Traits related to carbon sequestration of common plant species in a Stipa grandis steppe in Nei Mongol under different land-uses

doi:10.3724/SP.J.1258.2014.00077

Abstract

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

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[J]. Chin J Plant Ecol, 2014, 38(8): 821-832.

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Figures/Tables 9

References 51

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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