| 开都河中游地区雪岭云杉林上下限树轮宽度对比及其气候响应分析 |
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| 引用本文： | 张同文,袁玉江,魏文寿,何清,张瑞波,喻树龙,陈峰.开都河中游地区雪岭云杉林上下限树轮宽度对比及其气候响应分析[J].干旱区地理,2013,36(4):680-690. |
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| 作者姓名： | 张同文 袁玉江 魏文寿 何清 张瑞波 喻树龙 陈峰 |
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| 作者单位： | 中国气象局乌鲁木齐沙漠气象研究所，中国气象局树木年轮理化研究重点开放实验室，新疆树木年轮生态实验室， 新疆 乌鲁木齐 830002 |
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| 基金项目： | 国家国际科技合作计划资助(2010DFA92720-14)和科技部公益性行业（气象）科研专项（GYHY200806011）共同资助 |
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| 摘 要： | 利用开都河流域中段采集的雪岭云杉树芯样本，采用研究区域森林上下限2个采样点的树轮宽度年表，分析该地区两个树轮宽度年表的基本特征，建立与气象因子的关系模型，探讨树轮宽度生长与北大西洋涛动的关系。结果表明：（1）森林上限树木生长的一致性要强于森林下限，并且上限树轮宽度年表可能含有更多的气候信息；（2）森林上、下限树轮宽度年表在全频域、高频域及低频域上均存在显著正相关；（3）森林上、下限树轮宽度年表的气候响应结果基本一致，均表现出对上年9月至当年3月的逐月平均气温呈显著正相关，且均与上年12月的平均气温相关最高。树轮宽度年表与气象因子关系的模拟结果也证明了上年9、12月份和当年2、3、4月份的月平均气温与研究区树轮宽度生长间的密切关系；（4）研究区域树轮宽度生长与冬季北大西洋涛动指数的变化趋势较为一致。
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| 关 键 词： | 开都河 雪岭云杉 树轮宽度 气候响应 |
| 收稿时间： | 2012-11-23 |
Contrastive analysis and climate response of tree-ring width of Picea schrenkiana at the upper and lower forest limits in the middle section of the Kaiduhe River watershed |
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| ZHANG Tong-wen,YUAN Yu-jiang,WEI Wen-shou,HE Qing,ZHANG Rui-bo,YU Shu-long,CHEN Feng.Contrastive analysis and climate response of tree-ring width of Picea schrenkiana at the upper and lower forest limits in the middle section of the Kaiduhe River watershed[J].Arid Land Geography,2013,36(4):680-690. |
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| Authors: | ZHANG Tong-wen YUAN Yu-jiang WEI Wen-shou HE Qing ZHANG Rui-bo YU Shu-long CHEN Feng |
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| Affiliation: | Institute of Desert Meteorology, China Meteorological Administration, Key Laboratory of Tree-ring Physical and Chemical Research ofChina Meteorological Administration, Key Laboratory of Tree-ring Ecology of Uigur Autonomous Region, Urumqi, 830002, Xinjiang,China |
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| Abstract: | Due to the abundant primordial forest and good grassland resources in the stream section，the Kaiduhe River plays a crucial role in the development of agriculture and grassland farming in South Xinjiang，China. To better understand the climatic regimes of the Kaiduhe River watershed，it is important to obtain the climatic variation information in the past for this region，because it enables the recent observed changes to be viewed from a long-term perspective. The abundant forest resource in the Kaiduhe River watershed provides an excellent opportunity for dendroclimatological studies. Tree-ring datum have been used widely as important archives in paleoclimatic research because of their precise dating，annual resolution，and comparability with instrumental meteorological data. In this study，a total of 89 cores from 46 spruce trees （Picea schrenkiana）] were obtained for 2 individual sites，named as Haerhatigou No.1 （HE1） and Haerhatigou No.2 （HE2），ranging from the the upper and lower forest limits in the middle section of the Kaiduhe River watershed in August 2011. All of tree-ring cores were natural dried，mounted，surfaced and cross-dated following standard dendrochronological procedures. Each ring-width was subsequently measured with a resolution of 0.001 mm by dendrometer. The quality control of cross-dating was carried out using the COFECHA program. The ARSTAN program was used for de-trending and developing tree-ring chronologies. The age- and size-related variation of the tree-ring widths was removed by a single detrending process applied on each tree-ring measurements: a negative exponential curve，a kind of conservative function. After all these processes，three kinds of chronologies from two sample sites were developed: standard chronology，residual chronology，and Arstan chronology. The standard chronologies for two sample sites were used in our study，which contains the common variations among the individual tree core series and retains low through high-frequency common variance，presumably in response to climate.Compared among statistical characteristics of the chronologies，HE1’s standard deviation，mean sensitivity，mean correlation between all series，mean correlation within a tree，mean correlation between trees，and signal-to-noise ratio except expressed population signal were all higher than HE2’s. The result means the chronology at the upper orest limits may contain more climatic signals. Compared with two chronologies in the original，high-and low-frequency domain，the results show that there are significant correlations. The results of tree growth-climate responses show that two chronologies were found to be positively correlated with the monthly mean temperature from the previous September to current March at the 95% confidence level. The simulation results of tree-ring width chronologies with climatic factors showed that the monthly mean temperature from the previous September，the previous December，the current February，the current March and the current April may simulate the chronologies at the the upper and lower forest limits well. The similar long-term trends among two chronologies and three winter NAO indexes reveal that the tree-ring width growing variation in the study area has strong teleconnections with the oscillations of land-atmospheric-ocean circulation systems. |
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| Keywords: | Kaiduhe River Picea schrenkiana tree-ring width climate response |
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