青藏高原金露梅灌丛的结构特征及其生物量

STRUCTURE CHARACTERISTICS AND BIOMASS OF POTENTILLA FRUTICOSA SHRUB IN QINGHAI-XIZANG PLATEAU

通过对金露梅灌丛(Potentilla fruticosa Shrub)值物群落结构特征的定量分析结果表明,该类型由45种植物组成,隶属16科36属。其中有灌木3种,半灌木1种,草本值物41种,金露梅为建群种;生活型以地面芽植物为主(62.22%),其次为地下芽植物(28.89%),高位芽和地上芽植物仅占8.89%;不同植物类群生物量高峰期各不相同,各类群生长速率具明显的差异,其高峰期在营养生长期较高,生殖生长期较低;地上净生产量为266.72克/米~2年,所固定的太阳能为4834.23千焦耳/米~2年。光能利用率为0.0798%。

This work was carried out at the Haibei Research Station of Al-pine Meadow Ecosystem from May to September in 1985. The resultsare as follows: 1. There are about 45 spermatophyte species, amongwhich there are 16 families and 36 genera in Potentilla fruticosa shrub.There are 3 species of shrub and 1 species of half-shrub, and are41 species of herb. The dominant species is Potentilla fruticosa, and thecompanions are Kobresia capilifolia. K. humilis, Festuca rubra. Stipa peni-cillata and Potentilla nivea ect. 2. The main life form of plants is he-micryptophytes (62.22%), secont, it is geophyte (28.89%), phanero-phytes are 8.89% in Potentilla fruticosa shrub. 3. The highest period of biomass of different plant group is different. The rate of growthhave conspicuous different, it is higher in period of vegetativegrowth, and is lower in period of reproductive growth. 4. The netaboveground production is 266.72 g/m^2·a in Potentilla fruticosa shrub,and solar energy storage is 4834.23 KJ/m^2·a. The utilization rateof energy is 0.0798%. The biomass of forbs is the highest. It is 30.16%of net aboveground production. The grasses and shrub are medium,they are 24.03% and 23.95%. The sedge is the lowest, it is 14.75%.Litter is 7.11%.