哀牢山中山湿性常绿阔叶林两种优势幼苗C、N、P化学计量特征及其对N沉降增加的响应

doi:10.17521/cjpe.2015.0093

植物生态学报 ›› 2015, Vol. 39 ›› Issue (10): 962-970.DOI: 10.17521/cjpe.2015.0093

所属专题：生态化学计量

哀牢山中山湿性常绿阔叶林两种优势幼苗C、N、P化学计量特征及其对N沉降增加的响应

石贤萌^1,^2,^*, 杞金华^3,^*, 宋亮^1,^**(), 刘文耀¹, 黄俊彪^1,², 李苏¹, 卢华正^1,², 陈曦^1,²

¹中国科学院西双版纳热带植物园热带森林生态学重点实验室, 昆明 650223
²中国科学院大学, 北京 100049
³中国科学院哀牢山亚热带森林生态系统研究站, 云南景东 676209

出版日期:2015-10-01 发布日期:2015-10-24
通讯作者: 石贤萌,杞金华,宋亮
作者简介:
# 共同第一作者
基金资助:
国家自然科学基金(31300382和U1133605)、中国科学院“西部之光”人才培养计划“西部博士资助项目”和中国科学院青年创新促进会专项经费(2014356)

C, N and P stoichiometry of two dominant seedlings and their responses to nitrogen additions in the montane moist evergreen broad-leaved forest in Ailao Mountains, Yunnan

SHI Xian-Meng^1,^2,^*, QI Jin-Hua^3,^*, SONG Liang^1,^**(), LIU Wen-Yao¹, HUANG Jun-Biao^1,², LI Su¹, LU Hua-Zheng^1,², CHEN Xi^1,²

¹Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China
²University of Chinese Academy of Sciences, Beijing 100049, China
³Ailaoshan Station for Subtropical Forest Ecosystem Studies, Chinese Academy of Sciences, Jingdong, Yunnan 676209, China

Online:2015-10-01 Published:2015-10-24
Contact: Xian-Meng SHI,Jin-Hua QI,Liang SONG
About author:
# Co-first authors

摘要/Abstract

摘要：

N沉降对不同森林生态系统的影响是当今全球变化生态学研究的一个热点问题。山地湿性常绿阔叶林是我国西部高海拔地区重要的森林植被类型之一。该文以云南哀牢山中山湿性常绿阔叶林为对象, 研究了其林下优势树种多花山矾(Symplocos ramosissima)和黄心树(Machilus gamblei)幼苗不同器官中C、N、P含量和生态化学计量特征及其对N沉降增加的响应。结果表明: 两种幼苗C、N、P含量的差异均达到了显著性水平(p < 0.05), 多花山矾的C含量较低, N和P含量较高。N处理对植物幼苗元素含量及其比值影响极显著(p < 0.01), 且与物种和器官之间存在显著的交互作用。N处理提高了幼苗体内N含量, 导致不同器官N:P值有不同程度的增加。随N处理水平的升高, 多花山矾幼苗P含量下降, 黄心树幼苗P含量整体升高, 幼苗间P含量差异减小。在一定范围内, 植物幼苗N含量与土壤无机N含量之间存在极显著的相关性(p < 0.01)。不同器官之间相比, 植物幼苗根和茎的N内稳性比叶片更高, 即植物叶片对N沉降的响应更为敏感。

关键词: 生态化学计量学, N沉降, 原生林, 内稳性, 幼苗

Abstract: Aims

Montane moist evergreen broad-leaved forest is an important vegetation type in the high altitude areas of western China. In this study, total carbon (C), nitrogen (N), phosphorus (P) contents and stoichiometry in roots, stems, and leaves of two dominant seedlings, Symplocos ramosissima and Machilus gamblei, and their responses to different levels of N addition were investigated in the montane moist evergreen broad-leaved forest in Ailao Mountains, Yunnan.

Methods

A simulation experiment with four N addition levels T₀ (0 kg N·hm^-2·a^-1), T₁ (3 kg N·hm^-2·a^-1), T₂ (6 kg N·hm^-2·a^-1) and T₃ (12 kg N·hm^-2·a^-1) was carried out in the montane moist evergreen broad-leaved forest in Ailao Mountains. Total C, N and P concentrations in different organs of the two dominant seedlings and soil inorganic N concentration in each treatment were measured after one year’s in situ experiment.

Important findings

The C, N and P concentrations of the two seedlings were significantly different (p < 0.05). Machilus gamblei had lower C concentration, but higher N and P concentrations compared with S. ramosissima. N addition had significant effects (p < 0.01) on C, N and P concentrations and their stoichiometry. Significant interactions were detected among N treatments, species and plant organs. N addition increased N concentrations in all organs of the two seedlings, leading to higher ratio of N:P. P concentration of S. ramosissima decreased significantly (p < 0.05) under N addition, while that of M. gamblei increased under medium (T₂) and high (T₃) N addition treatments. Within a certain range, there was a significant correlation between the N concentrations of seedlings and soil inorganic N concentrations (p < 0.01). Comparisons of homeostasis index among different organs indicated that the N stoichiometry in roots and stems was more stable than that in leaves under N addition.

Key words: ecological stoichiometry, nitrogen deposition, primary forest, homeostasis, seedlings

石贤萌, 杞金华, 宋亮, 刘文耀, 黄俊彪, 李苏, 卢华正, 陈曦. 哀牢山中山湿性常绿阔叶林两种优势幼苗C、N、P化学计量特征及其对N沉降增加的响应. 植物生态学报, 2015, 39(10): 962-970. DOI: 10.17521/cjpe.2015.0093

SHI Xian-Meng,QI Jin-Hua,SONG Liang,LIU Wen-Yao,HUANG Jun-Biao,LI Su,LU Hua-Zheng,CHEN Xi. C, N and P stoichiometry of two dominant seedlings and their responses to nitrogen additions in the montane moist evergreen broad-leaved forest in Ailao Mountains, Yunnan. Chinese Journal of Plant Ecology, 2015, 39(10): 962-970. DOI: 10.17521/cjpe.2015.0093

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2015.0093

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图/表 7

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物种 Species	器官 Organ	C (mg·g^-1)	N (mg·g^-1)	P (mg·g^-1)	C:N	N:P	C:P
黄心树	根 Root	469.00 ± 1.78^Aa	6.86 ± 0.30^Aa	0.55 ± 0.02^Aa	12.59 ± 0.36^Aa	68.81 ± 3.01^Aa	864.61 ± 32.76^Aa
Machilus gamblei	茎 Stem	469.50 ± 0.29^Aa	7.26 ± 0.24^Aa	0.58 ± 0.02^Aa	12.57 ± 0.22^Aa	64.90 ± 2.14^Ab	815.18 ± 24.79^Aa
	叶 Leaf	494.50 ± 0.96^Ba	14.70 ± 0.13^Ba	0.90 ± 0.01^Ba	16.30 ± 0.11^Ba	33.64 ± 0.33^Bb	548.29 ± 8.47^Ba
多花山矾	根 Root	418.00 ± 0.91^Ab	6.53 ± 0.48^Aa	0.91 ± 0.11^Ab	7.72 ± 1.60^Ab	65.03 ± 4.46^Aa	483.21 ± 63.89^Ab
Symplocos ramosissima	茎 Stem	411.75 ± 4.01^Ab	8.45 ± 0.41^Bb	0.95 ± 0.09^Ab	9.30 ± 1.40^Aa	49.06 ± 2.33^Bb	450.87 ± 56.89^Ab
	叶 Leaf	402.50 ± 1.26^Bb	18.93 ± 0.18^Cb	1.14 ± 0.03^Ab	16.61 ± 0.53^Ba	21.27 ± 0.16^Cb	353.23 ± 10.46^Ab

物种 Species	器官 Organ	C (mg·g^-1)	N (mg·g^-1)	P (mg·g^-1)	C:N	N:P	C:P
黄心树	根 Root	469.00 ± 1.78^Aa	6.86 ± 0.30^Aa	0.55 ± 0.02^Aa	12.59 ± 0.36^Aa	68.81 ± 3.01^Aa	864.61 ± 32.76^Aa
Machilus gamblei	茎 Stem	469.50 ± 0.29^Aa	7.26 ± 0.24^Aa	0.58 ± 0.02^Aa	12.57 ± 0.22^Aa	64.90 ± 2.14^Ab	815.18 ± 24.79^Aa
	叶 Leaf	494.50 ± 0.96^Ba	14.70 ± 0.13^Ba	0.90 ± 0.01^Ba	16.30 ± 0.11^Ba	33.64 ± 0.33^Bb	548.29 ± 8.47^Ba
多花山矾	根 Root	418.00 ± 0.91^Ab	6.53 ± 0.48^Aa	0.91 ± 0.11^Ab	7.72 ± 1.60^Ab	65.03 ± 4.46^Aa	483.21 ± 63.89^Ab
Symplocos ramosissima	茎 Stem	411.75 ± 4.01^Ab	8.45 ± 0.41^Bb	0.95 ± 0.09^Ab	9.30 ± 1.40^Aa	49.06 ± 2.33^Bb	450.87 ± 56.89^Ab
	叶 Leaf	402.50 ± 1.26^Bb	18.93 ± 0.18^Cb	1.14 ± 0.03^Ab	16.61 ± 0.53^Ba	21.27 ± 0.16^Cb	353.23 ± 10.46^Ab

变量 Variables	N处理 N treatments (T)	物种 Species (S)	器官 Organs (O)	T × S	T × O	S × O	T × S × O
C	14.780^***	3 557.641^***	13.556^***	17.935^***	1.358	168.786^***	1.602
N	26.605^***	99.505^***	2 263.338^***	1.382	3.723^**	115.645^***	4.176^**
P	27.124^***	12.711^**	286.908^***	41.785^***	2.683^*	2.667	3.192^**
C:N	7.628^***	52.952^***	549.602^***	5.664^**	0.945	13.603^***	1.396
N:P	46.896^***	17.641^***	160.241^***	21.991^***	1.719	12.343^***	0.879
C:P	19.440^***	30.180^***	230.617^***	38.165^***	4.137^**	3.636^*	5.831^***

变量 Variables	N处理 N treatments (T)	物种 Species (S)	器官 Organs (O)	T × S	T × O	S × O	T × S × O
C	14.780^***	3 557.641^***	13.556^***	17.935^***	1.358	168.786^***	1.602
N	26.605^***	99.505^***	2 263.338^***	1.382	3.723^**	115.645^***	4.176^**
P	27.124^***	12.711^**	286.908^***	41.785^***	2.683^*	2.667	3.192^**
C:N	7.628^***	52.952^***	549.602^***	5.664^**	0.945	13.603^***	1.396
N:P	46.896^***	17.641^***	160.241^***	21.991^***	1.719	12.343^***	0.879
C:P	19.440^***	30.180^***	230.617^***	38.165^***	4.137^**	3.636^*	5.831^***

土壤无机N Soil inorganic N	对照组 Control (T₀)	低N处理组 Low N treatment (T₁)	中N处理组 Medium N treatment (T₂)	高N处理组 High N treatment (T₃)
NH₄⁺-N (mg·kg^-1)	43.22 ± 6.77	60.62 ± 3.97	64.90 ± 4.82	67.91 ± 2.19
NO₃^–-N (mg·kg^-1)	4.11 ± 1.19	4.54 ± 2.04	2.96 ± 1.14	4.71 ± 1.28

哀牢山中山湿性常绿阔叶林两种优势幼苗C、N、P化学计量特征及其对N沉降增加的响应

C, N and P stoichiometry of two dominant seedlings and their responses to nitrogen additions in the montane moist evergreen broad-leaved forest in Ailao Mountains, Yunnan

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器官 Organ	土壤N含量 Soil N concentration
器官 Organ	黄心树 Machilus gamblei	多花山矾 Symplocos ramosissima
根 Root	0.817^***	0.753^**
茎 Stem	0.699^**	0.469
叶 Leaf	0.851^***	0.698^**

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