Observed and predicted responses of plant growth to climate across Canada
Observed and predicted responses of plant growth to climate across Canada
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DOI：
10.1029/2005gl023646
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发表时间：
2005-08-25
影响因子：
5.2
通讯作者：
Fiske, GJ
中科院分区：
文献类型：
--
作者：
Bunn, AG;Goetz, SJ;Fiske, GJ
利用1981 - 2000年的卫星观测和地面气象站的插值数据，我们研究了加拿大北方森林和苔原地区的总光合活性（Pg）与气候之间的关系。一年生和年际Pg的响应与气候紧密耦合，Pg与气候的季节相关性随植物功能类型的不同而不同。模拟针叶林夏季生长最重要的变量是以往春季的最低温度，而冻土带主要响应夏季最高温度。利用一般环流模式预测到2050年，我们预测在未来几十年，冻土带将继续蓬勃生长，而针叶林将不会。冻土带生产力的增加可能与植被组成的变化有关（例如，木本增生）。如果这些生物反应是静止的，并像预测的那样持续下去，那么陆地碳预算将需要修改。
Using satellite observations from 1981 - 2000, and data interpolated from surface weather stations, we examined the association between gross photosynthetic activity ( Pg) and climate across the boreal forest and tundra of Canada. The response of annual and interannual Pg was tightly coupled to climate, and seasonal associations between Pg and climate varied with plant functional types. The most important variable for modeling summer growth of conifer forests was the previous spring minimum temperature, whereas tundra responded primarily to summer maximum temperature. Using general circulation model predictors to 2050, we project that tundra will continue to grow vigorously in the coming decades while conifer forests will not. Increased tundra productivity will likely be associated with changes in vegetation composition ( e. g., woody proliferation). If these biotic responses are stationary and persist as predicted, terrestrial carbon budgets will need to be modified.