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Seasonal Dynamics of Underground Biomass of Poa pratensis var. anceps cv. Qinghai

LIU Wen-hui(Qinghai Academy of Animal Science and Veterinary Medicine,Xining 810016,China)  
The accumulation dynamics of underground biomass of Poa pratensis var.anceps cv.Qinghai growing for two years in Alpine Region,Qinghai province,was studied to disclose the regulation of underground biomass accumulation.The results showed that the total underground biomass and the biomasses of main root,rhizome and capillary root varied in "U" shape along with the growth of Poa pratensis var.anceps cv.Qinghai,and their maximal biomass were accumulated at withering stage,158.07g/m2,288.36g/m2,251.64g/m2,698.07g/m2,respectively.The crucial period when main root and rhizome biomass was accumulated was in one month and a half after grass maturing and in one month and a half before the plant withering,respectively,while biomass accumulation of capillary roots was gentle during the whole growing period.The length of rhizome and number of tiller were maximal,257.18m/m2 and 6430/m2,respectively,in the withering period,the crucial period for number of tiller increasing was from grass maturity to withering period.The relation between the biomasses of root,rhizome,capillary root,the underground biomass and growth days was the function y=a+bx+cx2+dx3.The relation between the number of tiller,length of rhizome and growth days was the function y=a+bx+cx2,y=a+bx+cx2+dx3+ex4+fx5,respectively.
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