杨树生理生态指标与环境因子之间相关性分析  

The correlation analysis between Populus Simonii ecophysiological indexes and environmental factors

作　　者：庞发虎[1] 杨建伟[1,2] 庞振凌[1] 杜瑞卿[1] 

机构地区：[1]南阳师范学院生命科学院,河南南阳473061 [2]中国科学院水利部水土保持研究所,陕西杨凌712100

出　　处：《生态学报》2010年第12期3188-3197,共10页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(90302005);中国科学院知识创新基金资助项目(KZCX1-06)

摘　　要：为了揭示杨树生理生态指标与环境因子间综合复杂的关系,找出重要指标,在适宜土壤水分、中度干旱和严重干旱3种土壤水分条件下研究水分胁迫对杨树生理生长变化的影响;在人工控制条件下,研究叶片净光合速率(Pn)、叶片气孔导度(Gs)随光合有效辐射(PAR)和CO2浓度变化的反应关系;在中度干旱条件下,通过直接相关和综合相关分析,揭示各指标间相互影响的复杂关系。结果分析表明,水分胁迫对杨树生理生长变化有显著影响,是主要因子。在中度干旱条件下,对杨树有重要影响的因子依次为:光合有效辐射(PAR)、CO2浓度、大气温度(Ta);能够反映杨树生理生态特性的重要指标依次为:耗水量、蒸腾速率(Tr)、呼吸速率(R)和净光合速率(Pn).由此获得基本结论:杨树的生理生长变化受土壤水分、光合有效辐射(PAR)、大气CO2浓度和大气温度等多个环境因子的综合影响极其显著,其生理生长变化特征也宜采用多个指标来反应。直接相关分析不足以反映它们间的复杂关系,综合分析优于直接相关分析,分析方法科学合理,值得研究推广。To reveal the complex relationship between ecophysiological indexes and environmental factors of Populus simonii and find out the important indicators.Under three different conditions of adequate soil water,medium drought and severe drought,the impact of water stress on physiological growth change of Populus simonii was studied.Under the condition of manual control,net photosynthesis rate（Pn） stomatal conductance（Gs） and their changes were analyzed in response to active photosynthetic radiation and CO2 concentration;Under medium drought condition,the complex interaction between different indexes were revealed through direct correlation and integrated correlation analysis.The basic ideas of comprehensive correlation analysis were：（1） All the principal components of the variable group Y1,Y2,…,Yn executed vector synthesis according to proportion of variance contribution rate,and formated variable F1,similarly,from the main components of the variable group X1,X2,…,Xn,variable F2 was formated,then seek the F1 and F2 correlation coefficient to act as the integrated correlation coefficient R of variable group X and variable group Y.（2） Integrated correlation coefficient R was decomposed into the correlation coefficient Rij between Xi and Yj,Rijalso divided into direct and indirect correlation coefficient between Xi and Yj,thus revealed the complex relationships.Important findings：（1） Under three different soil water content,the basic physiological and comprehensive indicators of Populus simonii,such as the net photosynthetic rate（Pn）,transpiration rate（Tr）,respiration rate（R） and total water consumption,were significantly different,which indicated that water stress had an important impact on growth of Populus simonii.（2） In manual control experiment net photosynthetic rate（Pn） in Populus simonii leaves increased with the increase of photosynthetic active radiation（PAR） under average atmospheric CO2concentrations.When PAR was 0 500μmol·m-2s-1,Pn was the fastest-growin

关 键 词：杨树 生理生态指标 环境因子 综合相关分析 

分 类 号：S792.11[农业科学—林木遗传育种]