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

作　　者：Lei Fang Yue Yu Guofei Fang Xu Zhang Zhijun Yu Xudong Zhang Ellen Crocker Jian Yang 

机构地区：[1]CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,Liaoning,People’s Republic of China [2]Key Laboratory of State Forestry and Grassland Administration On Forest Pest Monitoring and Warning,General Station of Forest and Grassland Pest Management,National Forestry and Grassland Administration,Shenyang 110034,Liaoning,People’s Republic of China [3]Department of Forestry and Natural Resources,University of Kentucky,Lexington,KY 40546,USA

出　　处：《Journal of Forestry Research》2021年第6期2683-2697,共15页林业研究（英文版）

基　　金：The work was supported by the National Key R&D Program of China(2017YFA0604403).

摘　　要：Larch caterpillars are widely distributed in the Great Xing’an boreal forests;however,the relationship between caterpillar defoliation dynamics and climatic factors is poorly understood.The 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 factors.The 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 dynamics.The 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 area.Total 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 impact.Weather conditions during the early instar larval period had the greatest influence on the area defoliated and accounted for 40%of the explained variance.This 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 

分 类 号：S763.421[农业科学—森林保护学]