摘要
在全球变暖背景下,树轮宽度与气候因子关系的地域差异研究,将为预测森林生产力、种群分布等变化提供重要信息。以中国东南地区马尾松为例,利用其分布中心区九岭山和分布南缘九连山两地的树轮样本,分别建立了树轮宽度差值年表,并与两地平均气温、降水量、相对湿度和日照时数4个气候因子做相关分析。结果表明:两地年表均与冬春季(1—3月)平均气温显著正相关,与上一年11月日照时数显著负相关,验证了在中国东南地区利用树轮宽度重建冬春季平均气温的可行性;九岭山年表与上一年气候因子的相关性显著高于九连山地区,表现出气候对分布中心区的马尾松生长产生更为明显的滞后效应,对该差异从两地树轮早材率角度进行了合理的解释;在不区分上一年和当年的前提下,九连山年表与生长季中晚期(7—10月)气温显著负相关,与降水和相对湿度显著正相关,而九岭山年表在该时段内与气温和日照时数显著正相关,与降水和相对湿度显著负相关,这说明生长季中晚期由高温干旱而导致的水分胁迫作用是南界马尾松径向生长的主要气候限制因子,而分布中心区的马尾松径向生长可能受到一定程度的高湿环境制约。
Under global warming background,regional disparities about the relationship between treering width and climatic factors are important information for predicting the changes of forest productivity and species distribution. Tree-ring samples were obtained from Pinus massoniana Lamb. in the center and south of its distribution,Jiuling Mountain（ JLN） and Jiulian Mountain（ JLA） respectively,in southeast of China. Ring-width residual chronologies were developed for each site and analyzed by correlation with local climatic variables. The results showed that the chronologies of both sites were in significant positive correlation with the mean temperature from current January-March while negative correlation with sunshine duration in November of last year,proving that it is feasible to reconstruct the mean temperature of winter-spring in southeastern China with the tree-ring width. The correlation between climatic factors of last year and chronology of JLN is much higher than that in JLA,showing that climate has a greater lag-effect on the radial growth of Masson pine in its center distribution area. For both sites,earlywood ratio will explain the difference; without distinguishing the last year or currentyear,chronology of JLA has a significant negative correlation with the temperature in the middle-late growing season（ from July to October） while having a significant positive correlation with precipitation and relative humidity. On the contrary,during the same period,JLN chronology has a significant positive correlation with the temperature and sunshine duration and has a significant negative correlation with precipitation and relative humidity. It can be concluded that the water-stress due to high temperature and drought in the middle-late growing season is the main climate factor to restrain the radial growth of Masson pine in the south boundary of its distribution,while radial growth of Masson pine in its center distribution area may be restricted by high relative humidity.
出处
《亚热带资源与环境学报》
2014年第4期1-8,共8页
Journal of Subtropical Resources and Environment
基金
国家自然科学基金项目(41271204)
江苏高校优势学科建设工程项目(PAPD)
关键词
马尾松
树轮宽度
气候因子
地域差异
九岭山
九连山
Pinus massoniana Lamb.
tree-ring width
climatic factors
regional disparities
Jiuling Mountain
Jiulian Mountain
