The direct and indirect effect of fire on radial growth of Pinus koraiensis trees in a northern temperate forest of China
The direct and indirect effect of fire on radial growth of Pinus koraiensis trees in a northern temperate forest of China
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DOI：
10.12657/denbio.078.011
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发表时间：
2017-07
期刊：
影响因子：
0.9
通讯作者：
Lushuang Gao;Chunyu Zhang;Xiu-hai Zhao;L. Zhang
中科院分区：
文献类型：
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作者：
Lushuang Gao;Chunyu Zhang;Xiu-hai Zhao;L. Zhang
火烧对长白山红松径向生长的长期影响还不清楚。为了量化火灾对红松径向生长的影响，我们测量了年轮宽度，并制定了两个树木年轮年表，从21个被烧毁的红松，在1857年被烧毁，以及30个对照树在长白山自然保护区，中国。正如预期的那样，在火灾发生后的前五年，被烧毁的树木的生长速度比对照树木慢。然而，从火灾发生后的第六年开始，被烧毁的树木的生长显著增加，这一增长期持续了13年，在1866年至1871年期间出现了适度的增长。燃烧和控制树之间的增长率的差异，也观察到了20年以来，温度开始显着增加，在1980年。燃烧树木倾向于负响应月最低温度，降水量和水汽压赤字（VPD），而这些因素和控制树木的径向生长之间的正相关关系变得更强。此外，竞争对径向生长的显著负效应仅见于火烧迹地。这些结果表明，火灾对植物生理过程的损害的负面和直接影响只影响火灾发生后不久的几年，然后被其间接影响所掩盖，如对气候和竞争的不同反应，这确实持续了很长一段时间。随着时间的推移对径向生长的间接影响可以解释的变化，在相对强度的气候反应和竞争引起的火灾。
The long-term effects of fire on the radial growth of Korean pines (Pinus koraiensis) in Changbai Mountain is poorly understood. In order to quantify the impact of fire on the radial growth of Korean pines, we measured ring widths and developed two tree-ring chronologies from 21 burned Korean pine trees that were damaged by fire in 1857 as well as 30 control trees in the Changbai Mountain Nature Reserve, China. As expected, the growth rates of the burned trees were slower than those of the control trees in the first five years following the fire. However, beginning six years after the fire, the growth of the burned trees increased considerably, and this period of increased growth lasted 13 years, with moderate growth occurring throughout the 1866 to 1871 period. A difference in growth rates between burned and control tress was also observed for the 20 years since temperatures began markedly increasing in 1980. Burned trees tended to respond negatively to monthly minimum temperature, precipitation, and vapor pressure deficits (VPD), whereas the positive relationship between those factors and radial growth of control trees became stronger. In addition, the significantly negative effect of competition on radial growth was only observed among burned trees. These results demonstrated that the negative and direct effect of damage to physiological plant processes by fire only affected the years shortly after a fire occurred and then became obscured by its indirect effects, such as differential responses to climate and competition, which did persist for a long time. The indirect effect on radial growth over time could be explained by the variability in the relative strength of climatic responses and competition caused by fire.