杉木不同地理种源树轮对气候变化的响应

造林树种种源选择已成为人类应对气候变化的重要途径。探讨主要造林树种不同地理种源对气候变化的响应及评价未来气候变化对树木种源生长的影响已成为亟需探讨的重要科学问题。种源试验林及树轮气候学方法的成熟为这一问题的探讨提供了可靠依据。项目拟以成熟龄杉木种源试验林为对象，采用年轮气候学研究方法，构建杉木不同地理种源树轮宽度、木材密度及稳定碳同位素序列，通过相关分析和回归分析，探讨杉木地理种源树轮径向生长、木材密度及稳定碳同位素与气候因子温度及降水量等指标的关系，从不同树轮指标层次，揭示杉木不同地理种源生长对气候变化的响应差异，揭示气候变化对杉木生长的影响。以不同种源树轮资料研究气候变化对树木生长的影响在国内尚无报道，而结合探讨不同种源树轮多层次指标对气候变化的响应在国内外亦属首创。项目成果将可为我国未来气候变化条件下种源层面上森林资源的培育起到重要指导作用，并为林业应对气候变化制定对策提供依据。

Provenance selection for afforestation has already become an important approach for the reply of mankind to climate change. The discussion of the response of different provenance of main tree species to climate change and the evaluation of the impact of climate change on different provenance has become principal scientifical question to be solved. The maturity of tree provenance trails and dendroclimatology method have provided a credible approach to solve this problem. The project will view mature chinese fir provenance trial stands as objective, adopting dendroclimatology method to build the tree ring width, timber density and stable-carbon isotope series, and through correlation analysis and regression analysis, discuss the relationship between tree ring radial growth, timber density and stable-carbon isotope and climate factors such as temperature, precipitation and comprehensive factors. The aims of this study are to find the response difference of different chinese fir provenances to climate change and the impacts of climate change on chinese fir growth in view of different tree ring indices. The studies of impact of climate change on tree growth based on tree ring data of different provenances still have no reports in China, and the research on responses of different tree provenances to climate change in view of different tree ring indices have obvious creation in this project. The research results can provide important direction for provenance-level forest resource cultivation under future climate change, and provide theoretical and practical evidences for drawing up forest countermeasure to replying climate change.