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Effects of meteorological factors on the defoliation dynamics of the larch caterpillar(Dendrolimus superans Butler)in the Great Xing’an boreal forests

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Journal of Forestry Research 2021年第6期32卷 2683-2697页

作者： Lei Fang Yue Yu Guofei Fang Xu Zhang Zhijun Yu Xudong Zhang Ellen Crocker Jian Yang CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016LiaoningPeople’s Republic of China Key Laboratory of State Forestry and Grassland Administration On Forest Pest Monitoring and Warning General Station of Forest and Grassland Pest ManagementNational Forestry and Grassland AdministrationShenyang 110034LiaoningPeople’s Republic of China Department of Forestry and Natural Resources University of KentuckyLexingtonKY 40546USA

Larch caterpillars are widely distributed in the Great Xing’an boreal forests;however,the relationship between caterpillar defoliation dynamics and climatic factors is poorly *** aims of this study are to investigate the primary weather conditions that might influence forest defoliation and to identify the most important life stage of the larch caterpillar at which forest defoliation might be mitigated by incorporating more inhibitory influences from climatic *** life cycle of the larch caterpillar was partitioned into four stages and multiple linear regression and mixed effect models were combined with a relative weight analysis approach to evaluate the importance and influence of meteorological variables on defoliation *** results show that warmer temperatures in growing seasons and overwintering periods can increase the defoliation area,while rainy and humid growing seasons decrease the defoliation *** precipitation during the early instar larval period had the greatest power to explain the variance in defoliation dynamics and had a very strong inhibitory effect,followed by the accumulative temperatures of the late instar larval period which had a positive impact,and precipitation during the middle instar larval period which had a negative *** conditions during the early instar larval period had the greatest influence on the area defoliated and accounted for 40%of the explained *** study demonstrates that climatic warming and drying will increase the risk of larch caterpillar outbreaks in the Great Xing’an Mountains.

关键词： Larch caterpillar defoliation area Climatic warming Life cycle Great xing’an mountains Relative importance

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