Seasonal dynamics of vegetation over the past 100 years inferred from tree rings and climate in Hulunbei'er steppe,northern China |
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| Institution: | 1. State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110164, PR China;2. Tree-Ring Laboratory, Lamont-Doherty Earth Observatory, Columbia University, NY 10964, USA;3. International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI 96815, USA;4. MOE Key Laboratory of Western China''s Environmental Systems, Lanzhou University, Lanzhou 730000, PR China;5. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, PR China;1. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;2. National Risk Management Research Laboratory, U.S. Environmental Protection Agency, 26 W. Martin Luther King Drive, Cincinnati, OH 45268, USA;3. Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287-5701, USA;1. Department of Geography, Johannes Gutenberg University, Mainz, Germany;2. Department of Geography, University of Cambridge, United Kingdom;3. Swiss Federal Research Institute for Forest, Snow, and Landscape (WSL), Birmensdorf, Switzerland;4. Global Change Research Institute of the Czech Academy of Sciences (CzechGlobe), 603 00 Brno, Czech Republic;5. Department of Geography, Faculty of Science, Masaryk University, 613 00 Brno, Czech Republic;6. Moravian Dendro-Labor, Brno, Czech Republic;1. University of Natural Resources and Life Sciences Vienna, BOKU, Konrad Lorenz Straße 24, 3430 Tulln an der Donau, Austria;2. Climatic Research Unit, University of East Anglia, Norwich NR4 7TJ, United Kingdom;1. Birbal Sahni Institute of Palaeobotany, 53 University Road, Lucknow, 226007, India;2. Wadia Institute of Himalayan Geology, 33 General Mahadeo Singh Road, Dehradun, 248001, India;3. Waikhom Mani Girls'' College, Thoubal, 795138, Manipur, India;1. Institute of Desert Meteorology, China Meteorological Administration, Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration, Key Laboratory of Tree-ring Ecology of Xinjiang Uigur Autonomous Region, Urumqi 830002, China;2. Almaty Branch of Kazakh Scientific Research Institute of Forestry, Ministries of Agriculture, Almaty, Kazakhstan |
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| Abstract: | The relationship between monthly vegetation cover anomalies and climate in the Hulunbei'er steppe were studied through analyzing the relationship between regional normalized difference vegetation index (NDVI) and climatic variables, and NDVI and tree-ring width during the growing season (May–October). The local moisture (dry/wet) and temperature (cold/warm) variations largely affected the vegetation cover and the radial growth of Mongolian pines (Pinus sylvestiris Linnaeus var. mongolica Litvinov) in the steppe. Monthly precipitation and Palmer drought severity index (PDSI) data from the previous to the current growing seasons were positively correlated to regional vegetation cover and radial growth of Mongolian pines; however, negative correlations were found between temperature and vegetation variables. A reconstruction of monthly vegetation cover dynamics for the growing season was created and spans 116 years (from 1891 to 2006). The results show that the total numbers of anomalies for dense and sparse seasonal vegetation cover is 22 years over the 116 year record; about 5–7 relatively dense or sparse periods; and ～2–8 years significant periodicities (p < 0.05). Linkages to the Pacific Ocean and Arctic Ocean regimes were also detected. |
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