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以福建省天然常绿阔叶林及人工杉木林下草本层为研究对象,对其地上生物量(y)与地下生物量(x)分配关系进行研究,并对方程lg y=b+a lg x中的生长指数(a)和生长常数(b)进行计算分析,初步揭示不同森林类型草本层植物生物量分配及其随乔木层林龄变化的基本特征,探究其是否符合等速生长规律。结果显示:1天然常绿阔叶林草本层生物量随林龄增加而下降,人工杉木林草本层生物量在成熟林时期最大,幼、中龄林次之,近熟林最小;2天然常绿阔叶林幼龄林及成熟林草本层地上-地下生物量分配遵循等速生长规律,中龄林及近熟林生长指数a的95%置信区间上限接近理论值1,各林龄生长常数以成熟林<幼龄林<中龄林<近熟林;3人工杉木林草本层地上-地下生物量分配均遵循等速生长规律,各林龄生长常数以幼龄林>成熟林>近熟林>中龄林。研究表明,人为干扰对草本层地上-地下生物量分配有影响,但并未破坏其等速分配生长的规律。
Taking the natural evergreen broad-leaved forest in Fujian Province and the herb layer under artificial Chinese fir as the research object, the relationship between aboveground biomass (y) and subsurface biomass (x) distribution was studied, and the equation lg y = b + a lg (a) and growth constants (b) were calculated and analyzed to reveal the basic characteristics of plant biomass distribution and their changes with age of arborous layer in different forest types, and to explore whether they are consistent with the law of isokinetic growth. The results showed that: (1) The biomass of the herbaceous layer in natural evergreen broad-leaved forest decreased with the increasing of age. The biomass of the herb layer in the artificial Chinese fir plantation was the largest in the mature forest, followed by the young and middle-aged forest, and the near-mature forest was the lowest. According to the constant growth pattern, the upper 95% confidence interval for the growth index a of middle-aged and near-mature forests was close to the theoretical value of 1, and the growth constants of each age were mature The distribution of aboveground and belowground biomass of three artificial Chinese fir plantations followed the pattern of constant velocity growth. The growth constants of all age groups were in the order of young forest> mature forest> near-mature forest> Middle-aged forest. Studies have shown that human disturbance has an effect on the distribution of aboveground and underground biomass of the herb layer, but does not undermine the regularity of its uniform growth rate.