Influence of Stocking Rates on Morphological Characteristics and Biomass of Deyeuxia angustifolia
Four grazing districts:lightly grazed(0.99 AU/hm2 · month,LG),moderately grazed(1.65AU/hm2 · month,MG),heavily grazed(2.30 AU/hm2 · month,HG)and no grazed(0 AU/hm2 · month,CK) were set on Deyeuxia angustifolia meadow in northeast Sanjiang Plain,the morphological characteristics and biomass of Deyeuxia angustifolia under different grazing intensity were studied.The results showed that:(1) Grazing reduced the vertical height and node number and increased leaf laminas of Deyeuxia angustifolia; leaf number increased significantly while node number decreased significantly under moderate and heavy grazing,but light grazing showed less influence.(2) At the beginning of grazing the stem-leaf ratio under heavy grazing was significantly higher than other district(P＜0.05),and in July to August the stem-leaf ratio under moderate grazing was the greatest while that under no grazed was the least.(3) Grazing mainly affected soil surface (0～10cm) roots,and the roots number decreased in different level,the root number under heavy grazing reduced the most; lightly grazing(0.99 AU/hm2 · month) was good for maintaining high living root rate.
NETL
NSTL
万方数据
维普
