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Effect of rainfall interannual variability on the biomass and soil water distribution in a semiarid shrub community

Science china(Life Sciences) 2010年第6期53卷 729-737页

作者： liu junshanxu xiazhang yong,tian yuqiang & gao qiong state key laboratory of earth surface processes and resource ecology,college of {3.s Science & {4.,beijing normal university,beijing 100875,china state key laboratory of {3. {4. processes and resource ecology College of Resources Science & Technology Beijing Normal University Beijing China

The dynamics of biomass and soil moisture in semiarid land is driven by both the current rainfall and the ecosystem *** on a meta-analysis of existing experiments,an ecosystem model was used to calculate the effect of the rainfall interannual variability on the pattern of biomass and soil moisture in a shrub *** was found that rainfall interannual variability enabled shrubs to be more competitive than grasses,and to maintain the dominant role over a longer *** rainfall interannual variability resulted in complex soil moisture *** soil water recharge in wet years alternated with discharge in drought years.

关键词： rainfall shrub community Artemisia ordosica ecosystem model ecohydrology

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Integrating global socio-economic influences into a regional land use change model for china

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Frontiers of earth Science 2014年第1期8卷 81-92页

作者： Xia XU qiong gao Changhui PENG Xuefeng CUI Yinghui liu Li JIANG state key laboratory of {3. {4. processes and resource ecology Beijing Normal University Beijing 100875 China Department of Biology Sciences institute of environment Science University of Quebec at Montreal Montreal H3C 3P8 Canada college of Global Change and earth System Research Beijing Normal University Beijing 100875 China Academy of resource Beijing Normal University Beijing 100875 China Academy of Disaster Reduction and Emergency Management Beijing Normal University Beijing 100875 China

With rapid economic development and urba- nization, land use in china has experienced huge changes in recent years; and this will probably continue in the future. Land use problems in china are urgent and need further study. Rapid land-use change and economic development make china an ideal region for integrated land use change studies, particularly the examination of multiple factors and global-regional interactions in the context of global economic integration. This paper presents an integrated modeling approach to examine the impact of global socio-economic {3. on land use changes at a regional scale. We develop an integrated model system by coupling a simple global socio-economic model （GLOBFOOD） and regional spatial allocation model （CLUE）. The model system is illustrated with an application to land use in china. For a given climate change, population growth, and various socio-economic situations, a global socio-economic model simulates the impact of global market and economy on land use, and quantifies changes of different land use types. The land use spatial distribution model decides the type of land use most appropriate in each spatial grid by employing a weighted suitability index, derived from expert knowledge abot^t the ecosystem state and site conditions. A series of model simulations will be conducted and analyzed to demonstrate the ability of the integrated model to link global socio- economic factors with regional land use changes in china. The results allow an exploration of the future dynamics of land use and landscapes in china.

关键词： global socio-economic influence land use change model integrating china

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Carbon Sequestration in Two Alpine Soils on the Tibetan Plateau

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Journal of Integrative Plant Biology 2009年第9期51卷 900-905页

作者： Yu-Qiang tian Xing-Liang Xu Ming-Hua Song Cai-Ping Zhou qiong gao Hua Ouyang college of resources Science & technology State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University Beijing 100875 China key laboratory of Ecosystem Network Observation and Modelling Institute of Geographic Sciences and Natural Resources Research the Chinese Academy of Sciences Beijing 100101 China

Soil carbon sequestration was estimated in a conifer forest and an alpine meadow on the Tibetan Plateau using a carbon- 14.radioactive label provided by thermonuclear weapon tests （known as bomb-^14.）. Soil organic matter was physically separated into light and heavy fractions. The concentration spike of bomb-^14. occurred at a soil depth of 4.cm in both the forest soil and the alpine meadow soil. Based on the depth of the bomb-^14. spike, the carbon sequestration rate was determined to be 3..5 g C/m^2 per year for the forest soil and 27.1 g C/m^2 per year for the alpine meadow soil. Considering that more than 60% of soil organic carbon （SOC） is stored in the heavy fraction and the large area of alpine forests and meadows on the Tibetan Plateau, these alpine ecosystems might partially contribute to ＂the missing carbon sink＂.

关键词： alpine soils bomb carbon carbon sequestration soil organic carbon.

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