草业学报2017，Vol.26Issue(1)：63-71,9.DOI:10.11686/cyxb2016277
放牧调控对短花针茅种群年龄及叶性状的影响
Effect of grazing on Stipa breviflora age dynamics and leaf traits
摘要
Abstract
The regulation mechanism of plant population structure and function by herbivores is an important part of grazing ecology.A long-term grazing study in Xilingol was used to reveal the mechanisms of the regula-tion of plant responses to grazing through population age dynamics and leaf traits of Stipa breviflora in desert grassland.The result showed that few S .breviflora plants with base diameter of less than 4 mm survived. There was little difference between moderate grazing and no grazing.The frequency and proportion of age classⅢ plants was reduced 0.79 and 0.73 respectively by heavy grazing.S .breviflora population were relatively stable.Two way ANOVA showed that leaf height,leaf length,leaf dry weight,leaf erectness and leaf length-width ratio were sensitive to grazing in different age classes.By contrast,leaf width,leaf rolling index and leaf dry matter content were not affected by age class.Correlation analysis suggested that leaf width and leaf dry matter content changed synergistically with the age sensitive traits.Leaf rolling index was significantly nega-tively correlated with leaf dry weight,and was positively related with leaf erectness (e.g.age class Ⅲ and classⅠ).The study suggested that S .breviflora completed its life history and adapted to grazing by controlling population age and leaf traits in a metastable state.关键词
种群年龄/叶性状/放牧/短花针茅/荒漠草地Key words
population age/leaf trait/grazing/Stipa breviflora/desert grassland引用本文复制引用
刘文亭,卫智军,吕世杰,王天乐,张爽,海松..放牧调控对短花针茅种群年龄及叶性状的影响[J].草业学报,2017,26(1):63-71,9.基金项目
国家自然科学基金项目（31460126），国家重点基础研究发展计划（2014CB138805），内蒙古自治区博士研究生科研创新项目（B20161012906Z）和内蒙古自然科学基金（2015MS0349）资助。 （）
