兰州北山侧柏株高与冠幅、胸径异速生长关系的坡向差异性  

Allometric relationship between height and crown width or diameter of Platycladus orientalis on different slope aspects of Lanzhou northern mountains

作　　者：史元春[1] 赵成章[1] 宋清华[1] 杜晶[1] 王继伟[1] 

机构地区：[1]西北师范大学地理与环境科学学院甘肃省湿地资源保护与产业发展工程研究中心,兰州730070

出　　处：《生态学杂志》2015年第7期1879-1885,共7页Chinese Journal of Ecology

基　　金：国家林业局林业科技推广项目([2012]5号);国家自然科学基金项目(91125014;40971039);甘肃省科技支撑计划项目(1011FKCA157);甘肃省生态学重点学科项目资助

摘　　要：植物功能性状之间的关系是其提高自身空间资源利用能力的一种生态策略,反映了植物与环境协同适应的表型可塑性机制。本文利用Arc GIS建立研究区域的数字高程模型(DEM),并提取样地坡向数据,采用标准化主轴估计(standardized major axis estimation,SMA)方法,研究了兰州市北山不同坡向人工林侧柏株高-冠幅和株高-胸径的异速生长关系。结果表明,侧柏胸径在各坡向上存在显著性差异(P<0.05),株高和冠幅在东坡和西坡之间无显著性差异(P>0.05);侧柏株高与冠幅的异速生长关系存在坡向差异,南坡冠幅的生长速率大于株高的生长速率,北坡冠幅的生长速率小于株高的生长速率,东坡和西坡株高、冠幅的生长速率相近;各坡向上侧柏胸径的生长速率均大于株高的生长速率,二者异速生长关系的坡向差异不明显(P>0.05)。侧柏冠幅、胸径与株高异速关系在各坡向上的不同表现,反映了异质性生境中植物主要构件的投资权衡机制。The relationship among plant functional traits is an ecological strategy that can en- hance their own ability to use space resources, reflecting mechanisms of phenotypic plasticity that plants can adapt to the environment. By using the ArcGIS-established regional digital elevation model （DEM） and abstracting the slope aspect data of the study area, this paper studied the al- lometric relationship between height and crown width as well as height and diameter of Platycla- dus orientalis on different slope aspects of the northern mountains of Lanzhou with the method of standardized major axis estimation （SMA）. The results showed that there were significant differ- ences in diameters of P. orientalis on different slope aspects （P〈0.05） , and there were no signif- icant differences in heights or crown widths on east and west slope aspects （P〉0.05）. There were slope aspect differences in the allometric relationship between crown width and height, which means the growth rate of crown width was greater than that of height on the south slope, but it is quite on the contrary on the north slope, in the meantime, the growth rates of height and width were similar on the west and east slopes. On all slope aspects, the growth rate of diameter was greater than that of height, and there was no obvious aspect difference in the allometric relation- ship between the diameter and height （P〉0.05）. The allometric relationships of height, crown width and diameter of P. orientalis were different on all slope aspects, which reflected the invest- ment weighing mechanism on main comlaonents of P. orientalis in heterogeneous habitats.

关 键 词：侧柏 株高 冠幅 胸径 异速生长 坡向 

分 类 号：S791.38[农业科学—林木遗传育种]