金露梅灌丛净第一性生产力

The net primary productivity of Potentilla fruticosa shrub

甘肃天祝金强河地区金露梅灌丛的植物种类组成随海拔和地形的不同有所差异 ,构成金露梅群落的植物生活型以地面芽 ( 4 6.35% )和地下芽 ( 2 7.94 % )植物为主 ,矮高位芽 ( 14.0 2 % )和一年生植物 ( 11.6% )次之。群落的地上植物量在生长季呈单峰曲线变化 ,放牧较重的灌丛群落植物量峰值较未放牧或较轻放牧的提前 1个月出现 ,正常情况下群落、灌木、草本的地上植物量峰值一般出现于 8月 ;群落地上净第一性生产力和对总辐射的转化率分别为 2 52 .0 4 g/ (m2 ·a)和0 .0 77%。

The characteristics of community,distribution and formation pattern, net primary productivity and total radiation conversion effciency of aboveground phytomass of Potentilla fruticosa shrub under different ecological environmental conditions in Jinqiang river area, Tianzhu, Gansu province were studied. The results indicated that species and quantity of community varied with terrain and elevation. The main life forms of plants were hemicryptophytes(46.35%)and geophytes(28.89%),and phanerophytes(14.02%)and therophytes (11.6%) came the second. The peak value appeared in August,the net primary productivity and total solar energy conversion efficiency of aboveground were 252.04 g/m 2 (4 435.6 kJ/m 2 )and 0.077 3% respectively. The community phytomass of underground phytomass (3 132.2 g/m 2 DM) was 6.4 times as aboveground(555.7 g/m 2 ·DM).Seventy eight percent of aboveground phytomass distributed within 0～30 cm, and 85%～95% of underground within 0～20 cm.