| Bamboo forest is an important forest vegetation type, and its development is rapid, cutting cycle is short, yield is high, economic and ecological benefit is high. But we often need to measure the bamboo fresh weight and dry weight in the process of production, management, trade and scientific research about bamboo forest. The usual practice is to cut down before weighing. The field work is very heavy when use this method. It is difficult to meet the actual needs of bamboo production. Preparation of bamboo fresh and dry weight tables can be quickly and accurately estimate the bamboo weight. It is a effective method to calculate bamboo yield. The bamboo forest resources is rich in Yibin. Its paper industry develops well, and bamboo is highly useful. Bambusa rigida, Neosinocalamus affinis and Bambusa intermedia are three main bamboo species of Yibin. There is no related report about the three bamboo species biomass table of Yibin right now. Therefore, taking Bambusa rigida, Neosinocalamus affinis and Bambusa intermedia of Yibin as the object of study and establishing the biomass table, this paper has important significance to estimate the three bamboo species biomass quickly and accurately, evaluate the forest land productivity reasonably, improve the level of production and management of forest land, strengthen the development and utilization of bamboo, estimation the carbon storage of bamboo, and understand the carbon cycle of forest ecosystem. The results showed that:(1) The average fresh weight of Bambusa rigida Neosinocalamus affinis and Bambusa intermedia aboveground biomass were 6.90±2.96 kg,6.43±3.38 kg and 8.80±4.92 kg respectively. The average dry weight were 3.44±1.55kg,3.32±1.85 kg and 4.23±2.60 kg respectively. The average water content of culm were 48.38%,46.36%and 49.28% respectively. The average water content of branch and leaf were 52.71%,54.37%and 54.53% respectively.(2) The correlation was closely between culm biomass, leaf biomass. aboveground biomass and diameter(D0), diameter at breast height(D), height(H) of Bambusa rigida, Neosinocalamus affinis and Bambusa intermedia. Except the correlation was not significant between leaf and height, culm fresh weight the rest was significant (P<0.01)Through the comparison of multiple models ascertained the best model of the three bamboo species. The best model of Bambusa rigida organ unitary biomass model were W=aDb, and the best model of duality biomass model were W=aDbHc except the culm and aboveground dry biomass model were W=a+bD+eH. The unitary fresh weight model expression were W杆 =0.228D2.133, W枝叶=0.450D0.608 and W地上=0.479D1.782. The unitary dry weight model expression were W杆=0.131D22.043, W枝叶=0.213D0.585 and W地上=0.257D1"723. The duality fresh weight model expression were W杆=0.162Dl~59H~’886, W枝叶=0.957D1.277H-0.741 and W地 上 =0.373D1.087H0.587. The duality dry weight model expression were W地 =-2.031+0.848D+0.132H, W枝叶=0.444D1"268H’~’742 and W地上=- 1.757+1.021 D+0.081H.(3) The best model of Neosinocalamus affinis organ unitary biomass model were W=aDb except the branch and leaf were W=aebD, and the organ duality biomass model were W=aDbHe. The unitary fresh weight model expression were W杆=0.149D2~24, W枝叶 =0.189e0"347D and W地上=0.259D1.869. The unitary dry weight model expression were W杆 =0.08691"973, W枝叶=0.086e0.345D and W地上=0.137D1"847. The duality fresh weight model expression were W杆=0.104Dl.323H00.692, W枝叶=0.032D2’185H0.068 and W地上=0.145D1.520H0.523. The duality dry weight model expression were W杆 =0.053Dl’463H0.609. W枝 =0.015D2.173H00.063 and W地上---0.070D1.608H0.484.(4) The best model of Bambusa intermedia organ unitary biomass model were W=aDb, the organ duality biomass model were W=aDbHe. The unitary fresh weight model expression were W杆=0.094D2.418, W枝叶=0.145D1.523 and W地上=0.214D2.25. The unitary dry weight model expression were W杆=0.065DTM, W枝叶-=0.066D1.525 and W地上=0.12791.999. The duality fresh weight model expression were W杆=0.062D1.685H0.718, W枝叶 =0.112D1.706H0.021 and W地上=0.127Dt723H0.520. The duality dry weight model expression were W杆=0.016D2297H0.517, W枝叶=0.052D1.691H0.025 and W地上=0.03 8D2.166H0.373.(5) The unitary biomass table which established by the best unitary biomass model and solved the incompatible by adjusting the proportion has the advantages of simple, convenient and easy to operate. By test, the predicted precision of branch and leaf biomass was between 71.85% and 86.75%. The predicted precision of culm biomass was between 90.88% and 94.84%. The predicted precision of aboveground biomass was between 90.75% and 93.97%. In summary, the predicted precision of rest was more than 90% except branch and leaf was less than 90%. It proved that the unitary biomass table has the suitability, andity, and can be used for scientific research and production practice.(6) The duality biomass table was established by the best unitary biomass model which solved the incompatible by adjusting the proportion. By test, the predicted precision of branch and leaf biomass was between 67.52% and 86.67%. The predicted precision of culm biomass was between 90.30% and 94.96%. The predicted precision of aboveground biomass was between 90.50% and 95.22%. In summary, the predicted precision of rest was more than 90% except branch and leaf was less than 90%. It proved that the duality biomass table has the suitability, and can be used for scientific research and production practice. |
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