青海海北地区高山蒿草草甸植物群落生物量动态及能量分配

 对青海海北地区高山草甸主要植物群落小嵩草(Kobresia pygmaea)草甸、矮嵩草(K．humilis)草甸、藏嵩草(K．tibetica)沼泽化草甸地上生物量动态和能量分配的研究结果表明，不同植物群落年地上净生产量及其年际动态和主要植物类群生物量季节动态具明显的差异，其生物量季节动态可由如下模型表示： Wi＝Ki/(1+exp(Ai-Bit)) 植物群落地上、地下生物量的垂直分布呈典型的金字塔和倒金字塔模式。小嵩草草甸、矮嵩草草甸和藏嵩草沼泽化草甸的地上净生产量依次为368.4g·m-2·a-1、418.5g·m-2·a-1和518.4g·m-2·a-1，所固定的太阳能值依次为6655.16kJ·m-2·a-1、7610.09kJ·m-2·a-1、9488.77kJ·m-2·a-1。光能利用率分别为0.1097％、0.1256％、0.1568％。

The Dynamics of Biomass and the Allocation of Energy in Alpine Kobresia Meadow Communities, Haibei Region of Qinghai Province

This paper investigates the dynamics of biomass and the allocation of energy for main communities of Kobresia pygmaea meadow, K, humilis meadow and K. tibetica swamp meadow of alpine meadow ecosystem in range of Haibei Qinghai. The results are the following: The difference were obvious in annual aboveground net production and seasonal dynamics of main group biomass among the different community types. The seasonal changes were predicted by logistic equation:Wi = Ki/( 1+ exp (Ai- Bit) ) The vertical distribution of aboveground biomass and that of belowground biomass displayed pyramidal and reverse pyramidal model,respectively. In K. pygmaea meadow, K. humilis meadow and K. tibetica swamp meadow, the aboveground net production was 368.4g·m-2·a-1, 418.5 g·m-2·a-1, 518.4g·m-2·a-1. The solar energy storage was 6650.16kJ·m-2·a-1, 7610.09kJ·m-2 ·a-1and 9488.77kJ·m-2·a-1 respectively, in the three communities. Their utilization rates of energy were 0.1097%,0.1256% and 0.1568% ,respectively.