摘要: 目的分析气候变化背景下庐山日本柳杉水分利用效率（WUE）的变化特征以及WUE与主要气候因子之间的关系，为科学评估庐山日本柳杉的碳水耦合关系提供理论支持、�/sec> 方法本研究采用树木年轮稳定碳同位素方法计算日本柳杉WUE，并选择平均气温＇�i>T）、降水量＇�i>W）、平均风速（Ws）、太阳辐射（Rs）、干旱指数（SPEI、SPI、WI）等气候变化相关指标，分析气候变化背景下庐山日本柳杉水分利用效率及其对气候变化的响应、�/sec> 结果�?�?969�?018年，庐山日本柳杉树轮δ ¹³C值序列呈现下降趋势，变化区间为−23.09� ~ �?5.67‰，年平均−24.55‰；庐山日本柳杉WUE的年际值呈现上升趋势，变化区间�?1.06 ~ 118.89 μmol/mol，年平均102.37 μmol/mol；（2）相关性分析表明：庐山日本柳杉 WUE与上一年的7月�?�?1月和当年�?�?月�?�?1月的气温呈显著正相关系，与上�?�?2月以及当年的1�?2月风速均呈极显著负相关关系；而庐山日本柳杉WUE与各月太阳辐射、降水、SPEI、WI以及SPI未产生显著关系；�?）多元回归模型分析表明：庐山日本柳杉WUE主要与Ws ₁（当�?月风速）�?i>T ₃（当�?月均温）�?i>T ₉（当�?月均温）�?i>T _�?（上�?月均温）、Ws ₁₂（当�?2月风速）相关、�/sec> 结论 T和Ws是影响庐山日本柳杉WUE变化的主要气候因子、�i>W、Rs以及干旱指数（SPI、SPEI以及WI）对庐山日本柳杉WUE的变化未产生显著影响、�/sec>

关键诌�
• 庐山/
• 日本柳杉/
• 稳定碳同位素/
• 水分利用效率/
• 气候变匕�/a>

Abstract: ObjectiveThis study aimed to theoretically support the scientific assessment of the carbohydrate-water coupling connection of Cryptomeria japonica. MethodThe water use efficiency (WUE) of Cryptomeria japonicawas calculated using the tree-ring stable carbon isotope method in this study. Additionally, average temperatures ( T), precipitation ( W), average wind speeds (Ws), solar radiation (Rs), the drought index (SPEI, SPI, WI), and other climate change-related indicators were used to analyze the WUE of Cryptomeria japonicaand its adaptation to climate change. Result(1) From 1969 to 2018, the sequence of ¹³C values of Cryptomeria japonicatree rings in Lushan Mountain, Jiangxi Province of eastern China showed a downward trend; the variation range was �?3.09� to �?5.67�? and the annual average was �?4.55�? the inter-annual value of Cryptomeria japonicaWUE showed an upward trend; the variation range was 91.06 to 118.89 μmol/mol, with an annual average of 102.37 μmol/mol. (2) Correlation analysis revealed that the WUE of Cryptomeria japonicain Lushan Mountain was significantly correlated with the temperature in July, September to November of the previous year, February to June, and September to November of the current year, and significantly negatively correlated with the wind speed in July to December of the previous year and January to December of the current year. However, the solar radiation, precipitation, SPEI, WI, and SPI of each month had no significant impact on the WUE of Cryptomeria japonicaon Lushan Mountain. (3)The multiple regression model analysis showed that the WUE of Cryptomeria japonicaon Lushan Mountain was mainly related to Ws ₁(wind speed in January of the current year), T ₃(average temperature in March of the current year), T ₉(average temperature in September of the current year), T _�?(average temperature in September of the previous year), and Ws ₁₂(wind speed in December of the current year). Conclusion Tand Ws are the primary climatic variables affecting WUE of Cryptomeria japonica. The WUE of Cryptomeria japonicaon Lushan Mountain is not significantly affected by W, Rs, or the drought indicators (SPI, SPEI and WI).

Key words:
• Lushan Mountain/
• Cryptomeria japonica/
• stable carbon isotope/
• water use efficiency/
• climate change

�?nbsp; 1研究区域

Figure 1.Study area

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�?nbsp; 2庐山地区1968�?018 年月均SPI、SPEI、WI�?i>T、Rs、Ws咋�i>W的变化及趋势

Figure 2.Average changes and trends of SPI, SPEI, WI,T, Rs, Ws andWin Lushan Mountain area from 1968 to 2018

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�?nbsp; 3庐山日本柳杉年轮稳定碳同位素值和大气CO₂碳同位素值变化及趋势

Figure 3.Changes and trends of stable carbon isotope values (δ¹³C) and atmospheric CO₂carbon isotope values (δ¹³C_p) ofCryptomeria japonica

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�?nbsp; 4庐山日本柳杉水分利用效率的变化特征及趋势

WUE. 水分利用效率� UB.逆序时间序列变化；UF.顺序时间序列变化：�i>R.极差：�i>S.标准差；τ.偶数序列；ln.对数函数。WUE, water use efficiency; UB, inverse-order time series variation; UF, sequential time series variation;R, range;S,standard error;τ, even sequences; ln, logarithmic function.

Figure 4.Variation characteristics and trends of water use efficiency ofCryptomeria japonica

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�?nbsp; 5庐山日本柳杉WUE与月气候变化的相关�?/p>

P 为上年月份，C 为当年月份�?*表示在置信度（双侧）�?.01时相关性显著；*表示在置信度（双侧）�?.05时相关性显著。P represents the month in previous year, C represents the month in current year. ** indicates a significant correlation at a confidence level (bilateral) of 0.01, * indicates that the correlation is significant at a confidence level (bilateral) of 0.05.

Figure 5.Correlations between WUE ofCryptomeria japonicaand monthly climate change in Lushan Mountain

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