| In the latest century, global surface temperature is rising all the time. However, one important reason leading to climate warming is due to the increase in atmospheric CO2concentration. As the forest is an important carbon sink of CO2, so many scholars study on biomass and carbon sink of forest plants. Taking Dendrocalamus farinosus of sichuan basin as the object of study and basing on field investigation and laboratory sample processing, this paper studied the culm-shaped structure, biomass distribution structure and biomass models of Dendrocalamus farinosus. The data of organs’ moisture content and biomass allocation relationship is very important to the in-depth study of bamboo ecosystem, bamboo forest’s stand biomass and carbon sinks. The main findings are as follows:1. Study on the culm-shaped structure of Dendrocalamus farinosusThe variation of the relative height and relative diameter of Dendrocalamus farinosus is:while the relative height increases of2m, the relative diameter decreases20%. When the relative height gets to6, the relative diameter of Dendrocalamus farinosus gradually goes to0. The relationship model of relative height Hx and relative diameter D%is:D%=1114.031-24.419Hx+1.030Hx2. On the same culm, the base part and the top part’s wall thickness rate is bigger than that in the middle part of the culm. This indicates that the compression capacity of culm’s central part is smaller than that of its two sides. The weight of culm’s0-2m part takes the major proportion of the whole culm’s weight. The relative weight of0-2m part of Dendrocalamus farinosus’ culm is the heaviest, which is50.95%. But with the increase in relative height, the culm’s relative weight go down gradually.2. Study on the biomass structure of Dendrocalamus farinosusThe moisture content of Dendrocalamus farinosus’s organs is arranged as:leaf (56.26%)> branch (50.13%)> culm (39.79%). Gengrally, with the increase of the age, the moisture content of Dendrocalamus farinosus’ each organ decreased. The allocation of Dendrocalamus farinosus’ aboveground biomass is that, the culm takes the higher proportion, which is68.00%. The biomass proportion of culm is17.12%, which is a little higher than that of the leaf (14.88%). In the whole culm, the biomass proportion of its 0-2m part is the biggest, taking40.92%of the whole culm. With the increases of the culm height, the biomass proportion is in a downward trend. The proportion of the top part of the culm is1.54%only.3. Study on the aboveground biomass model of DendrocalamusfarinosusThe correlation between Dendrocalamus farinosus’ DBH and aboveground biomass is the biggest, with the correlation coefficient of0.912which is highly significant at0.05level. The correlation coefficient of culm biomass and DBH is0.931. Although the correlation between culm biomass, leaf biomass, DBH and height is significant, but their the correlation coefficient does not get to0.5. This study established36kinds of biomass models initially. Of these models, each organ has9different kinds. According to the evaluating indicator R2and P, this study finally established the optimal form of Dendrocalamus farinosus’ biomass models:W秆=0.034(D2H)0.755；W枝=0.212+0.003(D2H)2;W叶＝0.176+0.002(D2H)-1.733E-6(D2H)2；W地上=0.721+0.015(D2H)-6.698E-6(D2H)2。4. The establishment of stand biomass model of Dendrocalamus farinosusUsing the average biomass method, this study established the stand biomass model of Dendrocalamus farinosus in Sichuan Basin:W竹秆=0.069D2.298p;W竹枝=(-1.783+0.844D-0.066D2)p;W竹叶=(-1.544+0.724D-0.056D2)p;W地上=0.170D1.978p。In this paper, the study on the culm-shaped structure of Dendrocalamus farinosus has a breakthrough. Besides, this paper explored the problem that the biomass models are not compatible with. This study also made the the duality biomass table of Dendrocalamus farinosus which promoted the study, production and management on Dendrocalamus farinosus. |
PDF Full Text Request