Chin J Plant Ecol ›› 2019, Vol. 43 ›› Issue (6): 482-489.doi: 10.17521/cjpe.2019.0064

• Research Articles • Previous Articles     Next Articles

C, N and P stoichiometric ratios in mixed evergreen and deciduous broadleaved forests in Shennongjia, China

LIU Lu1,2,GE Jie-Lin1,SHU Hua-Wei3,ZHAO Chang-Ming1,XU Wen-Ting1,SHEN Guo-Zhen1,XIE Zong-Qiang1,2,*()   

  1. 1 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
    3 State-owned Longmenhe Forest Farm, Xingshan, Hubei 443700, China
  • Received:2019-03-22 Revised:2019-05-24 Online:2019-09-30 Published:2019-06-20
  • Contact: XIE Zong-Qiang E-mail:xie@ibcas.ac.cn
  • Supported by:
    Supported by Frontier Science Key Research Project of Chinese Academy of Sciences(QYZDY-SSW-SMC011)

Abstract:

Aims Ecological stoichiometry focuses on the balance of chemical elements in ecological processes, in which the stoichiometric ratios of carbon (C), nitrogen (N) and phosphorus (P) are important features of ecological functions. The objectives of this study were to determine the stoichiometric characteristics in different organs and components of mixed evergreen and deciduous broadleaved forests, and to examine the discrepancy in stoichiometric ratios among different components of the ecosystem and plant organs. Methods We measured the concentrations of C, N and P in different plant organs, litter and soil in a mixed evergreen and deciduous broadleaved forest in Shennongjia of Hubei Province, China, and computed the stoichiometric ratios using the biomass-weighted mean method. Important findings The C concentration, C:N and C:P of different components were ranked in the order of plant community > litter > soil, and concentrations of N and P and N:P in the order of litter > plant community > soil. There were little differences in C concentration among various organs, with the coefficient of variation (CV) much lower and less variable than that for N and P concentrations. Both N and P concentrations were highest in leaves with the lowest CV value; N:P was highest in the bark, but with the lowest CV value in branches. Additionally, there were considerable differences in N and P concentrations in leaves between evergreen and deciduous species. Compared with other forest types, this forest had lower C:P and N:P ratios in plant community, higher C:P and N:P ratios in litter, and the C, N and P stoichiometric ratios in soils were consistent with, and the C:N ratio in ecosystem was lower than, that in subtropical evergreen broadleaved forests. Our findings demonstrated the patterns of differences among components in stoichiometry using the integral biomass-weighted mean method differ from that using the arithmetic mean method in selective organs. Furthermore, the distribution and homeostasis of C, N and P concentrations and their stoichiometric ratios could be closely related to the physiology of different organs.

Key words: biomass-weighted mean method, organ, plant community, ecosystem, homeostasis

Fig. 1

The C:N:P ratios in different components and organs in trees and shrubs in forest ecosystem obtained using the biomass-?weighted mean method."

Table 1

C, N and P concentrations and their stoichiometric ratios in different components of the ecosystem"

生态系统组分 Ecosystem component C (g·kg-1) N (g·kg-1) P (g·kg-1) C:N C:P N:P
植物群落 Plant community 470.67 5.51 0.43 85.45 1 087.39 12.72
凋落物 Litter 443.90 12.23 0.46 36.30 958.92 26.42
土壤 Soil 12.94 1.04 0.21 12.45 60.58 4.86

Table 2

C, N and P concentrations, their stoichiometric ratios, and coefficients of variation in different organs "

器官 Organ C (g·kg-1) N (g·kg-1) P (g·kg-1) C:N C:P N:P
干 Trunk 473.28 (0.03) 3.19 (0.24) 0.30 (0.63) 148.39 (0.23) 1 591.32 (2.11) 10.72 (1.53)
叶 Leaf 474.94 (0.04) 17.29 (0.23) 0.97 (0.26) 27.47 (0.27) 487.33 (0.53) 17.74 (0.61)
枝 Branch 468.74 (0.03) 6.91 (0.25) 0.63 (0.33) 67.83 (0.28) 744.63 (0.38) 10.98 (0.23)
树皮 Bark 462.39 (0.05) 5.69 (0.25) 0.29 (0.40) 81.30 (0.25) 1 592.32 (0.46) 19.59 (0.37)
粗根 Thick root 465.06 (0.03) 3.52 (0.30) 0.28 (0.57) 132.16 (0.29) 1 652.41 (0.44) 12.50 (0.32)
细根 Fine root 467.06(0.04) 5.87 (0.33) 0.38 (0.43) 79.51 (0.33) 1 235.11 (0.38) 15.53 (0.38)

Table 3

N and P concentrations in different organs in evergreen and deciduous trees (mean ± SD)"

器官Organ 氮含量 N concentration (g·kg-1) 磷含量 P concentration (g·kg-1)
常绿树种 Evergreen tree 落叶树种 Deciduous tree 常绿树种 Evergreen tree 落叶树种 Deciduous tree
干 Trunk 2.67 ± 0.53a 2.81 ± 0.70a 0.23 ± 0.11a 0.25 ± 0.16a
叶 Leaf 13.66 ± 2.68a 17.81 ± 3.69b 0.84 ± 0.19a 1.06 ± 0.26b
枝 Branch 6.01 ± 1.45a 5.39 ± 1.35a 0.34 ± 0.08a 0.34 ± 0.15a
树皮 Bark 6.23 ± 1.32a 6.82 ± 1.78a 0.61 ± 0.23a 0.63 ± 0.20a
粗根 Thick root 3.34 ± 0.97a 3.61 ± 1.09a 0.29 ± 0.17a 0.30 ± 0.17a
细根 Fine root 5.18 ± 1.94a 6.01 ± 1.84a 0.49 ± 0.24a 0.38 ± 0.13b

Table 4

C, N and P stoichiometric ratios in different components of varying forest ecosystems"

寒温带针叶林
Cold temperate
coniferous forest
温带针阔混交林
Temperate conifer
broadleaf mixed
forest
暖温带落叶阔叶林
Warm temperate
deciduous
broadleaved forest
北亚热带常绿落叶阔叶混交林
North subtropical evergreen
deciduous broadleaved
mixed forest
亚热带常绿阔叶林
Subtropical evergreen
broadleaved forest
热带季雨林
Tropical
monsoon forest
植物群落
Plant
community
C:N 188.4 ± 2.4 99.1 ± 8.0 85.6 ± 3.7 85.5 98.4 ± 6.5
C:P 1 637.4 ± 9.3 954.0 ± 81.4 1 392.3 ± 68.9 1 087.4 1 493.4 ± 85.2
N:P 8.7 ± 0.1 9.7 ± 0.2 16.4 ± 0.3 12.7 15.3 ± 1.5
凋落物
Litter
C:N 30.3 ± 0.1 39.7 ± 0.9 38.8 ± 1.0 36.3 36.7 ± 0.5 38.0 ± 1.2
C:P 623.3 ± 126.5 463.5 ± 28.0 679.6 ± 27.7 958.9 710.4 ± 56.7 1 212.2 ± 82.4
N:P 20.6 ± 4.2 11.9 ± 0.8 18.4 ± 0.8 26.4 19.4 ± 1.7 32.1 ± 2.8
土壤
Soil
C:N 14.9 ± 0.4 13.6 ± 0.8 14.4 ± 0.4 13.6 14.8 ± 0.3 11.0 ± 0.2
C:P 45.3 ± 3.4 71.5 ± 6.2 58.3 ± 3.5 80.0 81.6 ± 6.7 129.1 ±10.9
N:P 3.0 ± 0.2 4.9 ± 0.3 4.2 ± 0.2 5.9 5.5 ± 0.4 11.7 ± 0.9
生态系统
Ecosystem
C:N 32.5 ± 4.7 31.8 ± 3.5 31.6 ± 2.2 25.6 38.0 ± 1.0
C:P 92.0 ± 9.1 159.5 ± 14.0 140.9 ± 12.6 168.1 248.8 ± 4.8
N:P 2.9 ± 0.2 4.8 ± 0.4 4.6 ± 0.2 6.5 6.6 ± 0.1
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