The Lancang-Mekong Cooperation(LMC)mechanism was inspired by water and prioritizes water conservation.The two LMC summits both proposed enhancing cooperation in sustainable management and utilization of water resource...The Lancang-Mekong Cooperation(LMC)mechanism was inspired by water and prioritizes water conservation.The two LMC summits both proposed enhancing cooperation in sustainable management and utilization of water resources in the Lancang-Mekong region.To help the general public around the world gain a better understanding of Lancang-Mekong water resources cooperation and pool strength to support such cooperation,China Report ASEAN interviewed Yu Xingjun,senior counsel at the Department of International Cooperation,Science and Technology of China’s Ministry of Water Resources and Chinese leader of the Joint Working Group for Lancang-Mekong Water Resources Cooperation about the developments and achievements of Lancang-Mekong water resources cooperation.展开更多
Since the 1950s of the last century, the exotic plant, Eupatorium adenophorum, has spread rapidly across southwest China, damaging native ecosystems and causing great economic losses. We examined the pH, N, P, K, and ...Since the 1950s of the last century, the exotic plant, Eupatorium adenophorum, has spread rapidly across southwest China, damaging native ecosystems and causing great economic losses. We examined the pH, N, P, K, and organic matter concentrations, and the bacterial community character (by Biolog EcoPlateTM) in soils from sites heavily and lightly invaded by this exotic species. Also, soil from the lightly invaded site was treated with a water extract of E. adenophorum roots to examine the effect of the plant on soil properties. We grew three plant species, one native and two exotic, in pot experiment using soil from heavily invaded site to examine the effects of the soil on these plants growth. The soil analysis demonstrated that the pH, organic matter, total N, total P and total K in soils from the heavily invaded site were only slightly different from those of the lightly invaded site, but concentrations of NH4+, NO?3 and available P and K in the heavily invaded site were greater than those in the lightly invaded site. The catabolic activity of soil bacterial community in the heavily invaded site was different from that in the lightly invaded site. The catabolic activity of bac- terial community in soils treated by the water extract of E. adenophorum roots changed and became similar to that in soils from the heavily invaded site. The pot experiment showed that the exotic plants growth in heavily invaded soil were not different from in lightly invaded soil; however, the native plant biomass decreased dramatically when grown in soil from the heavily invaded site as compared to soil from the lightly invaded site; and the same phenomenon was found when any potential allelopathic effects by E. adeno- phorum were eliminated by added activated carbon to those soils. Difference in soil nutrient availability and allelopathy could not explain this phenomenon of the native plant in the soils from the heavily and lightly invaded sites. Changes ob- served in the soil bacterial community were obviously related to native plant growth in those tow soils. Those results sug- gest that changing soil microbial community may be an im- portant part of E. adenophorum invasion process. Since the soil microbial community serves as bridge in connection of exotic and natural plants, the exotic plant could inhibit the natural plant growth and reproduction by changing the soil microbial community in invaded site.展开更多
文摘The Lancang-Mekong Cooperation(LMC)mechanism was inspired by water and prioritizes water conservation.The two LMC summits both proposed enhancing cooperation in sustainable management and utilization of water resources in the Lancang-Mekong region.To help the general public around the world gain a better understanding of Lancang-Mekong water resources cooperation and pool strength to support such cooperation,China Report ASEAN interviewed Yu Xingjun,senior counsel at the Department of International Cooperation,Science and Technology of China’s Ministry of Water Resources and Chinese leader of the Joint Working Group for Lancang-Mekong Water Resources Cooperation about the developments and achievements of Lancang-Mekong water resources cooperation.
基金the Major Project of Knowledge Innovation of the Chinese Academy of Sciences(KSCX1-SW-13-0X-0X).
文摘Since the 1950s of the last century, the exotic plant, Eupatorium adenophorum, has spread rapidly across southwest China, damaging native ecosystems and causing great economic losses. We examined the pH, N, P, K, and organic matter concentrations, and the bacterial community character (by Biolog EcoPlateTM) in soils from sites heavily and lightly invaded by this exotic species. Also, soil from the lightly invaded site was treated with a water extract of E. adenophorum roots to examine the effect of the plant on soil properties. We grew three plant species, one native and two exotic, in pot experiment using soil from heavily invaded site to examine the effects of the soil on these plants growth. The soil analysis demonstrated that the pH, organic matter, total N, total P and total K in soils from the heavily invaded site were only slightly different from those of the lightly invaded site, but concentrations of NH4+, NO?3 and available P and K in the heavily invaded site were greater than those in the lightly invaded site. The catabolic activity of soil bacterial community in the heavily invaded site was different from that in the lightly invaded site. The catabolic activity of bac- terial community in soils treated by the water extract of E. adenophorum roots changed and became similar to that in soils from the heavily invaded site. The pot experiment showed that the exotic plants growth in heavily invaded soil were not different from in lightly invaded soil; however, the native plant biomass decreased dramatically when grown in soil from the heavily invaded site as compared to soil from the lightly invaded site; and the same phenomenon was found when any potential allelopathic effects by E. adeno- phorum were eliminated by added activated carbon to those soils. Difference in soil nutrient availability and allelopathy could not explain this phenomenon of the native plant in the soils from the heavily and lightly invaded sites. Changes ob- served in the soil bacterial community were obviously related to native plant growth in those tow soils. Those results sug- gest that changing soil microbial community may be an im- portant part of E. adenophorum invasion process. Since the soil microbial community serves as bridge in connection of exotic and natural plants, the exotic plant could inhibit the natural plant growth and reproduction by changing the soil microbial community in invaded site.
