Li Ying-Jun, Fang Ke-Yan, Bai Mao-Wei, Cao Xin-Guang, Dong Zhi-Peng, Tang Wan-Ru, Mei Ze-Peng
Institution of Historical Geographical and Environment Change, Taiyuan Normal University, Jinzhong 030600, Shanxi, China.
College of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Ying Yong Sheng Tai Xue Bao. 2021 Oct;32(10):3539-3547. doi: 10.13287/j.1001-9332.202110.010.
is a typical pioneer afforestation tree species widely distributed in southern China. It is crucial to study the ecological resilience of to disturbances under global warming, drying, and frequent pest infestation, which can shed lights on forest mana-gements. In this study, tree-ring samples collected from old-growth trees in Baisong Village, Xianyou County, Fujian Province, were used to develop the first standard chronology of ring width (1865-2014) in this region. The results showed that the low relative humidity from July to September and the extremely high temperature from May to September were the main limiting factors for tree growth. The extremely narrow years were identified in 1869, 1889, 1986, 1991 and 1993. These extremely narrow years were exacerbated after the persistently low values of the previously two years via the superposed epoch analysis (SEA). The insect infestations were more likely to happen in dry years. Insect outbreak exerted strongest effect on tree growth in 1889. The narrow tree-rings in 1986 and 1991 were affected by both insect infestation and drought. The other extremely narrow years were mainly affected by drought. The resistance of trees to insect infestation was weaker than that to drought event. The relative resilience of trees to insect infestation was higher than that to drought event, except for 1991. The relative resilience was the highest in 1889 and the lowest in 1991 under the influence of successive extreme events. Under the enhanced drying trend since 2000, more trees had died possibly due to the combined effects of insect infestation and drought.
是一种典型的先锋造林树种，广泛分布于中国南方。研究其在全球变暖和干旱以及病虫害频发情况下对干扰的生态恢复力至关重要，这可为森林管理提供启示。在本研究中，采集了福建省仙游县白松村老龄树木的年轮样本，用于编制该地区首个年轮宽度标准年表（1865 - 2014年）。结果表明，7月至9月的低相对湿度以及5月至9月的极高温度是树木生长的主要限制因素。确定了1869年、1889年、1986年、1991年和1993年为年轮极窄年份。通过叠加周期分析（SEA）发现，在之前两年持续低值之后，这些极窄年份情况加剧。虫害在干旱年份更易发生。1889年虫害对树木生长的影响最为强烈。1986年和1991年的窄年轮受到虫害和干旱的双重影响。其他极窄年份主要受干旱影响。树木对虫害的抵抗力弱于对干旱事件的抵抗力。除1991年外，树木对虫害的相对恢复力高于对干旱事件的相对恢复力。在连续极端事件影响下，1889年相对恢复力最高，1991年最低。自2000年以来干旱趋势增强，更多树木可能因虫害和干旱的综合影响而死亡。
