According to a lot of hydrological and environmental monitoring data, the condition of soil and water loss in the Lancang River Mekong River watershed (in Yunnan section, China) is described. The occurrence and devel...According to a lot of hydrological and environmental monitoring data, the condition of soil and water loss in the Lancang River Mekong River watershed (in Yunnan section, China) is described. The occurrence and development of soil and water loss is analyzed. The conclusion is that: (1) generally, the situation of soil and water loss in the Lancang River Mekong River watershed (in Yunnan section, China) is light, however, soil and water loss in some regions is serious, especially in the middle reach area of the river; (2) soil and water loss in the Lancang River Mekong River (in Yunnan section, China) watershed presents developing tendency and it is mainly caused by human beings. In accordance with these results, the control measures for soil and water loss are discussed.展开更多
The ecological environment in the area where the Qinghai-Tibet Railway passes through is very fragile and is showing the tendency of retrogression. So as the construction would largely disturb the earth surface and ve...The ecological environment in the area where the Qinghai-Tibet Railway passes through is very fragile and is showing the tendency of retrogression. So as the construction would largely disturb the earth surface and vegetation and would have a large quantity of earth and stone digging, the construction of the railway in this area would certainly lead to a series of questions. Through the integrated analysis of the actualities of soil erosion and water and soil conservation along the section of Tanggula-Lhasa of the Qinghai-Tibet Railway, and with the combination of the features of the railway construction and the environment, the protection measures and proposals about the soil erosion along the section of Tanggula to Lhasa of the Qinghai-Tibet Railway have been put forward, so as to reach to the purpose of holding back the further development of soil erosion along the line, improving the ecological environment in the local area and maintaining the railway in normal operation.展开更多
A greenhouse experiment was conducted involving complete/intact 100 cm cores of a fragipan soil. The cores were maintained in moist conditions throughout the experiment as annual ryegrass (Lolium multiflorum) or festu...A greenhouse experiment was conducted involving complete/intact 100 cm cores of a fragipan soil. The cores were maintained in moist conditions throughout the experiment as annual ryegrass (Lolium multiflorum) or festulolium (Lolium spp and Fescue spp hybrid) were grown with and without additional surface applied amendments, including NaF, NaNO3, NaCl, and KCl. The results suggest a significant effect of annual ryegrass and festulolium on fragipan horizon degradation after 24 months. Annual ryegrass and festulolium were found to effectively change the structure of the fragipan horizon when planted on the soil surface and roots grew through the upper soil profile and penetrated into the fragipan. The fragipan structural change (degradation) appeared to increase with each planting sequence, particularly with soybean crop rotations. Sodium nitrate added to the soil surface with the growth of annual ryegrass resulted in a significant synergistic effect for degrading the fragipan horizon. The other amendments were not as effective in causing additional fragipan degradation.展开更多
文摘According to a lot of hydrological and environmental monitoring data, the condition of soil and water loss in the Lancang River Mekong River watershed (in Yunnan section, China) is described. The occurrence and development of soil and water loss is analyzed. The conclusion is that: (1) generally, the situation of soil and water loss in the Lancang River Mekong River watershed (in Yunnan section, China) is light, however, soil and water loss in some regions is serious, especially in the middle reach area of the river; (2) soil and water loss in the Lancang River Mekong River (in Yunnan section, China) watershed presents developing tendency and it is mainly caused by human beings. In accordance with these results, the control measures for soil and water loss are discussed.
文摘The ecological environment in the area where the Qinghai-Tibet Railway passes through is very fragile and is showing the tendency of retrogression. So as the construction would largely disturb the earth surface and vegetation and would have a large quantity of earth and stone digging, the construction of the railway in this area would certainly lead to a series of questions. Through the integrated analysis of the actualities of soil erosion and water and soil conservation along the section of Tanggula-Lhasa of the Qinghai-Tibet Railway, and with the combination of the features of the railway construction and the environment, the protection measures and proposals about the soil erosion along the section of Tanggula to Lhasa of the Qinghai-Tibet Railway have been put forward, so as to reach to the purpose of holding back the further development of soil erosion along the line, improving the ecological environment in the local area and maintaining the railway in normal operation.
文摘A greenhouse experiment was conducted involving complete/intact 100 cm cores of a fragipan soil. The cores were maintained in moist conditions throughout the experiment as annual ryegrass (Lolium multiflorum) or festulolium (Lolium spp and Fescue spp hybrid) were grown with and without additional surface applied amendments, including NaF, NaNO3, NaCl, and KCl. The results suggest a significant effect of annual ryegrass and festulolium on fragipan horizon degradation after 24 months. Annual ryegrass and festulolium were found to effectively change the structure of the fragipan horizon when planted on the soil surface and roots grew through the upper soil profile and penetrated into the fragipan. The fragipan structural change (degradation) appeared to increase with each planting sequence, particularly with soybean crop rotations. Sodium nitrate added to the soil surface with the growth of annual ryegrass resulted in a significant synergistic effect for degrading the fragipan horizon. The other amendments were not as effective in causing additional fragipan degradation.
