摘要
植物叶-花生长的资源分配模式,是植物与环境长期相互作用所形成的功能多样性的综合反映。本研究利用Arc GIS建立研究区域的数字高程模型(DEM),采用标准化主轴估计方法(SMA),研究了祁连山北坡荒漠草原不同坡向霸王(Zygophyllum xanthoxylum)种群小枝内叶片和花的生长关系。结果表明:随着坡向从北坡到东坡、西坡和南坡转变,草地群落密度、高度、地上生物量和土壤含水量呈逐渐减小趋势,霸王的小枝生物量、花大小、叶面积和叶数量呈逐渐减小趋势,繁殖分配呈增加趋势;不同坡向霸王叶数量、叶面积与花大小均呈显著的正相关关系(P<0.05),标准化主轴斜率显著小于1.0(P<0.01),花大小的增加速度大于叶面积和叶数量;随着坡向由北坡向东坡、西坡和南坡转变,叶面积与花大小的异速斜率逐渐减小,叶数量与花大小的异速斜率逐渐增大。坡向差异造成环境因子和植被群落的梯度性变化,影响了霸王小枝内叶花构件的生长速率,体现了荒漠区植物应对异质生境的表型可塑性和生长-繁殖的资源权衡机制。
The resource allocation pattern between leaf and flower in the process of plant growth is formed by the long-term interaction between plants and the environment, reflecting the compre- hensive function of diversity. By using the ArcGIS established regional digital elevation model （DEM） and the method of standardized major axis estimation （SMA） , this paper studied the re- lationship between the leaf and flower growth of Zygophyllum xanthoxylum population at different slope aspects on the northern slope of Qilian Mountains, Northwest China. The results showed that, with the slope aspect turning from north to east, west, and south, the plant density, height, aboveground biomass and soil moisture content of the plant community, the current-year twig biomass, flower size, leaf area and leaf number of Z. xanthoxylum decreased, while the re- productive allocation increased. Significant positive relationships between the flower size and leaf area and leaf number were found at all slope aspects （P〈0.05）, the slope of the regressions was significantly less than 1.0 （ P〈0.01 ）, and the growth speed of flower size was greater than those of leaf number and leaf area. With the aspect turning from north to east, west, and south, the al- lometric slope of leaf area and flower size decreased, and the allometrie slope of leaf number and flower size increased. Slope-induced gradual changes of environmental factors and vegetation com- munity influenced the growth rates of leaf and flower of Z. xanthoxylum. This relationship reflec- ted the phenotypie plasticity and the resource trading-off mechanism of growth/reproduction of desert plants in coping with the environmental heterogeneity.
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第5期1170-1176,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41461013,91125014)
甘肃省生态学重点学科基金资助
关键词
花大小
叶面积
叶数量
坡向
荒漠
异速生长
霸王
flower size
leaf area
leaf number
slope
desert
allometry
Zygophyllum xan-thoxylum.
作者简介
韩玲，女，1992年生，硕士研究生，主要从事生物地理学研究。E-mail：hling0327@163．com
通讯作者E-mail：zhaocz601@163．com
