贺兰山油松生长对三种不同水分指数的响应及1—7月Walter指数重建

蔡秋芳

doi:10.3724/SP.J.1140.2009.06131

贺兰山油松生长对三种不同水分指数的响应及1—7月Walter指数重建

蔡秋芳

中国科学院地球环境研究所黄土与第四纪地质国家重点实验室, 西安 710075

基金项目:

国家自然科学基金项目(40701196,40525004,40599423,40890051)

中科院"院长奖"获得者科研启动专项资金

"西部之光"博士科研启动项目

详细信息

作者简介:
蔡秋芳(1975-),女,助理研究员,博士,从事树轮气候学及全球变化研究,E-mail:caiqf@ieecas.cn

中图分类号: P532
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出版历程
- 收稿日期: 2009-02-25
- 修回日期: 2009-06-15

RESPONSE OF PINUS TABULAEFORMIS TREE-RING GROWTH TO THREE MOISTURE INDICES AND JANUARY TO JULY WALTER INDEX RECONSTRUCTION IN HELAN MOUNTAI

CAI Qiufang

The State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China

摘要

摘要: 相关分析表明,贺兰山树轮差值年表(RES)与三种不同的反映土壤水分状况的指数在生长季不同时段均显著相关,其中RES与1-7月Walter指数相关系数最高达到0.76(n=30,p<0.001)。尽管树木生长对三种不同水分指标的响应程度有所差异,但对共同时段的显著响应结果表明,生长季水分亏缺是油松生长的主要控制因子。同时,在贺兰山研究区考虑了气温和降水因素的Walter指数,可能能够更好地反映树木所能有效利用的水分状况,因此,最终重建了过去200多年1-7月平均Walter指数变化,重建序列的方差解释量为58%(F=38.73,p<0.001)。
- 油松 /
- PDSI /
- Walter指数 /
- 干燥指数DI /
- 重建 /
- 贺兰山
Abstract: There is an evident correlation between tree-ring RES chronology and three different moisture indices (PDSI, Walter index, drought index).The results showed Pinus tabulaeformis tree-ring growth in Helan Mountain responded to each moisture index of growth-season period pretty well,especially is that correlation coefficient between RES and the mean Walter index (WI) from January to July is r=0.76 (n=30,p<0.001),indicating water deficiency in growth season is the predominant limiting factor for Pinus tabulaeformis growth in Helan Mountain,thus it's less reasonable to consider precipitation or temperature independently as the limiting factor for tree growth.Walter index with temperature and precipitation taken into account can better reflect water content for the tree growth than the other two indices in Helan Mountain.Based on regression model,we reconstructed the mean WI from January to July in Helan Mountain for the last 200 years,and the reconstruction captures 58% (F=38.73,p<0.001) of the actual PDSI variance during their common period from 1960 to 1990.
- Pinus tabulaeformis /
- PDSI /
- Walter index /
- drought index /
- reconstruction /
- Helan Mountain

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