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在综述国内外林木枝条相关研究成果的基础上,通过对江西省泰和县境内中国科学院千烟洲试验区湿地松Pinus elliottii枝条生长状况的调查,分析了湿地松树冠各轮枝层枝条生长规律,并建立了枝条生长与气象因子的相关关系回归模型。结果表明,同一年份枝条节间长、基径生长量随轮枝层的下降呈波动式下降趋势。枝条基径随轮枝层的下降不断增大,而在靠近树冠底部位置略微减小,各轮枝层枝条材积分布为右偏正态分布曲线,说明大枝条主要集中在冠层中下部。大量枝条样本材积与枝条基径的平方和枝条长度乘积的拟合精度只有0.67,说明该模型更适合拟合小枝条的材积。采用一元线性回归方程拟合枝条节间长、基径生长与枝条生长期主要气象因子的相关关系,回归方程的相关关系判定系数都在0.96以上(P<0.01),偏回归系数显著性检验的概率P均小于0.01。由回归方程的偏相关系数可知,枝条节间长生长量主要取决于冠层相对湿度,基径生长量与≥10℃积温呈负相关,与降水量呈正相关。图6参41
Based on the review of the related research results at home and abroad, the growth of branches of Pinus elliottii in the test area of Qianyanzhou in the Chinese Academy of Sciences in Taihe County of Jiangxi Province was analyzed. The growth patterns of the branches of the branches were analyzed. The regression model of the correlation between branch growth and meteorological factors was established. The results showed that in the same year, the length of branch nodes and the growth of base diameter fluctuated downward with the decrease of rotation of the branches. The root diameter of branches increased with the descending of the branches, but decreased slightly near the bottom of the canopy. The distribution of the branch volume distribution in each branch was a right-normal distribution curve, indicating that the branches mainly concentrated in the middle and lower part of the canopy. The fitting precision of the product of the volume of a large number of branches and the square of the diameter of a branch and the length of a branch is only 0.67, indicating that the model is more suitable for fitting the volume of branches. The linear regression equation was used to fit the relationship between the internode length, base diameter growth and main meteorological factors during the growth of shoots. The correlation coefficients of the regression equation were all above 0.96 (P <0.01), and the partial regression coefficient significant test The probability P is less than 0.01. From the partial correlation coefficient of the regression equation, the growth of the internode length mainly depends on the relative humidity of the canopy. The growth of the base diameter is negatively correlated with the accumulated temperature of ≥10 ℃ and positively correlated with the precipitation. Figure 6 Sen 41