1985-2020年气候因子对章古台沙地樟子松人工林径向生长的影响

Effects of Climatic Factors on Radial Growth of Pinus sylvestris var.mongolica Plantation in Sandy Land From 1985-2020

为确定未来气候变化背景下樟子松径向生长的规律,以章古台地区沙地樟子松为例,采用树轮年代学的方法,建立章古台地区樟子松差值年表,确定影响沙地樟子松生长的主要气候因子;并收集研究区气象数据,利用线性回归分析章古台地区降雨量和温度的变化趋势;利用Pearson相关系数分析树木生长与气候因子间关系。结果表明:章古台地区的年平均降水量和年平均温度年际间变化比较剧烈,年平均降雨量总体呈下降趋势,年平均气温总体呈上升趋势,该地区未来的气候呈暖干化的发展趋势;樟子松径向生长总体上与降水呈正相关,与温度呈负相关关系,其中,径向生长量与当年4~5月降雨量显著正相关(R^(2)为0.472,p<0.05),与7月气温呈显著负相关(R^(2)为-0.391,p<0.05),即生长季早期降水是樟子松春材生长的主要影响因素,而7月高温则限制了樟子松秋材生长;章古台地区4~5月的降雨量之和呈增加趋势,未来樟子松春材生长量将继续增加,且未来章古台地区7月气温将持续增加,樟子松秋材的生长将越来越受到抑制。随着气候变化,未来章古台地区的气候可能加剧樟子松人工林生长同时缩短樟子松生长周期。研究结果可为气候变化背景下的沙地樟子松人工林的经营与管理提供科学依据。

This study tried to determine the radial growth of Pinus sylvestris var.mongolica under the background of global climate change.We established the standard chronologies of Pinus sylvestris var.mongolica by using the method of dendrochronology and determined the main climate factors affecting the growth of Pinus sylvestris var.mongolica in the sandland.The meteorological data in the study area were collected,and the trend of precipitation and temperature in Zhanggutai was analyzed by linear regression.The pearson correlation coefficient was used to analyze the relationship between tree growth and climate factors.The results showed that the annual average precipitation and the annual average temperature in Zhanggutai changed sharply between the years.The annual average precipitation showed a downward trend and the annual average temperature showed an upward trend.The future climate in this region showed a trend of warming and drying.The radial growth of Pinus sylvestris var.mongolica was positively correlated with precipitation and negatively correlated with temperature.The radial growth was significantly positively correlated with the rainfall from April to May of the year(R^(2)=0.472,p<0.05)and negatively correlated with the temperature in July(R^(2)=-0.391,p<0.05).The early precipitation in the growing season was the main factor for the growth of the spring wood of Pinus sylvestris var.mongolica,while the high temperature in July restricted the growth of autumn wood of Pinus sylvestris var.mongolica.The sum of rainfall from April to May in Zhanggutai showed an increasing trend.The growth of spring wood of Pinus sylvestris var.mongolica would increase in the future.The temperature in July in Zhanggutai would increase,and the growth of autumn wood of Pinus sylvestris var.mongolica would be restrained.The climate in Zhanggutai in the future may intensify the growth of Pinus sylvestris var.mongolica plantation and shorten the growth of Pinus sylvestris var.mongolica.This study could provide the scientific basis for the management of Pinus sylvestris var.mongolica plantation in the sandy land under the background of climate change.