神农架常绿落叶阔叶混交林碳氮磷化学计量比

doi:10.17521/cjpe.2019.0064

摘要/Abstract

摘要：

生态化学计量学是研究生态过程中化学元素平衡的科学, 碳(C)、氮(N)、磷(P)化学计量比是生态系统过程及其功能的重要特征。该研究测定了神农架常绿落叶阔叶混交林植物器官、凋落物及土壤的C、N、P含量, 利用生物量加权法计算其化学计量比, 并分析该生态系统不同组分间及不同器官间化学计量比的差异。研究结果发现: 在不同组分之间, C含量、C:N及C:P表现为植物>凋落物>土壤; N、P含量及N:P表现为凋落物>植物>土壤。在不同植物器官间, C含量的差异较小, 其变异系数相对N、P含量较低且保持稳定; N、P含量为叶片最高且变异系数最低; N:P为树皮最高, 而枝的变异系数最低。常绿与落叶树种的叶片N、P含量差异显著。与不同森林类型的化学计量比相比, 该常绿落叶阔叶混交林植物群落的C:P及N:P较低, 凋落物的C:P及N:P较高, 土壤的C、N、P化学计量比与亚热带常绿阔叶林基本一致, 生态系统的C:N相对较低。利用生物量加权法计算得到的该森林生态系统不同组分的C、N、P化学计量比的大小关系与前人利用枝叶取样算术平均的结果存在较大差异。C、N、P含量及其化学计量比在不同器官的分配及内稳性与器官的生理功能关系密切。

关键词: 生物量加权法, 器官, 植物群落, 生态系统, 内稳态

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

刘璐, 葛结林, 舒化伟, 赵常明, 徐文婷, 申国珍, 谢宗强. 神农架常绿落叶阔叶混交林碳氮磷化学计量比. 植物生态学报, 2019, 43(6): 482-489. DOI: 10.17521/cjpe.2019.0064

LIU Lu, GE Jie-Lin, SHU Hua-Wei, ZHAO Chang-Ming, XU Wen-Ting, SHEN Guo-Zhen, XIE Zong-Qiang. C, N and P stoichiometric ratios in mixed evergreen and deciduous broadleaved forests in Shennongjia, China. Chinese Journal of Plant Ecology, 2019, 43(6): 482-489. DOI: 10.17521/cjpe.2019.0064

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2019.0064

https://www.plant-ecology.com/CN/Y2019/V43/I6/482

图/表 5

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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

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

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)

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)

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