红松天然种群邻体影响半径

Neighborhood interference radius of natural Pinus koraiensis population.

以天然红松种群为研究对象，采用生长方程回归分析、分段拟合判定的方法，探讨不同坡位红松邻体影响半径的变化．结果表明，红松树种邻体干扰指数与生长量呈显著负相关（R^2为0．61～0．89），相关程度因邻体影响范围和坡位而异，R^2达到最大值所对应的影响范围即为邻体影响半径；对红松树种进行邻体干扰指数与影响范围的线性分段拟合，邻体干扰指数随影响范围的增加而增加，其在一定的范围内上升较快，而超出该范围则上升幅度变缓，其转折点所对应的影响范围即为邻体影响半径，线性回归显著（R^2为0．41～0．55）；不同坡位的邻体影响半径有一定的差异，表现为下坡位=上坡位〉中坡位．

With natural Pinus koraiensis population as test object, and by the methods of growth equation regression analysis and partition fitting determination, this paper studied the neighborhood interference radius of P. koraiensis at various slope locations. The results showed that there was a significant negative correlation between the neighborhood interference index and the growth of P. koraiensis, and the correlation level varied with neighborhood interference zone and slope. The interference zone corresponding to the maximal regression coefficient R： was considered as the neighborhood interference radius. Based on the linear subsection regression between neighborhood interference index and interference zone, the neighborhood interference index increased fast and then slowly as the zone expanded, and the interference zone corresponding to the transition point was considered as the neighborhood interference radius. The neighborhood interference index was positively correlated with neighborhood interference zone, and the range of R： was 0.41 -0. 55. The neighborhood interference radius of P. koraiensis varied with slope locations in the order of lower slope = upper slope 〉 middle slope.