平茬后不同生长年限黄柳丛生枝生物量分配与枝系构型  

Biomass Allocation and Branch Configuration of Salix gordejevii in Different Growth Years after Stumping

作　　者：刘冠志 刘果厚 兰庆 刘博 刘利红 张瑞麟[4] 董建芳 LIU Guan-zhi;LIU Guo-hou;LAN Qin;LIU Bo;LIU Li-hong;ZHANG Rui-lin;DONG Jian-fang(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot 010011,China;Natural Inner Mongolia Resources Protection and Utilization Research Center,Hohhot 010020,China;College of Agriculture,Chifeng University,Chifeng University,Chifeng 024000,China;Inner Mongolia Technical College of Mechanics and Electrics,Hohhot 010070,China;Ordos Water Conservancy Bureau,Ordos 017000,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010011 [2]内蒙古自治区自然资源保护与利用研究中心,内蒙古呼和浩特010020 [3]赤峰学院农学院,内蒙古赤峰024000 [4]内蒙古机电职业技术学院,内蒙古呼和浩特010070 [5]鄂尔多斯市水利局,内蒙古鄂尔多斯017000

出　　处：《中国草地学报》2022年第12期19-27,共9页Chinese Journal of Grassland

基　　金：内蒙古自治区自然科学基金(2021BS03023);内蒙古自治区高等学校科学技术研究项目(NJZY21462);内蒙古农业大学高层次人才引进科研启动项目(NDYB2019-22)。

摘　　要：以平茬后不同生长年限的黄柳为研究对象,通过对其丛生枝的生物量分配和分枝构型研究,探讨黄柳最佳平茬周期,以期为浑善达克沙地植被恢复提供理论支撑。结果表明:(1)黄柳丛生枝在平茬3a时生长最为旺盛,灌丛枯死率在5a时迅速增大,开始趋于衰老。(2)丛生枝尺度分析显示,叶和枝的生物量间存在权衡,随着生长年限的增加,由叶生物量分配为主导转变为枝生物量分配为主导;5a时叶生物量分配显著小于枝生物量分配,有机物的积累速率开始下降。(3)随着生长年限的增加,丛生枝总体分枝率逐渐减小,枝条的承载力逐渐由外围新枝转向内侧老枝,4a丛生枝分枝能力显著减弱。综合分析,黄柳在平茬5a时生长状况总体呈衰退趋势,建议进行新一轮平茬。In this experiment,the biomass allocation and branch configuration of clustered branches of Salix gordejevii with different growth year after stumping were studied,to explore the optimal time of stumping of S.gordejevii,in order to provide theoretical support for vegetation restoration in Hunshandake sandy land.The results showed that:(1)The growth of S.gordejevii cluster branches were the most vigorous in the third year after stumping,and the death rate of shrubs increased rapidly in the fifth year after stumping,and tended to be senescent.(2)Cluster branch scale analysis showed that there was a trade-off between leaf biomass and branch biomass.With the increase of growth years after stumping,the biomass changed from leaf allocation to branch allocation.In the fifth year after stumping,leaf biomass allocation was significantly less than branch biomass allocation,and the accumulation rate of organic matter began to decrease.(3)With the increase of growth years after stumping,the total branching rate of cluster branches decreased gradually,and the bearing capacity of branches gradually shifted from the peripheral new branches to inner old branches.The branching ability of clustered branches decreased significantly in the fourth year after stumping.Based on the comprehensive analysis,the growth of S.gordejevii in the fifth year after stumping showed a declining trend,and a new stumping period was suggested.

关 键 词：黄柳 平茬周期 生物量分配 分枝构型 浑善达克沙地 

分 类 号：Q948[生物学—植物学]