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| Aims | |
| 作者姓名： | 张新平 王襄平 朱彪 宗占江 彭长辉 方精云 |
| 作者单位： | 北京大学城市与环境学院生态学系、北京大学地表过程与分析模拟教育部重点实验室,北京 100871 吉林省长白山科学研究院,吉林安图 133613 魁北克大学蒙特利尔分校环境科学研究所,蒙特利尔 H3C 3PB,加拿大 |
| 基金项目： | 国家自然科学基金，中国博士后科学基金 |
| 摘 要： | 在中国东北长白山、帽儿山、凉水、根河的主要森林类型中设置27个样地, 连续3年(2004~2006年)观测森林凋落物的生产量, 以研究我国东北地区森林凋落物产量及其与环境因子的关系。结果表明, 不同森林类型凋落物年产量存在显著差异, 针阔叶混交林显著高于落叶针叶林和常绿针叶林, 落叶针叶林、常绿针叶林、落叶阔叶林和针阔叶混交林的年平均产量分别为2 337、2 472、3 130和4 146 kg&;#8226;hm–2; 树叶、枝条、繁殖器官和其它组分占总凋落量的平均比例为71%、22%、6%和1%, 不同森林类型凋落物组分的比例差异较大。森林凋落物产量主要受温度限制, 降水、森林类型和群落结构无显著影响。不同组分凋落物量的影响因素不同: 树叶凋落量主要受温度和森林类型的影响; 枝条凋落量主要受降水和蓄积量的影响; 而繁殖器官凋落量则与树种的繁殖特性以及年降水有关。各组分占总凋落量的比例主要受降水影响, 树叶占凋落物比例随降水增加而下降, 枝条所占比例很小, 表现出与叶相反的变化趋势。 |
| 关 键 词： | 凋落物产量 气候 森林生态系统 中国东北地区 |
| 收稿时间： | 2008-01-25 |
LITTER FALL PRODUCTION IN RELATION TO ENVIRONMENTAL FACTORS IN NORTHEAST CHINA'S FORESTS |
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| ZHANG Xin-Ping,WANG Xiang-Ping,ZHU Biao,ZONG Zhan-Jiang,PENG Chang-Hui,FANG Jing-Yun.Aims[J].Acta Phytoecologica Sinica,2008,32(5):1031-1040. | |
| Authors: | ZHANG Xin-Ping WANG Xiang-Ping ZHU Biao ZONG Zhan-Jiang PENG Chang-Hui FANG Jing-Yun |
| Affiliation: | Department of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education, Peking University, Beijing 100871, China, Changbai Mountain Academy of Sciences in Jilin Province, Antu, Jilin 133613, China, and Institute of Environment Sciences, Montreal (UQAM), Montreal H3C 3PB, Canada |
| Abstract: | Aims Litter fall acts as a connection between plants and soil and is the key in nutrient and energy cycling of forest ecosystems. Northeast (NE) China possesses one of the largest forest carbon stocks in the country; however, large scale litter fall patterns along environmental gradients in this region remain unclear. Our objective was to determine the relationship between litter production and climate indices, forest type and community structure for this region. Methods Using data from 27 plots across NE China (recorded between 2004 and 2006 in Mt. Changbai, Mt. Mao’er, Liangshui and Genhe), we measured the litter fall for all major forest types in the region and statistically analyzed relationships between litter production and environmental factors. Important findings Annual litter fall production averaged 2 337, 2 472, 3 130 and 4 146 kg&;#8226;hm–2 for deciduous needleleaf forest, evergreen needleleaf forest, deciduous broadleaf forest and deciduous broadleaf and needleleaf mixed forest, respectively. Forest types differed greatly in composition of litter components. Mean proportions of leaf, branch and fruit for all forest types were 71%, 22% and 6%, respectively. Annual litter fall production was positively related to mean annual temperature (MAT; r=0.75, p<0.001), but was not significantly related to mean annual precipitation (MAP), forest type or community structure (p>0.05). Different litter fall components were controlled by different factors. Production of leaf litter was influenced by both MAT and forest type, and broadleaf forests showed a significantly higher leaf litter production than needleleaf forests with a similar climate. Branch litter production was mainly controlled by MAP and stand volume, while fruit litter production was affected by both forest type and MAP. Percentages of different litter components were mainly associated with MAP. Percentage of leaf litter was negatively correlated with MAP (r = –0.75, p<0.001), while percentage of branch litter showed a reverse pattern (r=0.68, p<0.001). |
| Keywords: | litter production climate forest ecosystem Northeast China |
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