| 杉木林年龄序列地下碳分配变化 |
| |
| 引用本文： | 陈光水,杨玉盛,高人,谢锦升,杨智杰,毛艳玲.杉木林年龄序列地下碳分配变化[J].植物生态学报,2008,32(6):1285-1293. |
| |
| 作者姓名： | 陈光水 杨玉盛 高人 谢锦升 杨智杰 毛艳玲 |
| |
| 作者单位： | (福建省亚热带资源与环境重点实验室, 福建师范大学地理科学学院, 福州 350007) |
| |
| 基金项目： | 国家自然科学基金，福建省自然科学基金，福建省创新研究团队项目 |
| |
| 摘 要： | 森林地下碳分配在森林碳平衡和碳吸存中具有重要作用, 而揭示人工林生长过程中地下碳分配变化对于人工林碳汇估算和碳汇管理等有重要意义。通过采用年龄序列方法研究了杉木(Cunninghamia lanceolata)林生长过程中地下碳分配变化特点。年龄序列为福建省南平7 a生(幼龄林)、16 a生(中龄林)、21 a生(近熟林)、41 a生(成熟林)和88 a生(老龄林)的杉木林。细根净生产力测定采用连续土芯法, 根系呼吸测定采用壕沟法, 生物量增量测定采用异速生长方程, 地上年凋落物量采用凋落物收集框测定。结果表明: 杉木林细根净生产力在中龄林前没有显著差异, 维持在较高水平; 但此后则显著下降。细根净生产力/地上凋落物量比值随林龄增加而显著下降。老龄林的根系呼吸显著低于其它林龄林分, 根系呼吸与细根生物量间呈显著线性相关。中龄林和近成熟林的地下碳分配(Total belouground carbon allocation, TBCA)显著高于幼龄林和成熟林, 而老龄林的则最低。中龄林、近成熟林和成熟林的地上部分净生产力/TBCA比值显著高于幼龄林和老龄林, 而杉木林的根系碳利用效率(RCUE)则呈现出随林龄增加而降低的趋势。
|
| 关 键 词： | 杉木林 年龄序列 地下碳分配 细根净生产力 根系呼吸 |
CHANGES IN BELOWGROUND CARBON ALLOCATION IN A CHINESE FIR CHRONOSEQUENCE IN FUJIAN PROVINCE,CHINA |
| |
| CHEN Guang-Shui,YANG Yu-Sheng,GAO Ren,XIE Jin-Sheng,YANG Zhi-Jie,MAO Yan-Ling.CHANGES IN BELOWGROUND CARBON ALLOCATION IN A CHINESE FIR CHRONOSEQUENCE IN FUJIAN PROVINCE,CHINA[J].Acta Phytoecologica Sinica,2008,32(6):1285-1293. |
| |
| Authors: | CHEN Guang-Shui YANG Yu-Sheng GAO Ren XIE Jin-Sheng YANG Zhi-Jie MAO Yan-Ling |
| |
| Affiliation: | Key Laboratory of SubtropicalResources and Environments of Fujian Province, School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China |
| |
| Abstract: | Aims Total belowground carbon allocation represents an important carbon flux in forest ecosystems and is closely related to carbon sequestration. Knowledge of how it changes with stand age in forest plantations is essential for carbon accounting and carbon management. Our primary objective is to elucidate changes in total belowground carbon allocation in a Chinese fir (Cunninghamia lanceolata) chronosequence. Methods We selected an age sequence of 7 (young), 16 (middle-age), 21 (pre-mature), 41 (mature) and 88 year (old-growth) Chinese fir plantations with similar site conditions in Nanping, Fujian. Fine root production was determined by sequential soil coring, root respiration by trenching, current annual increment of tree biomass by allometric equations and annual litterfall by litter traps. Important findings Annual fine root production (Pfr) was relatively high and statistically similar prior to the middle-age stage, but decreased in the following stages. The ratio of Pfr/litterfall decreased with stand age. Root respiration, which was linearly correlated to living fine root biomass, was lower in old-growth forest than in other forests. Total belowground carbon allocation (TBCA) was higher in middle-age and pre-mature forests than in young and mature forests and was lowest in old-growth forest. The ratio of aboveground net primary production to TBCA was higher in middle-age, pre-mature and mature forests than in young and old-growth forests. Root carbon use efficiency decreased with stand age. |
| |
| Keywords: | Chinese fir chronosequence total belowground carbon allocation fine root production root respiration |
| 本文献已被 维普 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 |
|
