Qomolangmo is the 3rd Goddess in the eyes of the Tibetans, and since 1966 I have had the chance to stay there on eight occasions for a total of eight years. During this period, I was nurtured by her 'milk', br...Qomolangmo is the 3rd Goddess in the eyes of the Tibetans, and since 1966 I have had the chance to stay there on eight occasions for a total of eight years. During this period, I was nurtured by her 'milk', breathed the fresh air, and enjoyed the hada (referring to 'flag clouds' there) that the mountain hoisted.Qomolangmo is the least contaminated place on earth. In the spring of 1975, geologist Liu Dongsheng proposed undertaking a research project entitled 'Evolution of the Environment in展开更多
The foliar C and N stable isotopic compositions(δ 13C and δ 15N) and the relationships between these compositions and environmental factors of C3 plants in the Ethiopia Rift Valley were investigated. There were thre...The foliar C and N stable isotopic compositions(δ 13C and δ 15N) and the relationships between these compositions and environmental factors of C3 plants in the Ethiopia Rift Valley were investigated. There were three distribution patterns for foliar δ 13C with mean values of ?26.7‰±0.4‰,?29.7‰± 0.6‰,and ?26.9‰± 1.2‰ in cold-moist,temperate-moist,and arid-hot environments,respectively. The δ 15N values ranged from ?1.4‰± 1.7‰ to 14.3‰± 0.1‰,with higher values under arid-hot conditions and the lowest values in plants growing at higher altitudes under cold-moist conditions. A strong negative relationship between mean annual precipitation and δ 15N explained more than half of the observed variation in the δ 15N values(r2 = 0.54,P < 0.001);a modest positive relationship was also found between δ 15N and tem-perature(r2 = 0.32,P < 0.01). A weakly positive relationship existed between δ 13C and temperature,and changes in δ 13C values with precipitation and altitude followed quadratic curves. This suggests a shift in the effects of water and heat conditions caused by altitude on carbon isotopic discrimination.展开更多
文摘Qomolangmo is the 3rd Goddess in the eyes of the Tibetans, and since 1966 I have had the chance to stay there on eight occasions for a total of eight years. During this period, I was nurtured by her 'milk', breathed the fresh air, and enjoyed the hada (referring to 'flag clouds' there) that the mountain hoisted.Qomolangmo is the least contaminated place on earth. In the spring of 1975, geologist Liu Dongsheng proposed undertaking a research project entitled 'Evolution of the Environment in
基金Supported by the Import-Talents Program of the Cold and Arid Regions Environ-mental and Engineering Research Institute (Grant No. 2005104)the National Natural Science Foundation of China (Grant No. 40501076)the Chinese Science Expedition (DEEP) of the China Association for Scientific Expedition, and Inter-national Partnership Project of Chinese Academy Sciences (Grant No. CXTD-Z2005-2)
文摘The foliar C and N stable isotopic compositions(δ 13C and δ 15N) and the relationships between these compositions and environmental factors of C3 plants in the Ethiopia Rift Valley were investigated. There were three distribution patterns for foliar δ 13C with mean values of ?26.7‰±0.4‰,?29.7‰± 0.6‰,and ?26.9‰± 1.2‰ in cold-moist,temperate-moist,and arid-hot environments,respectively. The δ 15N values ranged from ?1.4‰± 1.7‰ to 14.3‰± 0.1‰,with higher values under arid-hot conditions and the lowest values in plants growing at higher altitudes under cold-moist conditions. A strong negative relationship between mean annual precipitation and δ 15N explained more than half of the observed variation in the δ 15N values(r2 = 0.54,P < 0.001);a modest positive relationship was also found between δ 15N and tem-perature(r2 = 0.32,P < 0.01). A weakly positive relationship existed between δ 13C and temperature,and changes in δ 13C values with precipitation and altitude followed quadratic curves. This suggests a shift in the effects of water and heat conditions caused by altitude on carbon isotopic discrimination.
