新疆伊犁乌孙山北坡树轮灰度年表的建立及气候意义

利用2006年采自新疆伊犁乌孙山北坡3个采点的树轮样本，建立了树轮宽度年表，采用树轮图像分析法进一步建立了3种宽度年表和5种灰度年表。宽度年表对比发现，树木年轮对气候响应南疆强于北疆，北疆其它地方强于伊犁地区，而乌孙山北坡与伊犁其它地区比较，树轮宽度对气候的响应较敏感。树轮图像分析法建立的8种年表特征进行对比发现，恰依恰孜宽度年表对气候的响应最为强烈；而阿乌里亚乔克标准化灰度年表对气候的响应较好。相关分析表明，全轮灰度、早材灰度和最大灰度与4、5月气温相关较好。4月降水和实测宽度、全轮宽度以及早材宽度相关较好，而6月降水与全轮灰度和早材灰度相关较好。早材宽度对气候的响应强于晚材宽度；全轮灰度和早材灰度对气候的响应较好。利用树轮图像分析所得到的8个树轮参数年表可增加气候重建代用指标，提高气候重建的精度。

Development of the Tree-ring Grey Chronology and Climate Significance in Northern Slope of Wusun Mountains

Tree-ring samples collected from three sites in northern slope of Wusun Mountains in 2006 were used to develop tree-ring width chronologies using standard dendrochronological methods. Further using image analysis of tree-ring, three kinds of width chronologies and five kinds of gray chronologies were developed. Contrasting the measured width chronologies, it＇s found that the tree-ring response to climate is stronger in southern Xinjiang than in the northern, in other parts of northern Xinjiang than in Yili area, in northern slope of Wusun Mountains than in the other parts of Yili area, and it＇s more sensitive in northern slope of Wusun Mountains. Analyses of the three width chronologies and the five gray chronologies developed by tree-ring image technology indicate that the Qiayiqiazi width chronology and the Awuliyaqiaoke gray chronology are the strongest and stronger on the climate response respectively. Correlation analysis between chronologies and climate shows that whole gray chronology, early wood gray chronology and maximum gray chronology are closely related to April-May temperature. Precipitation in April correlates better with measured width chronology, whole ring width chronology and early wood width chronology, and precipitation in June correlates better with whole ring gray chronology and early wood gray chronology. Early wood width chronology is stronger than late wood width chronology on tree-ring response to climate, whole ring gray chronology and early wood gray chronology are better response to climate than late wood gray chronology and minimum gray chronology. Eight tree-ring parameters obtained by image analysis of tree-ring can increase the climatic proxies for reconstruction and improve the accuracy of climate reconstruction.