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《Acta Prataculturae Sinica》 2017-01
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Effect of grazing on Stipa breviflora age dynamics and leaf traits

LIU Wen-Ting;WEI Zhi-Jun;LV Shi-Jie;WANG Tian-Le;ZHANG Shuang;HAI Song;College of Grassland,Resources and Environmental,Inner Mongolia Agricultural University;College of Science,Inner Mongolia Agricultural University;Seismological Bureau,Sonid Right Banner;  
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 regulation of plant responses to grazing through population age dynamics and leaf traits of Stipa breviflorain 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 lengthwidth 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 drymatter content changed synergistically with the age sensitive traits.Leaf rolling index was significantly negatively correlated with leaf dry weight,and was positively related with leaf erectness(e.g.age classⅢand 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.
【Fund】: 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);; 内蒙古自然科学基金(2015MS0349)资助
【CateGory Index】: S812
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