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权衡关系是生活史对策理论的基础,叶大小-数量的权衡关系对理解不同生境下植物生物量分配具有重要的意义。采用标准化主轴估计(standardized major axis estimation,SMA)方法,研究了西北半干旱区兰州市北山各坡向人工林刺槐叶数量和大小的生长关系。结果表明:随坡向由北坡向东坡、西坡和南坡转变,植物群落盖度、高度和土壤含水量逐渐减小,刺槐小枝单叶面积和单叶片干重逐渐减小,出叶强度逐渐增大;4个坡向刺槐小枝出叶强度与单叶面积、单叶片干重均呈显著的负相关关系(P<0.05),并存在接近-1的共同斜率;随坡向由北坡向东坡、西坡和南坡转变,出叶强度与单叶面积、单叶片干重四组关系的回归方程截距均逐渐减小。刺槐叶大小-数量的权衡关系,反映了植物功能性状对异质生境的响应和适应,以及植物资源分配的权衡机制。
The trade-off relationship is the basis of life history strategy theory. The trade-off relationship between leaf size and quantity is of great significance to understanding plant biomass distribution in different habitats. The standardized major axis estimation (SMA) method was used to study the relationship between the quantity and size of Robinia pseudoacacia leaves on each slope in Northwest semi-arid area of Lanzhou City. The results showed that with the slope changing from the north slope to the east slope, the west slope and the south slope, the plant community coverage, height and soil water content decreased gradually. The area of single leaflet and the dry weight of single blade decreased gradually, (P <0.05), and there was a common slope close to -1; with the slope from north to north The intercepts of the regression equations of the four groups of leaf strength, leaf area and leaf dry weight decreased gradually from the slope to the east slope, the west slope and the south slope. Robinia pseudoacacia size - the tradeoff between quantity and quantity, reflecting the response of plant functional traits to heterogeneous habitats and adaptation, and the trade-off mechanism of plant resource allocation.