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      氣候變化研究進(jìn)展 ?? 2011, Vol. 7 ?? Issue (5): 317-323.

      ? 氣候變化影響 ? 上一篇    下一篇

      青藏高原植物返青期變化及其對氣候變化的響應(yīng)

      丁明軍1,張鐿鋰2,劉林山3,4,王兆鋒2   

      1. 1. 江西師范大學(xué)地理與環(huán)境學(xué)院、中國科學(xué)院地理科學(xué)與資源研究所
        2. 中國科學(xué)院地理科學(xué)與資源研究所
        3. 中科院地理科學(xué)與資源研究所
        4.
      • 收稿日期:2011-01-11 修回日期:2011-08-19 出版日期:2011-09-30 發(fā)布日期:2011-09-30
      • 通訊作者: 丁明軍 E-mail:dingmingjun@igsnrr.ac.cn
      • 基金資助:
        國家重點基礎(chǔ)研究發(fā)展計劃;國家自然科學(xué)基金項目

      Spatiotemporal Changes of Commencement of Vegetation Regreening and Its Response to Climate Change on Tibetan Plateau

      • Received:2011-01-11 Revised:2011-08-19 Online:2011-09-30 Published:2011-09-30

      摘要: 基于連續(xù)的植被指數(shù)(NDVI)、氣溫和降水?dāng)?shù)據(jù),提取了1982—2009年青藏高原典型臺站鄰近區(qū)域的植物返青期以及0℃和5℃旬均溫始期的時序數(shù)據(jù),分析了其時空變化特征,探討了青藏高原冬、春季的氣溫、降水變化對植物返青期的影響。結(jié)果表明:1) 青藏高原典型臺站鄰近區(qū)域植物返青期多年平均值在東西向和南北向上存在顯著差異;1982—2009年間,青藏高原典型臺站鄰近區(qū)域植物返青期整體呈提前趨勢。2) 青藏高原典型臺站0℃和5℃旬均溫始期整體呈提前趨勢,5℃旬均溫始期提前趨勢更為顯著。3) 青藏高原植物返青期隨著冬、春季氣溫升高和降水增加而提前。與降水相比,返青期與氣溫的相關(guān)程度更高。冬季氣溫比春季氣溫對植物返青期的影響更大。

      關(guān)鍵詞: 青藏高原, 返青期, 氣溫, 降水, Tibetan Plateau, vegetation regreening, air temperature, precipitation

      Abstract: Detecting the growing season variability of terrestrial vegetation is crucial for identifying responses of ecosystems to recent climate change. Based on the normalized difference vegetation index (NDVI) and the air temperature and precipitation data, we have extracted the commencement of growing season (CGS) and the commencement of dekadly average temperature (CDAT) of 0 and 5℃ at typical weather stations on Tibetan Plateau from 1982-2009, and analyzed their spatiotemporal changes and the relationships between the CGS of vegetation and the air temperature and precipitation of winter and spring. The results show: the CDAT of 0 and 5℃ on the whole showed an advanced tendency, and the tendency of 5℃was more significant than that of 0℃; the multiple years average of CGS near typical weather stations gradually delayed from south to north and from east to west, and from 1982 to 2009, the CGS displayed an advanced tendency at all typical weather stations; and the CGS had a negative relation with the air temperature and precipitation of winter and spring, furthermore, the correlation of CGS with temperature was stronger than with precipitation. Different seasonal temperatures had different effects on CGS and the winter temperature affected CGS more than spring temperature.

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