Effective rainfall seasons for interannual variation in δ13C and tree-ring width in early and late wood of Chinese pine and black locust on the Loess Plateau, China
Effective rainfall seasons for interannual variation in δ13C and tree-ring width in early and late wood of Chinese pine and black locust on the Loess Plateau, China
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DOI：
10.1007/s10310-009-0111-2
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发表时间：
2009-02
影响因子：
1.5
通讯作者：
Satomi Koretsune;K. Fukuda;Z. Chang;F. Shi;A. Ishida
中科院分区：
文献类型：
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作者：
Satomi Koretsune;K. Fukuda;Z. Chang;F. Shi;A. Ishida
通过研究季节性降水与年稳定碳同位素比值（δ13C）和早晚材年轮宽度的相关性，研究了有效降雨对水利用效率（WUE）和油松（Pinus tabulaeformisCarr.）和刺槐（RobiniapseudoacaciaL.）年轮生长的重要性。从去年 1 月到当年 10 月，每个月以及 2 至 22 个月的所有可能长度的时期都与降水量相关。采用相关性最高的时期作为WUE和树木年轮宽度年际变化最有效的降雨季节。在早期木材中，生长季前的旱季（10 月至 5 月）降水与松树的 δ13C 呈负相关，与松树和槐树的年轮宽度呈正相关。晚材方面，当年生长季降雨量与松树和槐树的δ13C呈负相关，与槐树的年轮宽度呈正相关。我们的结果证明了松树和槐树的水分利用策略的差异。松树的 δ13C 表明，与槐树相比，松树的 WUE 更高，用水更保守。旱季降水影响了松树和槐树WUE和树轮生长的年际变化，表明旱季降雨对于下一生长季的碳增益和树轮生长具有重要意义。
We studied the importance of effective rainfall for interannual variation in water use efficiency (WUE) and tree-ring growth of Chinese pine (Pinus tabulaeformisCarr.) and black locust (Robinia pseudoacaciaL.) by examining correlations of seasonal precipitation with annual values of stable carbon isotope ratio (δ13C) and tree-ring width in early and late wood. The correlations with precipitation were examined for each month and for periods of all possible lengths from 2 to 22 months starting from January of the previous year to October of the current year. The period with the highest correlation was adopted as the most effective rainfall season for interannual variations in WUE and tree-ring width. In early wood, precipitation during the dry season (October to May) before the growing season was negatively correlated with δ13C in pine trees and positively correlated with ring width in pine and locust trees. In late wood, rainfall during the growing season in the current year was negatively correlated with δ13C in pine and locust trees, and positively correlated with ring width in locust trees. Our results demonstrated the differences in the water use strategies of pine and locust trees. The δ13C in pines indicated higher WUE and more conservative water use than in locust trees. Precipitation during the dry season affected the interannual variation in WUE and tree-ring growth in pine and locust trees, indicating that rainfall during the dry season is important for carbon gain and tree-ring growth during the following growing season.