摘要
了解树木径向生长对气候响应的区域特征是模拟或预测未来全球变化如何对森林生态系统产生影响的基础。对青藏高原东北部(祁丰)干旱气候条件下与南部(林周)高寒半干旱气候条件下的两条标准化年表分析发现,两年表敏感度均较高,样芯间一致性均较强,为分析树木径向生长对气候要素的响应关系提供了保障。对祁丰和林周树轮宽度序列与其附近酒泉(1951—2009年)和当雄(1963—2009年)气象站上年5月到当年9月的气候因子(月平均气温、月最高气温、月平均最低温和月降水量)进行相关和响应分析发现,祁丰和林周树木的径向生长与当年5—6月平均气温存在负相关关系,相关系数分别为-0.360和-0.466;而与当年5—6月降水量显著正相关,相关系数分别为0.499和0.623。祁丰和林周树轮宽度序列与帕尔默干旱指数(PDSI,1951—2005年)的格网数据在每个月份均呈正相关关系,与5—6月的相关值分别为0.581和0.719。上年7月到当年6月的降水量与祁丰(r=0.529)和林周(r=0.667)树轮宽度序列的相关值也较高,推断干旱状况是限制高原东北部与南部树木径向生长的主要因素。
Research on the response of tree radial growth to climate factors at different regions is a basic work for modeling or predicting influences of climate change on forest ecosystem.The statistical characteristics of tree-ring standard chronologies in the northeastern（Qifeng,QF） and southern（Linzhou,LZ） Tibetan Plateau showed high sensitivity as well as good consistency,verified the credibility of the relationships between tree radial growth and climatic parameters.Correlation and response analysis of QF and LZ tree-ring width series and climate factors（monthly mean temperature,monthly mean maximum temperature,monthly mean minimum temperature and monthly precipitation） from previous May to current September in Jiuquan（1951-2009） and Dangxiong（1963-2009） meteorological stations showed that both QF and LZ tree-ring width series were negatively correlated with May-June temperature with the correlation coefficients of-0.360 and-0.466,and positively correlated with May-June precipitation with the correlation coefficients of 0.499 and 0.623,respectively.QF and LZ tree-ring width series were positively correlated with monthly Palmer Drought Severity Index（PDSI） for each month during 1951-2005.We found that May-June PDSI showed the highest correlations with QF and LZ tree-ring width series by correlation coefficients of 0.581 and 0.719,respectively.Precipitation from previous July to current June also showed higher correlations with QF and LZ tree-ring width series by correlation coefficients of 0.529 and 0.667,respectively.Therefore,it is considered that moisture conditions may be the main limiting factor to tree radial growth in the northeastern and southern Tibetan Plateau.
出处
《中国沙漠》
CSCD
北大核心
2013年第4期1117-1123,共7页
Journal of Desert Research
基金
国家重大科学研究计划课题(2010CB950104)
国家自然科学基金项目(41071130
41002050)共同资助
关键词
树轮序列
气候要素
相关和响应分析
青藏高原
tree-ring
correlation and response
correlation-response analysis
Tibetan Plateau
