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Leaf C, N, P stoichiometry and nutrient resorption characteristics among four mangrove tree species in the Zhangjiangkou wetland, Fujian Province(PDF)

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

2020 04
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Leaf C, N, P stoichiometry and nutrient resorption characteristics among four mangrove tree species in the Zhangjiangkou wetland, Fujian Province
ZHOU Lili12 LI Shubin34 WANG Wanping3 YAN Xinyang3 CHEN Zhen1 & PAN Hui1**
1 Institute of Oceanography, Minjiang University, Fuzhou 350108, China
2 Fujian Provincial Colleges and University Engineering Research Center of Plantation Sustainable Management, Fuzhou 350002, China
3 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China 4 Chinese Fir Engineering Technology Research Center of the State Forestry and Grassland Administration , Fuzhou 350002, China
mangrove tree species C:N:P ratio nutrient limitation nutrient resorption stoichiometry

To understand the nutrient limitation pattern and nutrient-efficient utilizition strategy of mangrove species, we analysed the C, N and P concentration, stoichiometric ratios (C:N:P) and nutrient resoption efficicency in mature and senesced leaves of Kandelia candel, Aegiceras corniculatum, Avicennia marina and Bruguiear gymnorrhiza in Zhangjiang Estuary, Fujian Province, Eastern China. The results showed: (1) The concentration of C, N and P were 483.57 -568.87 g/kg, 8.53-26.15 g/kg and 0.74-1.56 g/kg in mature leaves, 441.33-512.67 g/kg, 2.59-8.93 g/kg and 0.28-0.74 g/kg in senescent leaves with the decreasing order of mature leaves > senescent leaves. The C:N, C:P and N:P ratios were 21.11-69.39, 310.96-735.87 and 11.11-34.86 in mature leaves, 49.51-207.42, 563.03-1878.98 and 7.20-11.38 in senescent leaves. The decreasing order of C:N and C:P was senescent leaves > mature leaves (except for the C:P of Avicennia marina ), but the N: P was in the contrary pattern. The concentration and stoichiometric ratios of C, N and P in these 4 mangrove species were significant different (P < 0.05). The C:N:P ratios were 311:12:1-736:35:1 and 563:11:1-1879:9:1 in mature and senescent leaves respectively. (2) The N resorption efficiency (NRE) was 47.97%-84.64% with the order of Bruguiear gymnorrhiza> Kandelia candel> Avicennia marina > Aegiceras corniculatum and the P resorption efficiecny (PRE) was 18.39%-76.81% with the order of Bruguiear gymnorrhiza> Kandelia candel> Aegiceras corniculatum> Avicennia marina . The NRE was higher than PRE among these 4 mangrove species. (3) The correlation analysis showed that NRE was significantly negatively correlated with C:N and C: P in mature leaves ( P < 0.05), PRE was significantly positively correlated with P contents and significantly negatively correlated with C:P in mature leaves (P < 0.01). The threshold value of foliar N:P ratio (14) indicated that Kandelia candel, Aegiceras corniculatum and Bruguiear gymnorrhiza was N limited, Avicennia marina was P limited, however, nutrient resorption efficiency did not respond with high N and P resorption efficiency in the corresponding species. We conclude that relative higher N resorption efficiency was nutrient utilization strategy for mangrove species to adapt to N-deficiency environment, however mangrove species would develop new adaptation mechanisms to respond to P-deficiency stress.




Last Update: 2020-01-21