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青藏高原东北部树轮海拔梯度研究的散点图分析应用

ISSN号：1000-0240
期刊名称：冰川冻土
时间：0
页码：102-108
语言：中文
分类：Q948.11[生物学—植物学]
作者机构：[1]兰州大学西部环境教育部重点实验室,甘肃兰州730000, [2]河南大学环境与规划学院,河南开封475004
相关基金：国家自然科学基金项目（40971119）; 国家自然科学基金创新群体项目（40721061）; 国家自然科学基金重大项目（40890051）资助
相关项目：青藏高原和中东亚干旱区环境变化与地表过程研究

作者：杨涛|

关键词：树轮, 海拔梯度, 散点图, 直线回归分析, 年表主成分分析, tree-ring, elevation gradient, scatter plot, linear regression analysis, [KG1]principal component analysis of chronologies

中文摘要：

利用散点图直线回归分析结合主成分分析,研究同一坡面不同海拔的树轮宽度与气候因子的关系.由于同一山坡上随着海拔的升高气候因子表现出差异,导致不同海拔的树木生长对温度和降水的响应呈现阶梯状渐变.对树轮宽度序列和与其存在显著相关的5—7月份的气候因子进行散点图分析,得出5—7月的温度对树木的生长起主要限制作用,但是限制作用从低海拔到高海拔逐渐减弱;低海拔和中低海拔树木与7月温度负相关,中高海拔和高海拔树木受7月份高温影响变弱,相关转为正值;5—7月降水量的增加能促进树木的径向生长,但是随着海拔的增加,树木对于降水量响应变弱.由于快速降水的大部分水分都会流失,不能有效地存留在土壤里,较高海拔树木与较低海拔相比更难保留水分,所以高海拔轮宽序列保留较少的降水信息.

英文摘要：

With the principal component analysis and the scatter plot and linear regression analysis,the study of tree-ring radial growth changes with different elevations in the same brae shows that,due to the situation of combination of temperature and the moisture,growth of the trees in different elevations presents a gradual change. Applying the scatter plot analysis,the tree-ring radial growth changes with different elevations in May,June and July,when the correlations between the tree-ring index and the meteorological data is significant,are studied. the study results reveal the following aspects：temperature from May to July mainly restricts tree＇s growth,but its effect will weaken with the increase of elevation; In July,trees in the higher location are less affected by the extreme high temperature,and a minor positive correlation is showed between temperature and the tree-ring width; high precipitation promotes the growth of trees,but trees in higher elevation response less to the precipitation. Rapid rainfall cannot guarantee more moisture in the soil,especially the soil in the upper location of the brae,therefore,only a little signal of the rapid rainfall could remain in the tree＇s radial growth records.

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