摘要
为探究气候变化和抚育间伐对油松林生长的影响,选取黄土高原东部山西省临汾市吉县人工油松林中3个不同密度的林分,采用年轮生态学的方法对油松的径向生长过程进行分析.年轮宽度指数与气候因子的相关性分析表明该地区油松生长在年际尺度上与当年1月降水和上年12月最高气温负相关,与当年7月降水和10月最高气温正相关;生长释放和生长抑制分析表明由于气候变化和间伐的影响在1978-2003年之间,样方1出现了1次中度生长抑制,生长变化率低于-50%,1次由间伐引起的轻度生长释放,生长变化率大于47%;样方2出现了1次间伐产生的轻度生长释放,生长变化率超过39%;样方3出现了1次气候条件不适导致的轻度生长抑制,生长变化率低于-32%,1次由间伐和气候条件适宜共同作用产生的中度生长释放,生长变化率大于75%;间伐产生的生长释放效应能够维持5年左右.综上所述,不适宜的气候条件会抑制树木生长,间伐抚育能够使树木在5年内快速生长,结果可为后期的林业管理决策提供一定的参考.
There has been increased focus on the impacts of climate change on vegetation growth, and human activities that interfere with the vegetation. Discussing the effects of climate change and thinning activity on forest growth is essential to expand plantation areas. In this study, the dendroecological method was used to analyze the radial growth of Pinus tabulaeformis to reveal the impacts of climate change and human activities on forest stand growth. These samples were derived from three different density areas of P. tabulaeformis forest at the Linfen City of Shanxi Province (the east of Loess Plateau). The correlation analysis between tree ring width index and climatic factors indicated that the growth of P. tabulaeformis was negatively related to precipitation in January and the monthly maximum temperature in December of the previous year, whereas positively correlated with precipitation in July and the monthly maximum temperature in October in that year. The phenomena of growth release and inhibition could be attributed to the impacts of climate change and thinning during 1978-2003. However, growth inhibition was closely related to unsuitable climatic conditions. Plot 1 showed a moderate growth inhibition period when the growth variation was less than -50%, and growth release was caused by thinning. The growth variation was greater than 47% in the period of growth release. Moreover, a slight growth release occurred due to tending in plot 2, and the rate of growth change exceeded 39%. A slight growth suppression induced by uncomfortable climatic condition caused growth variation less than -32% and a moderate growth release by the interaction of cutting and comfortable counterpart made variation rate larger than 75% in plot 3. The release effects of thinning can last for about 5 years. In summary, inappropriate climatic conditions can inhibit the growth of trees, and thinning can promote tree growth by about 5 years. The results can provide a reference for local forest management.
作者
何如梦
王百田
于显威
王旭虎
刘涛
王岩松
刘臻
HE Rumeng;WANG Baitian;YU Xianwei;WANG Xuhu;LIU Tao;WANG Yansong;LIU Zhen(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Liaoning Water Conservancy Vocational College,Shenyang 110122,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2018年第6期1204-1210,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家重点研发计划项目(2016YFC0501704)资助~~
关键词
黄土高原
油松
人工林
径向生长过程
生长释放
生长抑制
the Loess Plateau
Pinus tabulaeformis
plantation forest
radial growth process
growth release
growth inhibition
