This paper divides the process of rainfall redistribution into four levels in vegetation restored region of gully in arid-hot valley of Jinshajiang River. These levels include arbor interception, litter interception, ...This paper divides the process of rainfall redistribution into four levels in vegetation restored region of gully in arid-hot valley of Jinshajiang River. These levels include arbor interception, litter interception, soil interception and surface runoff. The results showed that the maximum of interception was 8.10 mm, the mean interception was 4.53 mm, the maximum of interception rate was 56.10 % and the mean interception rate was 32.63 %.When the rainfall is over 20 mm, the interception rate descends rapidly along with the rainfall increasing. The maximum of water-holding content of litter was 8.14-20.33 t/hm^2, the mean of which is 12.52 t/hm^2 and the maximum of water-holding content was over two times of it own weight. The rainfall of litter interception was 150.24 mm, accounted for the rainfall income 24.48%.The maximum water-holding capacity of soil achieves 2 198.54 t/hm^2, but that of the barren land is 1 825.60 t/hm^2. The rainfall of soil interception was 219.87 mm, accounted for the rainfall income 35.82%. The surface runoff of vegetation restored region was 43.41 mm, accounted for 7.07% of the rainfall income, but the surface runoff of non-forest land was 413,24 mm, accounts for 70.26% of the rainfall income.The surface runoff of the planted forest community was by 63.19% lower than that of the non-forest land. Through the interception of the forest land that reduced the soil erosion effectively, good hydrology effect was obtained.展开更多
In view of the environment character of the soil and content of the soil organic carbon, 278 species of grass and frutex were introduced from abroad and China, Some were selected by applied production and plantation b...In view of the environment character of the soil and content of the soil organic carbon, 278 species of grass and frutex were introduced from abroad and China, Some were selected by applied production and plantation benefit investigations. The results showed that： In the arid-hot valleys of Yuanmou the selected species showed the characteristics of fast growth and high yield （38 227.00 kg/hm2）, high nutrition value （CP% content of legu- minous grass and frutex were 22.47%）, as well as the strong ad- versity resistance to high air temperature and arid climate （soil humidity was 3.4%）. The selected species not only effectively meliorated soil and increased fertility, but also improved small environment weather.展开更多
The decomposition rate and the water-holding capacity of 6 kinds of grass litters were studied in the Jinshajiang river dry-hot valley. The results showed that the dry weight remains reduced with time but did not have...The decomposition rate and the water-holding capacity of 6 kinds of grass litters were studied in the Jinshajiang river dry-hot valley. The results showed that the dry weight remains reduced with time but did not have a direct correlation with time. The decomposition litters were affected by climate, character of litter, animalcule and soil animal. The climate factors of temperature and humidity were important especially. The water-holding capacity was in the sequence ofN. wightii （336%）, P. notatum Flugge （248%）, H. contortus （L.） Beauv （209%）, B. pertusa （L.） A. Camus（206%）, L endecaphylla Jacq （174%）, D. annulatum （Forsk.） Stapf （168%）. After 24 months decomposition the remaining dry weight of the litter was in the sequence as follows： 15.12% for N. wightii, 26.38% for I. endecaphylla Jacq, 27.23% for B. pertusa （L.） A. Camus, 30.78% for P. notatum Flugge, 39.72% for H. contortus （L.） Beauv and 39.76% for D. annulatum （Forsk.） Stapf. The decomposition rate and water-holding capacity ofN. wightii are at the highest level. It is important for the development, improvement and conservation of the grassland soil.展开更多
基金the National Key Technologies Research and Development Program in the Eleventh Five-Year Plan of China (2006BAC01A11)the Natural Science Foundation of Yunnan Province (2006D0092M, 2007C235M)
文摘This paper divides the process of rainfall redistribution into four levels in vegetation restored region of gully in arid-hot valley of Jinshajiang River. These levels include arbor interception, litter interception, soil interception and surface runoff. The results showed that the maximum of interception was 8.10 mm, the mean interception was 4.53 mm, the maximum of interception rate was 56.10 % and the mean interception rate was 32.63 %.When the rainfall is over 20 mm, the interception rate descends rapidly along with the rainfall increasing. The maximum of water-holding content of litter was 8.14-20.33 t/hm^2, the mean of which is 12.52 t/hm^2 and the maximum of water-holding content was over two times of it own weight. The rainfall of litter interception was 150.24 mm, accounted for the rainfall income 24.48%.The maximum water-holding capacity of soil achieves 2 198.54 t/hm^2, but that of the barren land is 1 825.60 t/hm^2. The rainfall of soil interception was 219.87 mm, accounted for the rainfall income 35.82%. The surface runoff of vegetation restored region was 43.41 mm, accounted for 7.07% of the rainfall income, but the surface runoff of non-forest land was 413,24 mm, accounts for 70.26% of the rainfall income.The surface runoff of the planted forest community was by 63.19% lower than that of the non-forest land. Through the interception of the forest land that reduced the soil erosion effectively, good hydrology effect was obtained.
基金the National Science and Technology Sup-porting Program in the Eleventh Five-Year Plan of China (2006BAC01A11)
文摘In view of the environment character of the soil and content of the soil organic carbon, 278 species of grass and frutex were introduced from abroad and China, Some were selected by applied production and plantation benefit investigations. The results showed that： In the arid-hot valleys of Yuanmou the selected species showed the characteristics of fast growth and high yield （38 227.00 kg/hm2）, high nutrition value （CP% content of legu- minous grass and frutex were 22.47%）, as well as the strong ad- versity resistance to high air temperature and arid climate （soil humidity was 3.4%）. The selected species not only effectively meliorated soil and increased fertility, but also improved small environment weather.
基金Supported by the National Science and Technology Sup-porting Program in the Eleventh Five-Year Plan of China (2006BAC01A11)
文摘The decomposition rate and the water-holding capacity of 6 kinds of grass litters were studied in the Jinshajiang river dry-hot valley. The results showed that the dry weight remains reduced with time but did not have a direct correlation with time. The decomposition litters were affected by climate, character of litter, animalcule and soil animal. The climate factors of temperature and humidity were important especially. The water-holding capacity was in the sequence ofN. wightii （336%）, P. notatum Flugge （248%）, H. contortus （L.） Beauv （209%）, B. pertusa （L.） A. Camus（206%）, L endecaphylla Jacq （174%）, D. annulatum （Forsk.） Stapf （168%）. After 24 months decomposition the remaining dry weight of the litter was in the sequence as follows： 15.12% for N. wightii, 26.38% for I. endecaphylla Jacq, 27.23% for B. pertusa （L.） A. Camus, 30.78% for P. notatum Flugge, 39.72% for H. contortus （L.） Beauv and 39.76% for D. annulatum （Forsk.） Stapf. The decomposition rate and water-holding capacity ofN. wightii are at the highest level. It is important for the development, improvement and conservation of the grassland soil.
