不同放牧强度对糙隐子草功能性状的影响

以典型草原退化群落优势种糙隐子草为研究对象,探究其植株茎秆、叶片、根系等形态特征及生物量等功能性状指标对不同放牧强度的响应,结果表明:(1)轻度放牧和适度放牧对糙隐子草茎叶功能性状指标均无显著影响,重度放牧和极重度放牧使糙隐子草的株高较对照显著降低20.24％和21.09％,使糙隐子草的叶长较对照显著降低23.50％和...

Effects of Different Grazing Intensities on Functional Traits of Cleistogenes squarrosa

As a dominant plant of degraded community in typical grassland,Cleistogenes squarrosa was used as the research subject to explore the response of stem,leaf,root functional traits and biomass to different grazing intensities.The results showed that the stem and leaf functional traits of C.squarrosa were not changed under light and moderate grazing conditions.However,the plant height of C.squarrosa under heavy grazing and extremely heavy grazing conditions were decreased by 20.24%and 21.09%respectively,and the leaf length decreased by 23.50%and 23.24%respectively,compared with the control,while the stem diameter was increased by 35.00%under heavy grazing condition.With the increase of grazing intensity,the root length,surface area and volume,and stem,leaf and root biomass of C.squarrosa showed a trend of decreasing firstly and increased subsequently,in which the lowest values were shown under heavy grazing conditions.Pearson correlation analysis showed that the plant height,leaf length and tiller number were significantly correlated with aboveground biomass.The root biomass was significantly correlated with total root length,surface area,volume and root tip number.The correlation between aboveground biomass and root biomass was extremely significant.In conclusion,under different grazing intensities,C.squarrosa was adapted to grazing induced environmental changes by altering functional traits of stem,leaf and root,so as to keep a proper ratio in typical steppe.