南京林业大学学报（自然科学版）2017，Vol.41Issue(2)：27-33,7.DOI:10.3969/j.issn.1000-2006.2017.02.005
三峡库区库首森林生态系统植物叶片碳氮磷化学计量特征研究
Stoichiometric characteristics of leaf carbon, nitrogen and phosphorus in forest ecosystems in the head of the Three Gorges Reservoir Area
摘要
Abstract
[Objective] Forests are important ecological barriers for the Three Gorges Reservoir Area. Therefore, a study on the stoichiometric characteristics of forest ecosystems in this area was conducted to provide significant understanding of the nutrient cycle, limiting effects and stabilizing mechanisms of ecosystems. [Method] A total of 107 samples from forest ecosystems at seven sites in the head of the Three Gorges Reservoir Area was collected to study the stoichiometric characteristics of carbon (C), nitrogen (N) and phosphorus (P) in leaves of 30 plant species (including trees, shrubs and herbs) . [Result] The C, N and P contents in leaves varied within the ranges of 352.0-506.3, 8.3-48.6 and 0.5-2.5 mg/g, with the averages of 450.2, 18.6 and 1.2 mg/g, respectively. The ratios of C/N, C/P and N/P in leaves were in the ranges of 7.6-56.5, 158.8-799.3 and 7.3-40.2, with the averages of 28.6, 450.4 and 16.9, respectively. The nutrient compositions differed significantly among the plant types. The C content of leaves was significantly higher in trees than in shrubs and herbs, and the N and P contents in leaves were significantly higher in herbs than in trees and shrubs. Compared with evergreen trees, N and P contents and N/P ratio in the leaves of deciduous trees were significant?ly high whereas the C content and C/N and C/P ratios were significantly low. The relationships between leaf C and N( P) content also showed significant differences among the plant types. There was a highly significantly, negative correla?tion between the C and N (P) contents in herb leaves, but C content was significantly negatively correlated to N con?tent, and there was no significant correlation to P content in trees. There was no significant correlation between the C and N (P) contents in shrubs. The N and P contents were significantly, positively correlated in leaves of all plant types.[Conclusion] In the forest ecosystems of the head of the Three Gorges Reservoir Area, the C content of leaves was medi?um, whereas the N and P contents in leaves were relatively lower. Our results suggest that P deficiency is the key limit?ing element for vegetation productivity.关键词
三峡库区/森林生态系统/碳/氮/磷/生态化学计量学Key words
Three Gorges Reservoir Area/forest ecosystems/carbon/nitrogen/phosphorus/ecological stoichiometry分类
农业科技引用本文复制引用
刘泽彬,程瑞梅,肖文发,王娜..三峡库区库首森林生态系统植物叶片碳氮磷化学计量特征研究[J].南京林业大学学报（自然科学版）,2017,41(2):27-33,7.基金项目
国家重点基础研究发展计划项目(2016YFD060020404) （2016YFD060020404）
