克氏针茅功能性状对放牧强度的响应及其异速生长分析  

The Response of Stipa krylovii Functional Traits to Different Grazing Intensities and Allometric Growth Analysis

作　　者：安景源 李西良[1] 丁勇[1] 李芳[1] 郭丰辉 马晖玲[2] 高韶勃 李元恒[1] AN Jing-yuan;LI Xi-liang;DING Yong;Li Fang;GUO Feng-hui;MA Hui-ling;GAO Shao-bo;LI Yuan-heng(Grassland Research Institute,Chinese Academy of Agricultural Sciences/Key Laboratory of Grassland Ecology and Restoration of the Ministry of Agricultural,Hohhot 010010,China;College of Pratacultural Science,Gansu Agricultural University,Lanzhou 730070,China)

机构地区：[1]中国农业科学院草原研究所/农业农村部草地生态与修复治理重点实验室,内蒙古呼和浩特010010 [2]甘肃农业大学草业学院,甘肃兰州730070

出　　处：《中国草地学报》2020年第6期50-57,共8页Chinese Journal of Grassland

基　　金：内蒙古自治区科技计划项目(ZDZX2018020,2019GG009,2019ZD008);内蒙古自治区自然科学基金项目(2019MS03002,2020ZD06,2020BS03046);中央级公益性科研院所基本科研业务费(1610332020004,1610332020021)。

摘　　要：以典型草原优势种克氏针茅为研究对象,通过对比地上、地下功能性状和各构件生物量,解析茎、叶、根对长期不同放牧强度的响应。结果表明:(1)在放牧强度GI510下克氏针茅植株茎、叶功能性状变化显著,具体表现为株高变矮、叶片数变少、分蘖数变少、叶片变短变窄,植株基部茎粗与叶片厚度显著减小;(2)克氏针茅根系形态参数随放牧强度增加先增大后减小,在中度放牧GI340下克氏针茅的根系长度、表面积和体积均最大;(3)克氏针茅叶、茎、根系各个生物量及总生物量在重度放牧GI510下最低,比根长和茎叶比最高;(4)在不同放牧强度下克氏针茅株高-根长之间具有显著的异速生长关系,叶-茎生物量、地上-地下生物量之间在中度放牧GI340下表现为异速生长关系。The response of stem,leaf and root to long-term grazing intensity was analyzed by comparing the aboveground and underground functional traits and biomass of each part in Stipa krylovii,a dominant species of grassland.The results showed that the functional traits of stem and leaf of S.krylovii changed significantly under heavy grazing conditions(GI510),including lower plant height,less leaf and tiller number,shorter and narrower leaf,and decreased stem diameter and leaf thickness at the base of the plant.The root morphological parameters of S.krylovii firstly increased and subsequently decreased with the increase of grazing intensity.The maximum length,surface area,and volume of root were observed under moderate grazing intensity(GI340).The respective and total biomass of leaves,stems,roots of S.krylovii were the lowest under heavy grazing conditions(GI510),but the specific root length and the stem-leaf ratio were the highest.Under different grazing intensities,there was a significant allometric growth relationship between plant height and root length of S.krylovii.The leaf-stem biomass and above-underground biomass showed allometric growth relationship under moderate grazing intensity(GI340).

关 键 词：克氏针茅 放牧强度 功能性状 根系结构 异速生长 

分 类 号：S812[农业科学—草业科学]