竞争对红松树轮生长与气候因子关系的影响

Effect of Competitionon Tree Ring Growth and Climate Factors of Pinus koraiensis

为了解竞争对红松(Pinus koraiensis)树轮生长与气候因子的关系是否存在影响,利用树木年轮气候学方法,建立红松单木树轮年表,比较不同竞争压力下树轮年表与气候因子的关系,分析竞争对树轮生长作用特征。研究表明:红松单木径向生长与6月份降水呈正相关,与6月份和当年生长季的平均温度、最高温度呈负相关。相关分析表明:竞争会加剧红松树轮生长与6月份降水响应的敏感性,而对树轮生长与温度关系影响不显著。进一步把红松按照不同径级划分后发现,竞争对不同径级红松树轮生长气候响应与降水关系的影响存在差别,其中竞争对小径级(D,D<30 cm)红松树轮生长与降水响应影响最显著,对中等(30 cm≤D<50 cm)径级的红松树轮生长与降水响应影响其次,对大径级(D≥50 cm)红松树轮生长与降水响应影响不显著,而竞争对不同径级红松树轮生长与温度关系影响不显著。总之竞争主要对红松幼树径向生长与水分条件关系的影响较大,因此,在应对气候变暖条件下的红松培育应该更注重对红松幼树生长环境中水分供应的调节。

The experiment was conducted to understand the effect of competition on the climatic response of Pinus koraiensis tree ring growth. By dendroclimatological methods, the pine chronology was established, compared with the relationship between tree ring chronology and climate factors under different competitive pressures, and the climate response characteristics of competition to tree ring growth were analyzed. Tree ring growth was positively correlated with the rainfall in June, and negatively correlated with the average temperature, the maximum temperature in June and the growing season. Competition increased the sensitivity of P. koraiensis tree ring growth to rainfall in June, but competition had no effect on the relationship between tree ring growth and temperature. By dividing P. koraiensis into different classes with diameter, competition had different effects on the relationship between rainfall in June and tree ring growth for different diameter classes, among which competition had the highest significant effect on the growth response of tree ring to rainfall in June for small diameter class(below 30 cm), followed by that in June for medium diameter class(30-50 cm), and no significant effect on the growth response of tree ring to rainfall in June for large diameter class(above 50 cm). But competition had no effect on growth response of tree ring to temperature index in all the diameter class. Therefore, competition mainly affects the relationship between the radial growth of young P. koraiensis and water conditions. Therefore, under the climate warming, the cultivation should pay more attention on the regulation of the growth environment of young P. koraiensis.