied in similar cases of degradation in other countries and those techniques that show more compatibility with the conditions of the areas under study have been selected; alternative rehabilitation techniques in road bank areas and surrounding surfaces are also recommended. The goal is that the selected areas will blend in with the landscape and will resume similar conditions to the surrounding landscape in a medium tenn. The most compatible techniques that were found were the reshaping of road banks in the degraded areas and the insertion of herbal species for the proposal for the implementation of bioengineering and soil improvements including the introduction of hardwood species after the insertion of herbal species.
