摘要
为研究塔里木河下游长期干旱胁迫输水后胡杨主要测树因子的响应特征及相互关系,对不同地下水埋深条件下胡杨胸径、冠幅、树高进行了实地调查。结果表明,随离河距离增加(地下水埋深下降),胡杨冠幅、树高逐渐减小,但胸径变化没有规律性。将调查数据按径阶进行冠幅与胸径、胸径与树高间的相关分析,结果表明其显著相关。用胡杨胸径与树高模型预测树高的平均精度为90.08%,随着地下水埋深下降,模型拟合精度逐渐降低;用胡杨冠幅与胸径模型预测胸径的平均精度为81.37%,模型拟合精度随地下水埋深变化的规律性不明显,这是胡杨经历长期干旱胁迫输水后地下水埋深条件不一致的客观表征。
In order to study the response characteristics and relationship among main factors of Populus euphratica after water delivery in lower reaches of Tarim River, Xinjiang of northwestern China, the diameter at breast height(DBH), tree-crown and height of P. euphratica were investigated, and their correlation was analyzed. The results showed that the tree-crown and height decreased with the increase of distance from river, while the changes of DBH had no regularity. Field data was grouped by diameter class, and the correlation analysis of tree-crown, DBH and height showed that there was a significant correlation among them. The precision of model established between DBH and height reached 90.08%. The fitting accuracy of models decreased gradually with the decline of groundwater level. The average precision of the models established between tree-crown and DBH was 81.37% , and the fitting precision of them did not show obvious regularity as the changes of groundwater level. All of these were regarded as the mancifestation of P. euphratica responding to groundwater level after a long term drought stress.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2012年第2期34-38,共5页
Journal of Beijing Forestry University
基金
国家自然科学基金项目(40961027)
新疆草地资源与生态实验室项目
关键词
胡杨
胸径
冠幅
树高
相关分析
Populus euphratica
diameter at breast height
tree-crown
tree height
correlation analysis