In this study,39 leaf samples of three angiosperms(Betula albo-sinensis,tree species;and Caragana jubata and Berberis diaphana,shrub species) were collected in the middle-east parts at 2300–3640 m asl of the Qilian M...In this study,39 leaf samples of three angiosperms(Betula albo-sinensis,tree species;and Caragana jubata and Berberis diaphana,shrub species) were collected in the middle-east parts at 2300–3640 m asl of the Qilian Mountains to study the variations of leaf characteristics of angiosperms with altitude change in inland high-altitude regions of China.Five leaf indexes,viz.epidermal cell density(ED),stomatal density(SD),stomatal index(SI),leaf vein density(VD) and carbon isotopic ratio(δ13C),were analyzed in laboratory.The results show that there are significant or even very significant linear correlations between the five indexes and altitude,of which SD,SI and VD exhibit a negative correlation with altitude,while ED and δ13C exhibit a positive correlation with altitude.Such a correlation assemblage is quite different from the situation in the low-altitude humid environment.Generally,only an assemblage of positive correlations can be observed between the indexes(viz.SD,SI and δ13C,etc.) and the altitude in the low-altitude humid environment,which were caused mainly by the plants' responses to the change of atmospheric CO2 concentration(Cα).However,an assemblage of the negative and positive correlations found here may be attributed mainly to the plants' responses to the change of physiological drought caused by change of low temperature,and here it is preliminarily called the inland high-altitude pattern of plant leaf variations.展开更多
Comparative studies of the Yecheng section at the northern piedmont of the Kunlun Mountain, and the Surai Khola section at the southern piedmont of the Himalayan Mountain, indicates that the Qinghai-Tibet Plateau is d...Comparative studies of the Yecheng section at the northern piedmont of the Kunlun Mountain, and the Surai Khola section at the southern piedmont of the Himalayan Mountain, indicates that the Qinghai-Tibet Plateau is dominated by continuous uplift over the past 10 Ma. And the effective time scale for dividing the uplift stages would be 1 Ma. The uplift processes of the entire plateau can be divided mainly into three stages, i.e., a slow uplift stage (10.0-6.0 MaBP), a transitional uplift stage (6.0-2.5 MaBP) and a rapid uplift stage (since 2.5 MaBP). The plateau might have risen to 2000 m above sea level by 4.6 MaBP in response to uplift and to more than 3000 m by 2.5 MaBP.展开更多
准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至...准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至新近系下部的倾斜地层组成;扇体地层主要由新近系上部与第四系砾质层组成;扇体地层沉积相主要包括风成亚相(风棱石、沙丘及黄土等)、水成亚相(冲积洪积相、河湖相等)、重力坍塌亚相及疑似冰碛亚相等;扇体主要是在3.596 Ma BP以来形成;地貌与沉积及其环境过程可分为3个阶段7个亚阶段,分别与区域构造-气候阶段相对应。展开更多
基金supported by National Basic Research Program of China(Grant No.2012CB822003)National Natural Science Foundation of China(Grant No.41172022)Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20120211110022)
文摘In this study,39 leaf samples of three angiosperms(Betula albo-sinensis,tree species;and Caragana jubata and Berberis diaphana,shrub species) were collected in the middle-east parts at 2300–3640 m asl of the Qilian Mountains to study the variations of leaf characteristics of angiosperms with altitude change in inland high-altitude regions of China.Five leaf indexes,viz.epidermal cell density(ED),stomatal density(SD),stomatal index(SI),leaf vein density(VD) and carbon isotopic ratio(δ13C),were analyzed in laboratory.The results show that there are significant or even very significant linear correlations between the five indexes and altitude,of which SD,SI and VD exhibit a negative correlation with altitude,while ED and δ13C exhibit a positive correlation with altitude.Such a correlation assemblage is quite different from the situation in the low-altitude humid environment.Generally,only an assemblage of positive correlations can be observed between the indexes(viz.SD,SI and δ13C,etc.) and the altitude in the low-altitude humid environment,which were caused mainly by the plants' responses to the change of atmospheric CO2 concentration(Cα).However,an assemblage of the negative and positive correlations found here may be attributed mainly to the plants' responses to the change of physiological drought caused by change of low temperature,and here it is preliminarily called the inland high-altitude pattern of plant leaf variations.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 49802016) the opening foundation of Shapotou Desert Research & Experiment Station, CAS (Grant No. 200009) the National Key Basic Research Development Plan (Grant
文摘Comparative studies of the Yecheng section at the northern piedmont of the Kunlun Mountain, and the Surai Khola section at the southern piedmont of the Himalayan Mountain, indicates that the Qinghai-Tibet Plateau is dominated by continuous uplift over the past 10 Ma. And the effective time scale for dividing the uplift stages would be 1 Ma. The uplift processes of the entire plateau can be divided mainly into three stages, i.e., a slow uplift stage (10.0-6.0 MaBP), a transitional uplift stage (6.0-2.5 MaBP) and a rapid uplift stage (since 2.5 MaBP). The plateau might have risen to 2000 m above sea level by 4.6 MaBP in response to uplift and to more than 3000 m by 2.5 MaBP.
文摘准噶尔盆地西缘白杨河上游莫合台地区冲积洪积扇戈壁地貌与沉积发育,且富锶水土资源丰富,古环境和水土资源研究意义明显。结合以前研究资料,野外考察和室内分析综合表明:扇群按照形态参数可分为大、中、小3种;扇体基底地层主要由侏罗至新近系下部的倾斜地层组成;扇体地层主要由新近系上部与第四系砾质层组成;扇体地层沉积相主要包括风成亚相(风棱石、沙丘及黄土等)、水成亚相(冲积洪积相、河湖相等)、重力坍塌亚相及疑似冰碛亚相等;扇体主要是在3.596 Ma BP以来形成;地貌与沉积及其环境过程可分为3个阶段7个亚阶段,分别与区域构造-气候阶段相对应。
