Sun Xingyue, Zhang Yujian, Qin Qianqian, Bai Yansong, Liu Yanhong
Beijing Key Laboratory of Forest Resources and Ecosystem Process, Beijing Forestry University, Beijing 100083, China.
Ying Yong Sheng Tai Xue Bao. 2023 Feb;34(2):315-323. doi: 10.13287/j.1001-9332.202301.006.
is a pioneer tree species after fire disturbance in forest communities in the Daxing'an Mountains of China. Bark, as an external structure of vascular cambium, plays an important role in protection and transport. To understand the survival strategy of under fire disturbance, we analyzed the functional traits of inner and outer bark of at different heights (0.3, 0.8 and 1.3 m) in natural secondary forest of the Daxing'an Mountains. We further quantified the explanation of three environmental factors (stand, topography and soil) and identified the key factors driving the changes in those traits. The results showed that the relative inner bark thickness of in burned plot followed an order of 0.3 m (4.7%) > 0.8 m (3.8%) > 1.3 m (3.3%), which was 28.6%, 14.4% and 3.1% higher than that in the unburned plot (30-35 years without fire disturbance), respectively. The relative outer bark thickness and the relative total bark thickness showed similar pattern with tree height. Fire had different effects on other bark functional traits of . The inner bark density of in burned plot was significantly decreased by 3.8%-5.6% and water content was significantly increased by 11.0%-12.2%, compared with that in unburned plot across the three heights. However, the contents of carbon, nitrogen, and phosphorus in inner (or outer) bark were not significantly affected by fire. Further, the mean inner bark nitrogen content at 0.3 m in burned plot (5.24 g·kg) was significantly higher than that at the other two heights (4.56-4.76 g·kg). Environmental factors explained 49.6% and 28.1% of the total variation in inner and outer bark functional traits, respectively, with the highest single explanation (18.9% or 9.9%) of soil factors. Diameter at breast height was the most important factor affecting the growth of inner and outer barks. In summary, fire affected survival strategies of (., increased the resource allocation to the base bark) via changing the environment factors, which would help improve their defense ability under fire disturbance.
是中国大兴安岭森林群落火灾干扰后的先锋树种。树皮作为维管形成层的外部结构，在保护和运输方面发挥着重要作用。为了解火灾干扰下[树种名称未提及]的生存策略，我们分析了大兴安岭天然次生林中不同高度（0.3、0.8和1.3米）的[树种名称未提及]内外树皮的功能性状。我们进一步量化了三个环境因素（林分、地形和土壤）的解释，并确定了驱动这些性状变化的关键因素。结果表明，火烧迹地中[树种名称未提及]的相对内皮厚度顺序为0.3米（4.7%）>0.8米（3.8%）>1.3米（3.3%），分别比未火烧迹地（30 - 35年无火灾干扰）高28.6%、14.4%和3.1%。相对外皮厚度和相对总树皮厚度随树高呈现相似模式。火灾对[树种名称未提及]的其他树皮功能性状有不同影响。与未火烧迹地在三个高度上相比，火烧迹地中[树种名称未提及]的内皮密度显著降低3.8% - 5.6%，含水量显著增加11.0% - 12.2%。然而，内（或外）皮中的碳、氮和磷含量受火灾影响不显著。此外，火烧迹地中0.3米处的内皮平均氮含量（5.24克·千克）显著高于其他两个高度（4.56 - 4.76克·千克）。环境因素分别解释了内皮和外皮功能性状总变异的49.6%和28.1%，其中土壤因素的单一解释最高（18.9%或9.9%）。胸径是影响内外树皮生长的最重要因素。总之，火灾通过改变环境因素影响了[树种名称未提及]的生存策略（如增加对基部树皮的资源分配），这将有助于提高其在火灾干扰下的防御能力。
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