金露梅株丛的植物量及其空间分布的研究

研究了东祁连山金露梅株丛的植物量形成规律，空间分布特点及其与立地类型的关系。结果表明，地上植物量８月底最高，６月生长最快，１０月凋落速度最快。年凋落量是年增量的７２％左右。株丛植物量Y与株丛分枝数Ｘ１、丛高Ｘ２、株丛投影面积Ｘ３成正相关关系，可用多元线性回归方程Ｙ干质量＝－３２５.３４６十１０．４２１Ｘ2＋０.１１０Ｘ３（ｒ＝０.８５７，Ｐ＜０.０１）或Ｙ鲜质量＝２１０.６３７＋７.２１８Ｘ1＋１.４００Ｘ２＋０．０８７Ｘ３（ｒ＝０．８７２．Ｐ＜０．０１）来估测，估测精度分别为９１．２％和９５.８％。地上植物量的８０％分布于０～３０ｃｍ高度内，地下植物量的８５％集中分布于０～２０ｃｍ的土层中。株丛地下植物量３７８．９ｇ／ｍ２·ＤＭ是地上植物量３２６.６ｇ／ｍ２ＤＭ的１．２倍，地下部分所占空间是地上的３５～１０.２倍。不同立地条件下金露梅株丛的分枝数不同，单枝质量差异很大。

Study on phytomass and its distribution of Potentilla fruticosa

The characteristics of spatial distribution and growth pattern of phytomass ofPotentilla fruticosa under different ecological environments in Jinqiang River area of TianzhuCounty were studied. The results indicated that the peak value of aboveground phytomassgenerally appeared in August, the highest growth rate in June, the highest withering rate inOctober respectively was the annual withered and fallen phytomass 72 % of . The annual netincrease of aboveground phytomass. The relationship between fresh weight or dry weight ofPotentilla frulicosa and its stem numbers, height, projection area of per cluster can be estimatedthrough YFW=210.637+7.218x1+1.400x2+0.087x3 or YDW=-325.346+10.421x1+2.743x2+0.110X3 (where Y is phytomass of per cluster, X1, X2 and X3 are stem number, height andprojection area of per cluster), the precision of above models were 95.8 %, 91.2 % respectively.80 % of aboveground phytomass distributes within 0-30 cm, and 85 % of underground within0--20 cm. The underground part occupied 3.5-- 10.2 times of living spatial as aboveground part.The underground space was l.2 times of the aboveground. Stem number per cluster and singlestem weight of Potentilla fruticosa varied with the environmental conditions.