|
|||||
|
|
| 樟子松树轮δ13C的年内变化特征及其对气候要素的响应 | |
| 引用本文： | 商志远,王建,崔明星,陈振举.樟子松树轮δ13C的年内变化特征及其对气候要素的响应[J].植物生态学报,2012,36(12):1256-1267. |
| 作者姓名： | 商志远 王建 崔明星 陈振举 |
| 作者单位： | 南京师范大学地理科学学院, 南京 210023; 中国科学院东北地理与农业生态研究所, 长春 130102; 中国科学院沈阳应用生态研究所, 沈阳 110016 |
| 基金项目： | 国家重点基础研究发展规划项目;教育部长江学者创新团队基金项目 |
| 摘 要： | 对大兴安岭北部两株樟子松(Pinus sylvestris var.mongolica)树轮样品的年内稳定碳同位素比率(δ13C)进行测定,结果表明:樟子松树轮年内δ13C值在不同生长阶段总体表现出每年生长季中期最高、早期次之、晚期最低的变化特征.δ13C的年内变化趋势在幼龄期至速生期变化剧烈,成熟期至衰老期相对平缓.从幼龄期至衰老期的整个生长阶段,同时期年内δ13C的变动幅度基本为晚材大于早材.幼龄期年内晚材的δ13C一直明显高于早材,而成熟期年内早晚材δ13C的差别逐渐减小,至衰老期年内晚材δ13C已低于早材且无显著差别.树轮δ13C的年内变化主要体现在生长季中后期,即早晚材之间的过渡段至晚材.年内不同时段的d13C序列与同时段的宽度去除生长趋势序列(去趋势序列)之间的相关性随生长季节的推移而逐渐降低.当年早材宽度与前一年晚材宽度显著正相关,当年早材δ13C序列与前一年晚材宽度和当年早材宽度的去趋势合并序列呈现较显著的负相关性,与前一年晚材δ13C序列或宽度去趋势序列之间均未表现出显著的相关性.分析结果表明:早材的形成很可能来源于前一年光合作用的产物,在利用树轮年内不同材质宽度或δ13C序列进行气候环境重建时需要考虑这一点.年内早材、过渡段和晚材三个时段的δ13C分别对应于4月下旬至6月中旬土壤湿度较大、温度上升较快的时期,6月下旬至7月中旬降水增加、温度达到最高而相对湿度降低的时期,以及7月下旬至9月中旬降水增加、温度下降而相对湿度较大的时期. |
| 关 键 词： | 大兴安岭 早材 晚材 樟子松 稳定碳同位素 树轮 |
| 收稿时间： | 2012-05-09 |
| 修稿时间： | 2012-10-19 |
Intra-annual variation in δ13C from tree rings of Pinus sylvestris var. mongolica and its response to climatic factors |
|
| SHANG Zhi-Yuan,WANG Jian,CUI Ming-Xing,CHEN Zhen-Ju.Intra-annual variation in δ13C from tree rings of Pinus sylvestris var. mongolica and its response to climatic factors[J].Acta Phytoecologica Sinica,2012,36(12):1256-1267. | |
| Authors: | SHANG Zhi-Yuan WANG Jian CUI Ming-Xing CHEN Zhen-Ju |
| Affiliation: | College of Geographical Science, Nanjing Normal University, Nanjing 210023, China; Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China |
| Abstract: | Aims We assess the relationship among the carbon isotopic signatures of earlywood (EW), transitional wood (TW) and latewood (LW) from tree rings. Our aims were to investigate variation in the intra-annual stable carbon isotope ratio (δ13C) in Pinus sylvestris var. mongolica and determine the relationship between them and homologous ring width. Methods Based on two tree discs of Pinus sylvestris var. mongolica sampled from the northern part of Daxing’an Mountains in China, the EW, TW and LW were obtained with different stripping and pooling programs. After performing ring widths measurement and cross-dating, the periods analyzed were the maximum growth periods for one sample and different growth periods for the other. The holocellulose fractions were extracted and the intra-annual δ13C of samples were measured. Important findings In general, the δ13C values of TW are the highest, EW come second and LW are the lowest. The intra-annual trend of δ13C is fluctuateing prominently from the juvenile period to the fast-growing period and is smoother from the maturation period to the senescence period. The variation amplitude of LW is almost greater than EW at the same period. The δ13C of LW is always prominently higher than EW for the juvenile period. The difference between EW and LW is indistinctive for the maturation period and is negligible for the senescence period. The intra-annual variability of δ13C concentrates on the middle and later phase of the growing season. The correlation relationship between the intra-annual δ13C sequences and homologous detrended ring width sequences (dRWS) decreases with the seasons, which implies that environmental factors play a dominant role in cell formation and carbon fractionation during the middle and later phase of the growing season in each year. The ring width of EW of the current year is positively correlated with LW of the previous year (pLW). Also the δ13C of EW is negative correlated with the incorporative dRWS of EW + pLW. But the correlation between δ13C of EW and δ13C or dRWS of pLW is statistically insignificant. The growing season could be divided as: EW (from late April to middle June, with greater soil moisture and rapidly increasing temperature), TW (from late June to middle July, with lower soil moisture and maximum temperature) and LW (from late July to middle September, with greater soil moisture and decreased temperature). |
| Keywords: | Daxing&rsquo an Mountains earlywood latewood Pinus sylvestris var mongolica stable carbon isotope tree rings |
| 本文献已被 万方数据 等数据库收录！ | |
| 点击此处可从《植物生态学报》浏览原始摘要信息 | |
| 点击此处可从《植物生态学报》下载免费的PDF全文 | |
