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• 研究报告 • 上一篇    下一篇

中国兴安落叶松天然林地理分布及其气候适宜性

杨志香1,3,周广胜1,2**,殷晓洁1,3,贾丙瑞1   

  1. (1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;2中国气象科学研究院, 北京 100081; 3中国科学院大学, 北京 100049)
  • 出版日期:2014-06-10 发布日期:2014-06-10

Geographic distribution of Larix gmelinii natural forest in China and its climatic suitability.

YANG Zhi-xiang1,3, ZHOU Guang-sheng1,2**, YIN Xiao-jie1,3, JIA Bing-rui1   

  1. (1State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 2Chinese Academy of Meteorological Sciences, Beijing 100081, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2014-06-10 Published:2014-06-10

摘要:

准确评估兴安落叶松林潜在分布及其气候适宜性对科学指导森林经营和管理具有重要的现实意义。基于可能影响兴安落叶松林地理分布的8个气候变量:最冷月平均温度(Tc)、最暖月平均温度(Tw)、气温年较差(DTY)、≥5 ℃积温(GDD5)、年均降水量(P)、秋冬季平均降水量(Pa&w)、湿润指数(MI)和年辐射量(RAD),利用最大熵模型确定了影响中国兴安落叶松林地理分布的主导气候因子,并构建了兴安落叶松林地理分布与气候的关系模型。结果表明:影响中国兴安落叶松林地理分布的主导气候因子是TcDTYRADGDD5,累积贡献率达87.8%,表明热量(温度与辐射)是兴安落叶松林存在与否的决定因素,而水分限制作用相当有限。中国兴安落叶松林主要分布在中、低气候适宜区域,其气候特征为:-28.8 ℃≤Tc≤-19.5 ℃;39.0 ℃≤DTY≤46.2 ℃;2871.7 MJ·m-2≤RAD≤3519.8 MJ·m-2;1000.0 ℃·d≤GDD5≤2100.0 ℃·d。
 

关键词: 光照强度, 荧光特征, 光合特征, 谢君魔芋, 能量分配

Abstract: It is necessary to accurately assess the geographic distribution of Larix gmelinii natural forest and its climatic suitability for forest management. There were eight potential climatic factors influencing L. gmelinii forest’s geographic distribution, including mean temperature of the coldest month (Tc), mean temperature of the warmest month (Tw), annual range of monthly mean temperature (DTY), accumulated temperature no less than 5 ℃ (GDD5), annual precipitation (P), precipitation in autumn and winter (Pa&w), moisture index (MI) and solar radiation(RAD). We confirmed the dominant climatic factors using the MaxEnt model and Jackknife analysis method. The results showed that Tc, DTY, RAD and GDD5 were the dominant climatic factors for the distribution of L. gmelinii natural forest, and the cumulative contribution rate of these factors reached 87.8%. This indicated that thermal factors (temperature and solar radiation) were the key factors rather than water conditions. The relationship between the distribution of L. gmelinii forest and the dominant climatic factors was developed by the MaxEnt model, whose accuracy reached the “excellent” level with an AUC value of 0.956. Furthermore, the distribution of L. gmelinii natural forest in China mainly located in low and moderate climatic suitability zones. The thresholds of the four dominant climatic factors were given by their relationship with the geographic distribution probability of L. gmelinii, i.e., -28.8 ℃≤Tc ≤-19.5 ℃; 39.0 ℃≤DTY≤46.2 ℃; 2871.7 MJ·m-2≤RAD≤3519.8 MJ·m-2; 1000.0 ℃·d≤GDD5≤ 2100.0 ℃·d.

Key words: Amorphophallus xiei, fluorescence characteristics, light intensity, photosynthetic characteristics., energy partitioning