高寒金露梅灌丛生物量及年周转量

Estimation of Biomass and Annual Turnover Quantities of Potentilla Froticosa Shrub

采用样方调查与挖掘相结合的方法,以金露梅(P otentilla f ruticosa)灌丛多年累积枝干、地下生物量和当年新生枝叶量及6-9月冠面长度、宽度和高度为参数进行线性回归分析,结合金露梅灌丛与草本植物在样地所占比例,估算其年净初级生产量及年净固碳量。结果表明:2004年金露梅灌丛地下实际周转量为53.7 g/m2,周转率为26%;当年新生枝叶量为41.0 g/m2,年净初级生产量94.7 g/m2;以草本植物与金露梅灌丛在样地所占比例为60%和40%进行估算,2004年金露梅灌丛草甸总净初级生产量为858.3 g/m2,固碳量481.9 g/m2。

The annual net primary productivity and carbon content of the Potentilla froticosa shrub were assessed by combining sample plot investigation and unearthed P. froticosa plants measurement, and also by analyzing with linear regression equation the shrub＇s accumulated stem biomass, the belowground and the newly growing aboveground biomass which consisted of the length, width and height of the shrub canopy from June to September of the year, as well as the proportion of Potentilla froticosa shrub and herbaceous plants in the sample plots. Results show that the actual quantity of P. froticosa woody plants＇ belowground biomass turnover amounted to 53. 7 g/m^2, a turnover rate of 26%, in the year 2004, while the newly growing aboveground biomass reached 41.0 g/m^2, and the net primary production, 94.7 g/m^2. Based on the proportion of the herbaceous plants being 60% and of the Potentilla froticosa woody plants, 40%, in the sample plot, the total annual net primary productivity of Potentilla froticosa shrub measured up to 858.3 g/m^2, which converted into carbon would be 481.9 g/m^2.