浙江省重点公益林松类生物量模型研究

Establishment of the Biomass Model for Pine in Key Ecological Forest in Zhejiang

根据浙江省森林群落和树种分布特点,在浙江省200万hm2重点公益林范围内,按气候区、林分类型、林龄组成、立地条件、林分组成等设置松类树种(包括马尾松、黄山松、湿地松、华南松和火炬松)典型样地122个,实测标准木255株。通过相关分析表明,树干干重、木材干重、皮干重、枝干重、冠干重、根干重与胸径和树高的相关系数较大,其冠干重、枝干重、叶干重则与胸径和树高以及枝下高有较大的相关系数,从变量得到的简洁性和准确性考虑,经不同模型的拟合和检验,确定了松类生物量各器官的独立模型,总量、木材、树皮、树根、树干的模型结构为W=c1Dc2Hc3,树叶、树枝、树冠的模型结构为W=c1Dc2Lc3;拟合了浙江省重点公益林松类生物量各器官及总量的独立模型和相容性模型,经检验,各模型均具有较好的拟合精度和预估水平,样本总体预估精度指标(P%)在多数分量中以相容性模型最高,而且相对误差绝对值指标(E2%)最小,总量、木材,树干、树皮的预估精度超过了独立模型,其他分量仍保持了独立模型的水平;而且相对误差绝对值均略高于或等于独立模型。

Based on distribution properties of forest community and species in Zhejiang province, 122 typical sample plots for pines （including Pings massoniana, P, taiwanensis, P, elliotii, P. kwangtungensis and P. taeda） were set up according to the climatic region, stand type, age composition, site conditions, compostion of stand and 255 standard trees were surveyed in the 2 millions hectares key ecological forest in Zhejiang,The correlative analysis indicated that dry weight of trunk, timber, bark, branch, crown and root had large coefficient with tree DBH and height. Dry weight of crown, branche and leaf had the same coefficient with tree DBH, height and clear bole height. By fitting and examination of different models, biomass models of each organ were determined. Model structure for the total biomass, timber, bark, root and trunk was W=c1D^c2H^c3, that for leaf, branch and crown was W=c1D^c2L^c3. Examination of models showed the good fitting precision and estimation. Consitant model had the highest estimation precision （P%） of the samples with the smallest relative error value （E2%）, Estimation precision of total biomass, timber, truch and bark was better than that by different organ models, the others still maintained the independent model level, moreover the relative error value was higher or equal to the independent model.