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On the sand surface stability in the southern part of Gurbantünggüt Desert

中国科学：地球科学英文版 2005年第6期48卷 778-785页

作者： wang xueqin1,2. wang Tao1, JIANG Jin2.& ZHAO Congju2.1. Laboratory of Blown Sand Physics and Desert Environment, Cold and Arid Regions of Environmental and Engineering Research In-stitute, chinese academy of sciences, Lanzhou 730000, china 2. xinjiang institute of ecology and geography, chinese academy of sciences, urmqi 830011, china correspondence should be addressed to wang xueqin 1. Laboratory of Blown Sand Physics and Desert Environment Cold and Arid Regions of Environmental and Engineering Research In-stitute Chinese Academy of Sciences 730000 Lanzhou China 2. xinjiang institute of ecology and geography Chinese Academy of Sciences 830011 Urümqi China

Longitudinal dunes are the most widespread dune types in the world sand seas but comprehensive study on the sand surface stability is scarce. The southern part of Gurbantnggt Desert is mainly covered by longitudinal dune in which fixed and semi-fixed dunes occupy over 80% of the total area. Systematic analysis on the climatic conditions, the soil moisture and vegetation distributions, and the sand surface activities showed that the fixed and semi-fixed dunes are in a comprehensive low-energy wind environment. Snow cover and frozen soil provide a good protection to the ground surface in winter. The temporal distribution of precipitation and corresponding variation of temperature create a favorable condition for the desert plants growth, especially for the ephemeral plants. The occurrence of effective winds for sand moving in April to June coincides with the stage of relatively wet sand surface and good vegetation cover, which effectively keep the sand surface stable at the interdune and the plinth of the dunes. Activity sand surface appears only at the crest and the upper part of the sand dunes.

关键词： Gurbantünggüt Desert, longitudinal dune, sand surface stability.

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Ecological response to the climate change on the northern slope of the Tianshan Mountains in xinjiang

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Science china Earth sciences 2005年第6期48卷 765-777页

作者： CHEN Xi1, LUO Geping1, XIA Jun2, ZHOU Kefa1, LOU Shaoping3 & YE Minquan4 1. xinjiang institute of ecology and geography, chinese academy of sciences, urumqi 830011, china 2. institute of Geographical and Resources sciences, chinese academy of sciences, Beijing 100101, china 3. urumqi Meteorological-satellite Land Station, urumqi 830011, china 4. Seismological Bureau of xinjiang Uygur Autonomous Region, urümqi 830011, china correspondence should be addressed to Chen Xi 1. xinjiang institute of {2. and geography Chinese Academy of Sciences 830011 Urumqi China 2. institute of Geographical and Resources sciences Chinese Academy of Sciences 100101 Beijing China 3. urumqi Meteorological-satellite Land Station 830011 Urumqi China 4. Seismological Bureau of xinjiang Uygur Autonomous Region 830011 Urümqi China

The Tianshan Mountains is a high and huge mountain body lying across the central part of xinjiang, china, and is also the main area where the runoff forms in xinjiang. In this paper, a set of RS-based study methods is put forward for deriving the information about the natural change of the ecology in arid areas, and the relationship between the climate change trend and the corresponding ecological response on the northern slope of the Tianshan Mountains since recent 40 years is analyzed from the scales of the land cover ecosystems and landscapes based on the observed data of climate, hydrology, modern glaciers and lakes on the northern slopes of the Tianshan Mountains since recent 40 years and the satellite RS data since recent 10 years by using the RS and GIS technologies. The results are as follows: (1) The overall trend of climate change on the northern slope of the Tianshan Mountains since recent 40 years is that both air temperature and precipitation are increased, especially the increase amplitudes of air tempera-ture, precipitation and annual runoff volume are high since the decade of the 1990s; (2. the in-tegrated indexes of the vegetation in all the geographical divisions on the northern slope of the Tianshan Mountains are obviously increased since recent 10 years, especially in the artificial oases and the foothill belts, such a change trend is advantageous for improving the vegetation ecology; and (3) the vegetation ecology in the arid areas is extremely sensitive to the climate change, the vegetation coverage and the biomass on the northern slope of the Tianshan Moun-tains are continuously increased because of the climate change since recent 10 years, their in-crease amplitudes in the plains and during the late stage are obviously higher than that in the mountainous regions and during the early stage.

关键词： north slope of the Tianshan Mountains, climate change, hydrological change, natural change of ecology,RS and GIS, vegetation index.

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华北区域环境梯度上阔叶林构建模式及分布成因

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植物生态学报 2019年第9期43卷 732-741页

作者：许金石柴永福刘晓岳明郭垚鑫康慕谊刘全儒郑成洋吉成均闫明张峰高贤明王仁卿石福臣张钦弟王茂西北大学西部资源生物与现代生物技术教育部重点实验室西安710069 北京师范大学地表过程与资源生态国家重点实验室北京100875 北京师范大学地理科学学部自然资源学院北京100875 北京师范大学生命科学学院北京100875 北京大学城市与环境学院北京大学生态研究中心地表过程分析与模拟教育部重点实验室北京100871 山西师范大学生命科学学院山西临汾041000 山西大学黄土高原研究所太原030006 中国科学院植物研究所植被与环境变化国家重点实验室北京100093 山东大学生命科学学院济南250100 南开大学生命科学学院天津300071 新疆农业大学草业与环境科学学院乌鲁木齐830091

森林群落的构建即多样性维持机制是当今生态学研究的热点问题。然而,当前群落构建和群落多样性的研究多在间接梯度上进行,而在水、热等影响物种在区域内定植的关键且直接的环境梯度上研究群落构建和多样性模式则鲜有报道。结合环境因子... 详细信息

森林群落的构建即多样性维持机制是当今生态学研究的热点问题。然而,当前群落构建和群落多样性的研究多在间接梯度上进行,而在水、热等影响物种在区域内定植的关键且直接的环境梯度上研究群落构建和多样性模式则鲜有报道。结合环境因子,基于物种组成和谱系方法探讨不同群落的分布成因,有助于解释群落构建过程中的关键问题。该研究基于华北森林群落调查数据和环境数据,涉及7个省市区的2.个以壳斗科、桦木科为优势种的群落,探讨了直接环境梯度上的群落构建和多样性模式,同时用典范对应分析研究了不同群落分布的环境解释。结果发现,相似的群落具有相似的生境偏好,相似的生境条件会形成物种组成相同或相似的群落。环境热量主导了本区域的谱系关系,在年平均气温较低的地区,群落构建主要表现为生境过滤的模式。此外,随着年降水量的增加,生境过滤作用逐渐增加。在温度梯度上,谱系多样性表现为钟形模式,而降水量的增加能导致谱系多样性的增加。

关键词：群落构建谱系多样性水热条件物种组成

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