Photosynthesis in relation to leaf nitrogen, phosphorus and specific leaf area of seedlings and saplings in tropical montane rain forests of Hainan Island, south China |
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Authors: | Fude Liu Ming Zhang Wenjin Wang Shuning Chen Jianwei Zheng Wenjie Yang Fengqin Hu Shuqing An |
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Institution: | (1) Laboratory of Forest Ecology and Global Changes, School of Life Science, Nanjing University, Nanjing, 210093, China;(2) Water Conservancy Research Institute of Shandong Province, Jinan, 250013, China;(3) Nanjing Institute of Environmental Sciences, Nanjing, 210042, China;(4) Shanghai Garden Administration Bureau, Shanghai, 200023, China |
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Abstract: | In order to make clear the relationships between photosynthesis and leaf N, leaf P and SLA of tropical trees, and test the
differences in the relationships among life-form groups (trees, shrub-like trees and shrubs), seedlings and saplings of 101
species from a tropical montane rain forest, located in the Diaoluo Mountain of Hainan Island, were selected. The net photosynthesis
based on area and mass (A
area and A
mass), leaf nitrogen content based on area and mass (N
area and N
mass), leaf phosphorus content based on area and mass (P
area and P
mass) and specific leaf area (SLA) were measured and/or calculated. The results showed that A
area and A
mass tended to follow the order of shrubs > trees > shrub-like trees. One-way ANOVA showed that the difference in A
area between shrubs and shrub-like trees was significant (p<0.05), and for A
mass there were significant differences between shrubs and shrub-like trees and between shrubs and tree species (p<0.05). The relationships between A
area and N
mass were highly significant in all three life-form groups and for all species (p<0.0001). The correlation between A
area and P
mass was highly significant in shrubs (p = 0.0038), shrub-like trees (p < 0.0002) and for all species (p<0.0001), but not significant in trees (p>0.05). The relationship between A
area and SLAwas highly significant in shrubs (p = 0.0006), trees (p<0.0001) and for all species (p<0.0001), however this relation was not significant in shrub-like trees (p>0.05). The relationships between A
mass and leaf N and SLA were highly significant in all three life-form groups and for all species (p<0.0001). For A
mass and leaf P, there were significant correlations in tree groups (p = 0.0377) and highly significant correlations in shrub groups (p = 0.0004), shrub-like tree groups (p = 0.0018) and for all species (p < 0.0001). Stepwise regression showed that predicted A
mass values were closer to the observed values than those for predicted A
area values. Thus, it can be concluded that the relationships obtained from seedling and sapling measurements are close to those
from mature individuals; correlations between photosynthesis and N
mass, P
mass and SLA traits are significant and the relationships are stronger and more stable for A
mass than for A
area.
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Translated from Acta Ecologica Sinica, 2007, 27(11): 4651–4661 译自:生态学报] |
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Keywords: | photosynthesis tropical montane rain forest sapling leaf nitrogen and phosphorus specific leaf area |
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