大气CO2浓度升高和N沉降对南亚热带主要乡土树种叶片元素含量的影响

doi:10.3724/SP.J.1258.2012.00447

摘要/Abstract

摘要：

大气CO₂浓度升高和N沉降以及二者之间的耦合作用对陆地森林生态系统的影响是当前国际生态学界关注的热点之一。该实验运用大型开顶箱(open-top chamber, OTC)研究: 1)高CO₂浓度(700 µmol×mol^-1) +高N沉降(100 kg N×hm^-2×a^-1) (CN); 2)高CO₂浓度(700 µmol×mol^-1)和背景N沉降(CC); 3)高N沉降(100 kg N×hm^-2×a^-1)和背景CO₂浓度(NN); 4)背景CO₂和背景N沉降(CK) 4种处理对南亚热带主要乡土树种木荷(Schima superba)、红锥(Castanopsis hystrix)、肖蒲桃(Acmena acuminatissima)、红鳞蒲桃(Syzygium hancei)、海南红豆(Ormosia pinnata)叶片元素含量的影响。研究结果表明, 大气CO₂浓度升高对5种乡土树种叶片元素含量有较大的影响, 除海南红豆叶片的Ca含量外, 其他树种的叶片元素含量在高CO₂浓度处理下都显著升高(p < 0.05); 而在N沉降处理下, 5个树种的叶片K和Ca含量都降低。大气CO₂浓度升高与N沉降处理对5种乡土树种植物叶片元素含量影响的交互作用不是很明显, 仅仅木荷和红鳞蒲桃的叶片Ca和Mn以及海南红豆的叶片Mn含量在大气CO₂浓度上升和N沉降交互处理下显著下降, 而肖蒲桃的叶片P含量在大气CO₂浓度上升和N沉降交互处理下显著上升。

关键词: 元素含量, CO₂浓度升高, N沉降, 乡土树种

Abstract:

Aims The effects of elevated atmospheric CO₂ concentration and N deposition on terrestrial ecosystems and plants are the focus of international ecological study. Changes of nutrient element content in plants induced by atmospheric CO₂ concentration and/or N deposition directly affect the productivity of forest ecosystems; however, few studies have examined this in subtropical China. Our purpose is to study the effects of elevated CO₂ and N deposition on leaf element contents of major native tree species in southern subtropical China.
Methods Five tree species native in southern China were planted in model forest ecosystems. The species were exposed to elevated CO₂ and N deposition in open top chambers in May 2005. The four treatments are: CN (elevated CO₂ and high N deposition), CC (elevated CO₂ and ambient N deposition), NN (high N deposition and ambient CO₂) and CK (ambient CO₂ and ambient N deposition). The elevated CO₂ was (700 ± 20) µmol·mol^-1, and the total amount of added NH₄NO₃-N was 100 kg N·hm^-2·a^-1. Leaves were harvested in January 2009, and elements in the leaves were measured.
Important findings Compared to the control, elevated CO₂ concentration significantly increased leaf-element contents in all species (p < 0.05) except for Ca content in Ormosia pinnata. High N deposition decreased K and Ca contents in the species. There was no interactive effect of high CO₂ concentration and N deposition treatments on most leaf element contents. The interactive effect of high CO₂ concentration and N deposition treatments only decreased leaf Ca contents in Schima superba and Syzygium hancei and leaf Mn contents in Schima superba, Syzygium hancei and Ormosia pinnata, as well as increased leaf P content in trees of Acmena acuminatissima.

Key words: element content, elevated CO₂concentration, N deposition, native tree species

李义勇, 黄文娟, 赵亮, 方熊, 刘菊秀. 大气CO₂浓度升高和N沉降对南亚热带主要乡土树种叶片元素含量的影响. 植物生态学报, 2012, 36(5): 447-455. DOI: 10.3724/SP.J.1258.2012.00447

LI Yi-Yong, HUANG Wen-Juan, ZHAO Liang, FANG Xiong, LIU Ju-Xiu. Effects of elevated CO₂ concentration and N deposition on leaf element contents of major native tree species in southern subtropical China. Chinese Journal of Plant Ecology, 2012, 36(5): 447-455. DOI: 10.3724/SP.J.1258.2012.00447

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2012.00447

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参考文献 39

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土壤深度 Soil depth (cm)	pH	K (g·kg^-1)	Na (g·kg^-1)	Ca (g·kg^-1)	Mg (g·kg^-1)	Cu (mg·kg^-1)	Mn (mg·kg^-1)	Zn (mg·kg^-1)	Al (mg·kg^-1)	Pb (mg·kg^-1)	P (g·kg^-1)
0-20	4.15	6.30	0.64	1.03	1.03	4.69	78.70	35.91	1.77	37.48	0.30
0-20	(0.15)	(0.73)	(0.19)	(0.22)	(0.13)	(1.75)	(8.78)	(17.16)	(0.63)	(7.07)	(0.09)
20-40	4.27	5.03	0.63	0.57	0.84	4.68	73.68	30.15	1.55	23.04	0.18
20-40	(0.15)	(1.11)	(0.49)	(0.27)	(0.22)	(1.50)	(25.00)	(14.35)	(0.15)	(6.42)	(0.19)
40-60	4.25	5.49	1.35	0.51	0.83	5.91	65.15	48.02	1.32	19.76	0.14
40-60	(0.13)	(1.53)	(0.63)	(0.18)	(0.23)	(3.60)	(16.96)	(79.07)	(0.19)	(6.61)	(0.07)

土壤深度 Soil depth (cm)	pH	K (g·kg^-1)	Na (g·kg^-1)	Ca (g·kg^-1)	Mg (g·kg^-1)	Cu (mg·kg^-1)	Mn (mg·kg^-1)	Zn (mg·kg^-1)	Al (mg·kg^-1)	Pb (mg·kg^-1)	P (g·kg^-1)
0-20	4.15	6.30	0.64	1.03	1.03	4.69	78.70	35.91	1.77	37.48	0.30
0-20	(0.15)	(0.73)	(0.19)	(0.22)	(0.13)	(1.75)	(8.78)	(17.16)	(0.63)	(7.07)	(0.09)
20-40	4.27	5.03	0.63	0.57	0.84	4.68	73.68	30.15	1.55	23.04	0.18
20-40	(0.15)	(1.11)	(0.49)	(0.27)	(0.22)	(1.50)	(25.00)	(14.35)	(0.15)	(6.42)	(0.19)
40-60	4.25	5.49	1.35	0.51	0.83	5.91	65.15	48.02	1.32	19.76	0.14
40-60	(0.13)	(1.53)	(0.63)	(0.18)	(0.23)	(3.60)	(16.96)	(79.07)	(0.19)	(6.61)	(0.07)

植物 Species	K (g·kg^-1)	Na (g·kg^-1)	Ca (g·kg^-1)	Mg (g·kg^-1)	Cu (mg·kg^-1)	Mn (mg·kg^-1)	Zn (mg·kg^-1)	Al (mg·kg^-1)	Pb (mg·kg^-1)	P (g·kg^-1)
木荷	5.46	1.98	6.81	0.96	4.04	1334.43	29.49	1.89	89.29	0.71
Schima superba	(0.15)	(0.06)	(0.36)	(0.03)	(0.78)	(27.93)	(3.14)	(0.01)	(0.87)	(0.02)
红锥	5.43	2.09	6.55	1.23	4.34	621.86	41.95	1.50	101.12	1.29
Castanopsis hystrix	(0.53)	(0.11)	(0.65)	(0.09)	(0.39)	(53.05)	(6.94)	(0.07)	(17.48)	(0.13)
肖蒲桃	10.51	1.26	7.73	1.32	3.45	36.66	32.69	1.18	44.13	1.29
Acmena acuminatissima	(0.94)	(0.11)	(2.02)	(0.09)	(0.03)	(0.29)	(2.23)	(0.09)	(13.04)	(0.11)
红鳞蒲桃	8.24	0.61	9.42	1.42	5.68	859.61	31.82	1.00	25.94	0.56
Syzygium hancei	(0.56)	(0.05)	(5.83)	(0.14)	(0.63)	(95.30)	(7.99)	(0.00)	(19.03)	(0.02)
海南红豆	7.58	0.56	4.29	0.81	4.56	256.29	28.60	0.96	45.75	1.02
Ormosia pinnata	(0.60)	(0.05)	(0.34)	(0.09)	(0.52)	(19.18)	(3.02)	(0.06)	(12.45)	(0.10)

植物 Species	K (g·kg^-1)	Na (g·kg^-1)	Ca (g·kg^-1)	Mg (g·kg^-1)	Cu (mg·kg^-1)	Mn (mg·kg^-1)	Zn (mg·kg^-1)	Al (mg·kg^-1)	Pb (mg·kg^-1)	P (g·kg^-1)
木荷	5.46	1.98	6.81	0.96	4.04	1334.43	29.49	1.89	89.29	0.71
Schima superba	(0.15)	(0.06)	(0.36)	(0.03)	(0.78)	(27.93)	(3.14)	(0.01)	(0.87)	(0.02)
红锥	5.43	2.09	6.55	1.23	4.34	621.86	41.95	1.50	101.12	1.29
Castanopsis hystrix	(0.53)	(0.11)	(0.65)	(0.09)	(0.39)	(53.05)	(6.94)	(0.07)	(17.48)	(0.13)
肖蒲桃	10.51	1.26	7.73	1.32	3.45	36.66	32.69	1.18	44.13	1.29
Acmena acuminatissima	(0.94)	(0.11)	(2.02)	(0.09)	(0.03)	(0.29)	(2.23)	(0.09)	(13.04)	(0.11)
红鳞蒲桃	8.24	0.61	9.42	1.42	5.68	859.61	31.82	1.00	25.94	0.56
Syzygium hancei	(0.56)	(0.05)	(5.83)	(0.14)	(0.63)	(95.30)	(7.99)	(0.00)	(19.03)	(0.02)
海南红豆	7.58	0.56	4.29	0.81	4.56	256.29	28.60	0.96	45.75	1.02
Ormosia pinnata	(0.60)	(0.05)	(0.34)	(0.09)	(0.52)	(19.18)	(3.02)	(0.06)	(12.45)	(0.10)

	处理 Treatment	K	Na	Ca	Mg	Cu	Mn	Zn	Al	Pb	P
木荷	C	NS	NS	NS	NS	NS	0.005	NS	NS	NS	NS
Schima superba	N	0.008	0.014	NS	0.038	NS	0.000	NS	NS	NS	NS
	C × N	NS	NS	0.016	NS	NS	0.008	NS	NS	NS	NS
红锥	C	0.001	NS	0.010	0.006	0.044	0.000	0.015	NS	0.003	NS
Castanopsis hystrix	N	0.001	0.019	NS	NS	NS	NS	NS	NS	NS	NS
	C × N	NS	NS	NS	NS	NS	NS	NS	NS	NS	NS
肖蒲桃	C	NS	0.007	NS	NS	NS	0.010	NS	0.030	NS	0.000
Acmena acuminatissima	N	NS	0.003	NS	NS	NS	0.008	NS	0.049	NS	0.000
	C × N	NS	NS	NS	NS	NS	NS	NS	NS	NS	0.004
红鳞蒲桃	C	0.004	0.000	NS	0.000	0.016	0.001	0.046	0.003	0.001	0.008
Syzygium hancei	N	NS	0.054	0.005	0.003	NS	NS	NS	NS	NS	NS
	C × N	NS	NS	0.020	0.031	NS	0.002	NS	NS	NS	NS
海南红豆	C	0.009	NS	0.005	NS	NS	0.023	NS	NS	0.060	0.011
Ormosia pinnata	N	0.002	NS	NS	NS	NS	NS	NS	NS	0.008	NS
	C × N	NS	NS	NS	NS	NS	0.029	NS	NS	NS	NS

大气CO₂浓度升高和N沉降对南亚热带主要乡土树种叶片元素含量的影响

Effects of elevated CO₂ concentration and N deposition on leaf element contents of major native tree species in southern subtropical China

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