作　　者： ;

机构地区： 中山大学环境科学与工程学院环境科学系

出　　处： 《植物生态学报》 1998年第4期356-363,共8页

摘　　要： 本文研究香港桃金娘灌木林植物生物量和净第一性生产量。结果表明：（１）桃金娘茎的直径与高度与各组分的生物量有明显的相关关系。（２）桃金娘叶子占地上部活植物生物量的２０．２％，花和果如果以它的峰值计算，其占地上部活植物生物量的９．６％，茎和枝占７０．４％。（３）地上部和地下部活植物生物量分别为１５５３ｇｍ－２和１４０８ｇｍ－２，其中桃金娘分别占８５％和８２％。（４）桃金娘叶子生物量在研究期间的波动较大，但没有以年为周期的季节变化。花和果的变化则较有规律，花蕾通常于３或４月开始形成，到７月底达到峰值，然后开始下降。（５）桃金娘的净生产量为８２０ｇｍ－２ａ－１，其中，花和果占１５．２％，茎和枝占１８．８％，根和叶分别占２１．３％和４３．７％。灌木林的净第一性生产量为１０１０ｇｍ－２ａ－１。（６）由于未考虑草食和根系的枯死损失，本研究所得的净第一性生产量（尤其是根的生产量）可能偏低。 The harvest method was used to study plant biomass and net primary production (NPP) of the R.tomentosa shrubland of Hong Kong.The results show that:(1) There were obvious correlations (P<0.005) between component biomass of aboveground and diameter (or diameter and height) for R.tomentosa. Correlations of stems and branches were the highest and those of dead branches were the lowest.(2)For R.tomentosa,leaves accounted for 20.2% of aboveground living biomass.Flowers and fruits accounted for 9.6% of that when they were at their peak values.The percentage of aboveground living biomass in stems and branches was 70.4%.(3) Living biomass of aboveground and underground was 1553 g·m-2 and 1408 g·m-2, respectively.Most of the biomass was contributed by R.tomentosa.(4)Leaf production of R.tomentosa was continuous and gradual.Its biomass fluctuated during the study period.Flower buds of R.tomentosa were formed in March or April.The biomass of flowers and fruits increased rapidly from its formation to the peak value which occurred in July.Then it declined due to the death and shedding of fruits.(5)The NPP of R.tomentosa was 789 g·m-2·a-1.Of which,flowers and fruits accounted for 18.5%;stems and branches for 18.6%;roots and leaves for 20.2% and 45.4%,respectively.NPP of the shrubland was 972g·m-2·a-1.(6)The NPP could be underestimated in this study because the loss through grazing and root death was not taken accunt of.

关 键 词： 生物量 第一性生产量 桃金娘 灌木群落

领　　域： [生物学] [农业科学] [农业科学]