伊犁绢蒿根形态结构对放牧的响应

摘要

以新疆荒漠草地典型植物种伊犁绢蒿为研究对象，探讨生长季内不同放牧压力对根形态特征的影响，结果表明：伊犁绢蒿根长随放牧压力变化的趋势为对照>重牧>轻牧>中牧；根颈长度进入生长旺盛期后随放牧压力的增大呈现先增加后降低变化趋势，最大值在轻牧区；根颈直径和破碎度最大值出现在重牧区，与对照相比，放牧显著增加了破碎度。%A typical plant Seriphidium transiliense in desert grassland in Xinjiang was used as research object,the effect of different grazing intensities on root characteristics was tested in growth seasons.The results showed that the root length change was CK>heavy grazing(HG)>light grazing(LG)>moderate grazing(MG)with the grazing pressure increase,and the crown length showed first rise and then drop,the max value in LG;but collar diameter and degree of fragmentation showed max value in HG,grazing sig-nificantly increased root degree of fragmentation compared with no grazing.