文献类型：期刊文献

英文题名：Insect-induced tree mortality of boreal forests in eastern Canada under a changing climate

作者：Zhang, Xiongqing[1,2] Lei, Yuancai[3] Ma, Zhihai[1] Kneeshaw, Dan[1] Peng, Changhui[1]

第一作者：Zhang, Xiongqing;张雄清

通信作者：Peng, CH[1]

机构：[1]Univ Quebec, Dept Biol Sci, Ctr Forest Res, Montreal, PQ H3C 3P8, Canada;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China

年份：2014

卷号：4

期号：12

起止页码：2384-2394

外文期刊名：ECOLOGY AND EVOLUTION

收录：;Scopus(收录号：2-s2.0-84902507633);WOS:【SCI-EXPANDED(收录号:WOS:000337738800007)】；

基金：This study was supported by the National Science and Engineering Research Council of Canada (NSERC) Strategic Network (ForValueNet), a NSERC discovery grant, and Chinese Ministry of Science and Technology (2005DIB5JI42). We would like to thank the Forestry Branch of Manitoba, the Ontario Terrestrial Assessment Program, the Ministere des Ressources Naturelles et de la Faune du Quebec, and our colleagues (J. Parton, and K. Zhou) for their help in providing detailed data. We would also like to thank T. Hogg for his help with CMI calculations and Brian Doonan for their comments and discussions on an earlier draft of this paper.

语种：英文

外文关键词：Carbon dynamics; climate change; eastern Canada's boreal forest; forest insect; spruce budworm; tree mortality

摘要：Forest insects are major disturbances that induce tree mortality in eastern coniferous (or fir-spruce) forests in eastern North America. The spruce budworm (SBW) (Choristoneura fumiferana [Clemens]) is the most devastating insect causing tree mortality. However, the relative importance of insect-caused mortality versus tree mortality caused by other agents and how this relationship will change with climate change is not known. Based on permanent sample plots across eastern Canada, we combined a logistic model with a negative model to estimate tree mortality. The results showed that tree mortality increased mainly due to forest insects. The mean difference in annual tree mortality between plots disturbed by insects and those without insect disturbance was 0.0680 per year (P < 0.0001, T-test), and the carbon sink loss was about 2.87t C ha(-1) year(-1) larger than in natural forests. We also found that annual tree mortality increased significantly with the annual climate moisture index (CMI) and decreased significantly with annual minimum temperature (T-min), annual mean temperature (T-mean) and the number of degree days below 0 degrees C (DD0), which was inconsistent with previous studies (Adams et al. 2009; van Mantgem et al. 2009; Allen et al. 2010). Furthermore, the results for the trends in the magnitude of forest insect outbreaks were consistent with those of climate factors for annual tree mortality. Our results demonstrate that forest insects are the dominant cause of the tree mortality in eastern Canada but that tree mortality induced by insect outbreaks will decrease in eastern Canada under warming climate.