高寒地區(qū)青海扁莖早熟禾(poapratensisvar.ancepsgaudcv.qinghai)生長特性及生物量構成研究

1、 分類號： 密 級： U D C： 編 號：20070413102017 碩士學位論文 高寒地區(qū)青海扁莖早熟禾（Poa pratensis var. anceps Gaud cv. Qinghai）生長特性及生物量構成研究 指 導 教 師： 周青平 周青平 顏紅波 顏紅波 申請人姓名 申請人姓名： 劉文輝 劉文輝

2、 學科專業(yè)名稱 學科專業(yè)名稱： 草業(yè)科學 草業(yè)科學 研 究 方 向： 牧草栽培育種 牧草栽培育種 學院 學院(系、部 系、部) ： 青海大學 青海大學農(nóng)牧 農(nóng)牧學院 學院 二○○七年四月 II Study on Growth Character and Biomass Composition of Poa pratensis var. anceps Gaud cv. Qinghai in Al

3、pine Region LIU Wen-hui（Pratacultural Science） Directed by ZHOU Qing-ping Abstract The botany characteristics, tiller and characteristics change of seeds of the second year Poa pratensis var. anceps Gaud cv. Qinghai grow

4、ing in Alpine Region, Qinghai province were quantitatively detected to disclose the regulation of biomass accumulation, to find out the key time of biomass accumulation and tiller and to decide the optimum period for see

5、ds harvest. The main results are as follows: The biomass of stems and leaves and the total above ground biomass showed “S” curves along with the growing of Poa pratensis var. anceps, while the ear biomass was increased a

6、t beginning and then decreased. The biomass accumulations of all parts during the growth of Poa pratensis var. anceps may be presented by y＝a＋bx＋cx2＋dx3. The crucial period for leaf biomass accumulation is in the first m

7、onth after the grass recovered from winter, while that for stem and ear is in mid May and mid June respectively. The above ground biomass accumulation is mainly affected by plant height. The total under ground biomass a

8、nd the biomasses of main root, rhizome and capillary root showed “U” model presented by y＝a＋bx＋cx2＋dx3 along with the growth of Poa pratensis var. anceps. The crucial period for main root biomass and rhizome increase is

9、in a month and a half after grass maturity, in a month and a half before the plant withers respectively, while capillary root in its biomass accumulation is smooth during the whole growing period. Leaf area is the key de

10、ciding under ground biomass accumulation. The root of Poa pratensis var. anceps mainly is distributed in the soil layer of 0-5 cm. Rhizome, capillary root and the total under ground biomass displayed a “▽” type distribut

11、ion presented by exponent function in vertical in all growing period, except capillary root showed “>” type distribution in the period of recovering from winter. The change regulation of rhizome length of Poa pratensi