帽儿山8种常见绿化木本植物的叶片“收益递减”假说检验  

Assessing the “Diminishing Returns” Hypothesis for Eight Common Green Tree Species in the Garden of the Maoershan Mountain

作　　者：丛健 Cong Jian(Liaoning Provincial Forestry Development Service Center,Shenyang 110036,China)

机构地区：[1]辽宁省林业发展服务中心

出　　处：《防护林科技》2019年第12期32-36,共5页Protection Forest Science and Technology

摘　　要：以尚志市帽儿山8种常见绿化木本植物为对象,研究了叶片面积与质量的异速生长关系。结果表明:8个树种叶面积与叶质量异速生长斜率均小于1,即这些植物由于单位叶面积的成本随叶质量增大而不断升高。8个树种的SLA均随叶质量增大而呈降低趋势,也表明该地区叶片符合“收益递减”假说。跨树种尺度上叶片同样符合“收益递减”假说。进一步分析发现,各树种SLA与种内异速生长斜率和截距均呈正相关关系,表明异速生长的斜率和截距对叶片异速生长具有指示意义。北方地区选择绿化树种时应选择叶片和比叶面积较小的树种。Using the leaves of eight green woody species at the Maoershan Mountains in Shangzhi City of Harbin City as materials,the allometry of leaf area versus leaf mass was studied.Result indicates that the scaling exponents(log-linear transformed slope by standardized major axis regression)of the eight species are lower than one,i.e.,the cost per unit leaf area increase with increasing leaf mass for these species.The specific leaf area decrease with increasing leaf mass for all species,also indicating a“diminishing returns”relationship in this northern area.The leaves also agree with the“diminishing returns”hypothesis at the cross-species scale.Further analysis show that,the median of the specific leaf area of each species is positively related with the scaling experiment and standardized constant across species(i.e.,the regression intercept),suggesting both regression slope and intercept are indexes of leaf allometry.These findings suggested that it is difficult to grow large leaves for the northern plants,green tree species should be selected with relative small leaves and lower specific leaf area for greening.

关 键 词：叶面积 叶质量 异速生长 “收益递减”假说 帽儿山 

分 类 号：S718.3[农业科学—林学]