内蒙古大针茅草原常见植物在不同土地利用方式下的固碳相关属性

doi:10.3724/SP.J.1258.2014.00077

摘要/Abstract

摘要：

为了探究植物与固碳相关属性在不同功能群、器官和物种间的差异, 以及这些属性对不同土地利用方式的响应, 2012年8月对内蒙古大针茅草原的4个样地(长期无干扰样地、长期自由放牧样地、4年围封样地和4年围封割草样地)进行了群落调查, 并采集样地中的常见植物, 测定了与植物固碳相关的属性, 包括全碳含量、全氮含量、碳氮比、纤维素含量、木质素含量和酸性洗涤纤维含量等。以常见植物为对象, 在功能群水平研究了各土地利用方式下全碳含量、全氮含量和碳氮比的差异; 针对各样地的共有种——糙隐子草(Cleistogenes squarrosa)、大针茅(Stipa grandis)、冷蒿(Artemisia frigida)、羊草(Leymus chinensis)和猪毛菜(Salsola collina), 从物种和器官水平分析了不同土地利用方式下植物的固碳相关属性。结果表明: 大针茅草原植物不同功能群、物种和器官间的固碳相关属性存在极显著差异, 不同土地利用方式下大针茅草原不同功能型、物种和器官的固碳相关属性有显著差异。与其他利用方式相比, 4年围封割草对植物与固碳相关属性的影响最为明显, 功能群、器官和物种水平的植物氮含量均有下降。糙隐子草和猪毛菜的这些属性对长期自由放牧的响应敏感, 且方向相反。

关键词: 纤维素, 碳氮比, 围封, 放牧, 割草, 木质素, 植物功能属性

Abstract:

Aims Land-use change is one of the key factors affecting global carbon cycle, and plant functional traits have been widely used to study the linkage between environmental factors and ecosystem functioning. With the help of plant functional traits, we can better understand how plants respond to land-use changes. This study aims to 1) determine how plant traits related to carbon sequestration differ among different functional groups, organs and species of common plants in a Stipa grandis steppe in Nei Mongol; 2) explore the underlying impacts of four different land-use types on traits related to carbon sequestration of the studied plants.
Methods The study was conducted in Maodeng pastureland, Xilinhot, Nei Mongol. Samples of common plant species were collected in four plots, including a long-term reserved plot, a long-term free grazing plot, a 4-year enclosed plot and a 4-year enclosed plot with hay harvesting. We separated the plants into organs and determined the contents of carbon, total nitrogen, cellulose, lignin and acid detergent fiber, and then calculated the ratio of carbon to nitrogen. All data were analyzed in IBM SPSS Statistics for Windows 19.0.
Important findings There were marked differences in the traits related to carbon sequestration among different plant functional groups, species and organs. Land-uses significantly affected these traits at the three organizational levels. Four-year enclosure with hay harvesting resulted in a decrease in nitrogen content of the plants compared with other three land-use types. Both Cleistogenes squarrosa and Salsola collina were susceptible in the traits related to carbon sequestration to long-term free grazing, but their patterns of responses were reversed.

Key words: cellulose, C:N, enclosed, grazing, hay harvesting, lignin, plant functional traits

陈慧颖, 张景慧, 黄永梅, 龚吉蕊. 内蒙古大针茅草原常见植物在不同土地利用方式下的固碳相关属性. 植物生态学报, 2014, 38(8): 821-832. DOI: 10.3724/SP.J.1258.2014.00077

CHEN Hui-Ying, ZHANG Jing-Hui, HUANG Yong-Mei, GONG Ji-Rui. Traits related to carbon sequestration of common plant species in a Stipa grandis steppe in Nei Mongol under different land-uses. Chinese Journal of Plant Ecology, 2014, 38(8): 821-832. DOI: 10.3724/SP.J.1258.2014.00077

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https://www.plant-ecology.com/CN/Y2014/V38/I8/821

图/表 9

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样地类型 Plot type	平均高度 Average height (cm)	平均盖度 Average coverage (%)	群落地上生物量 Aboveground biomass of community (g·m^-2)
Y1	18.57 ± 0.81	72.27 ± 2.97	144.86 ± 11.06
Y2	20.25 ± 0.90	80.90 ± 2.27	171.48 ± 15.86
Y3	22.53 ± 0.92	72.66 ± 3.02	183.28 ± 13.76
Y4	22.58 ± 1.94	73.83 ± 3.17	176.69 ± 20.32

样地类型 Plot type	平均高度 Average height (cm)	平均盖度 Average coverage (%)	群落地上生物量 Aboveground biomass of community (g·m^-2)
Y1	18.57 ± 0.81	72.27 ± 2.97	144.86 ± 11.06
Y2	20.25 ± 0.90	80.90 ± 2.27	171.48 ± 15.86
Y3	22.53 ± 0.92	72.66 ± 3.02	183.28 ± 13.76
Y4	22.58 ± 1.94	73.83 ± 3.17	176.69 ± 20.32

植物功能群 Plant functional group	物种 Species	科 Family	光合途径 Photosynthetic pathway	采样地 Sampling plot
一年生草本 Annual herb	刺藜 Chenopodium aristatum	藜科 Chenopodiaceae	C₄	Y1, Y2, Y3, Y4
	藜 Chenopodium album	藜科 Chenopodiaceae	C₄	Y2, Y3, Y4
	猪毛菜 Salsola collina	藜科 Chenopodiaceae	C₄	Y1, Y2, Y3, Y4
多年生根茎禾草 Perennial rhizome grass	冰草 Agropyron cristatum	禾本科 Poaceae	C₃	Y2, Y3, Y4
多年生根茎禾草 Perennial rhizome grass	羊草 Leymus chinensis	禾本科 Poaceae	C₃	Y1, Y2, Y3, Y4
多年生丛生禾草 Perennial bunchgrass	糙隐子草 Cleistogenes squarrosa	禾本科 Poaceae	C₄	Y1, Y2, Y3, Y4
多年生丛生禾草 Perennial bunchgrass	大针茅 Stipa grandis	禾本科 Poaceae	C₃	Y1, Y2, Y3, Y4
多年生杂类草 Perennial forb	瓣蕊唐松草 Thalictrum petaloideum	毛茛科 Ranunculaceae	C₃	Y4
	碱韭 Allium polyrhizum	百合科 Liliaceae	C₃	Y1, Y3, Y4
	麻花头 Serratula centauroides	菊科 Asteraceae	C₃	Y2, Y3, Y4
	细叶韭 Allium tenuissimum	百合科 Liliaceae	C₃	Y1, Y2, Y3, Y4
	银灰旋花 Convolvulus ammannii	旋花科 Convolvulaceae	C₃	Y1
	知母 Anemarrhena asphodeloides	百合科 Liliaceae	C₃	Y1
	冷蒿 Artemisia frigida	菊科 Asteraceae	C₃	Y1, Y2, Y3, Y4

植物功能群 Plant functional group	物种 Species	科 Family	光合途径 Photosynthetic pathway	采样地 Sampling plot
一年生草本 Annual herb	刺藜 Chenopodium aristatum	藜科 Chenopodiaceae	C₄	Y1, Y2, Y3, Y4
	藜 Chenopodium album	藜科 Chenopodiaceae	C₄	Y2, Y3, Y4
	猪毛菜 Salsola collina	藜科 Chenopodiaceae	C₄	Y1, Y2, Y3, Y4
多年生根茎禾草 Perennial rhizome grass	冰草 Agropyron cristatum	禾本科 Poaceae	C₃	Y2, Y3, Y4
多年生根茎禾草 Perennial rhizome grass	羊草 Leymus chinensis	禾本科 Poaceae	C₃	Y1, Y2, Y3, Y4
多年生丛生禾草 Perennial bunchgrass	糙隐子草 Cleistogenes squarrosa	禾本科 Poaceae	C₄	Y1, Y2, Y3, Y4
多年生丛生禾草 Perennial bunchgrass	大针茅 Stipa grandis	禾本科 Poaceae	C₃	Y1, Y2, Y3, Y4
多年生杂类草 Perennial forb	瓣蕊唐松草 Thalictrum petaloideum	毛茛科 Ranunculaceae	C₃	Y4
	碱韭 Allium polyrhizum	百合科 Liliaceae	C₃	Y1, Y3, Y4
	麻花头 Serratula centauroides	菊科 Asteraceae	C₃	Y2, Y3, Y4
	细叶韭 Allium tenuissimum	百合科 Liliaceae	C₃	Y1, Y2, Y3, Y4
	银灰旋花 Convolvulus ammannii	旋花科 Convolvulaceae	C₃	Y1
	知母 Anemarrhena asphodeloides	百合科 Liliaceae	C₃	Y1
	冷蒿 Artemisia frigida	菊科 Asteraceae	C₃	Y1, Y2, Y3, Y4

固碳相关属性 Traits related to carbon sequestration	土地利用方式 Land-use type			植物功能群 Plant functional group			交互作用 Interactions
	df	F	p	df	F	p	df	F	p
全碳含量 Total carbon content (%)	3	5.744	0.001	3	21.312	<0.001	9	2.216	0.025
全氮含量 Total nitrogen content (%)	3	5.263	0.002	3	26.820	<0.001	9	4.447	<0.001
碳氮比 C:N	3	2.439	0.068	3	15.467	<0.001	9	3.146	0.002