海岸带复合农林业水杉林带生物量估测模型的研究

A study on biomass equations for Metasequoia glyptostroboides shelterbelt in the coastal agroforestry

根据海岸带复合农林业不同立地类型（旱作田和水旱轮作田）水杉林带生物量的测定资料，建立了水杉林带树干、树枝、树叶、地上部分、地下部分及全株生物量模型。经择优分析，确认数学模型ｌｎｙ＝ａ＋ｂ·ｌｎｘ为水杉林带各器官生物量的最优估测模型；以树冠体积（ｃ２ｈ）估测枝、叶量的效果好于以树干体积（Ｄ２Ｈ）的估测效果；

Biomass of Metasequoiag lyptostroboides shelterbelt in the coastal agroforestry was observed. Individual tree component dry weight,such as trunk stem, branch,leaf,aboveground, root and total tree were regressed against D(D —diameter at breast height), c 2h(c —crown diameter, h —crown height) and D 2H (H —total height).The statistical comparison showed that:(1)The equation“lny =a+b ·lnx” is the best estimate model.(2)The regression equations against c 2h are better than that of against D 2H when the biomass of branch and leaf is estimated.(3) The regression equations against D 2H are better than that of against c 2h when the biomass of trunk stem, aboveground, root and total tree is estimated. Authors address Forestry Research Intitute of Jiangsu Province, Nanjing 211153 PRC