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Ecological stoichiometric ratio of carbon, nitrogen and phosphorus for tree, shrub and herb species in north subtropical evergreen broad-leaved forest *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2019 06
Page:
1-12
Research Field:
Articles
Publishing date:

Info

Title:
Ecological stoichiometric ratio of carbon, nitrogen and phosphorus for tree, shrub and herb species in north subtropical evergreen broad-leaved forest *
Author(s):
ZHU Liang1 GU Guojun2 XU Zhenfeng1 YOU Chengming1 MOU Ling1 DING Shuang1 ZENG Xin1 & WU Fuzhong 1**
1 Long-term Research Station of Alpine Forest Ecosystems, Provincial Key Laboratory of Ecological Forestry Engineering, Institute of Ecology andForestry, Sichuan Agricultural University, Chengdu 611130, China
2 Western Sichuan Forestry Bureau of Ngawa Tibetan and Qiang Autonomous Prefecture, Lixian 623102, China
Keywords:
north subtropical evergreen broad-leaved forest life form plant organ nutrient utilization nutrient limitation
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.02014
DocumentCode:

Abstract:
Ecological stoichiometric ratios of carbon, nitrogen and phosphorus are the key indicators of nutrient utilization and allocation in plants, which represent the living and adapt ing strategies of species in the ecosystem . However, different plants with different life forms (such as trees, shrubs and herbs) often display various stoichiometry in a ecosystem, showing varied nitrogen and phosphorus utilization characters, but lack of necessary attention Therefore, in order to understand the characteristics of nitrogen and phosphorus utilization of different life forms in the typical evergreen broad-leaved forest, 9 tree species, 3 shrub species and 4 herbs species were selected in north subtropical area of Sichuan Basin. The ecological stoichiometry of carbon, nitrogen and phosphorus were analyzed in leaves, twigs, barks, stems and roots of different species. The results showed that the concentrations of nitrogen and phosphorus of herb s were higher than those of trees and shrubs, but the carbon to nitrogen ratio, carbon to phosphorus ratio and nitrogen to phosphorus ratio of tree species were h igher than those of shrubs and herbs, which showed that tree plants may have higher utilization efficiency of nitrogen and phosphorus than those of shrubs plants and herbs plant s. The concentration of nitrogen in different organs ranked as the order of leaf > twig > bark > root > stem, while the concentration of phosphorus in different organs ranked as the order of leaf > twig > bark > stem > root. The carbon to nitrogen ratio in different organs ranked as the order of stem > root > bark > twig > leaf and the carbon to phosphorus ratio in different organs ranked as the order of stem > bark > root > twig > leaf, while the nitrogen to phosphorus ratio in different organs ranked as the order of bark > leaf > root > twig > stem. The concentration of nitrogen and phosphorus, carbon to nitrogen ratio, carbon to phosphorus ratio and nitrogen to phosphorus ratio in the same organ of three life forms were significantly different, and the nitrogen to phosphorus ratio in the leaves of trees were greater than 14 and less than 16, and the nitrogen to phosphorus ratio in the leaves of shrubs and herb s plants were less than 14, indicating that shrubs and herbs plants may be more restricted by nitrogen. These results indicated that the nutrient utilization efficiency of un derstory plants in this area were relatively lower and more strongly affected by nit rogen limitation, which provide some theoretical basis for sustainable management in similar evergreen broad-leaved forests.

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Last Update: 2019-03-28