干旱区生态环境知识资源中心(Arid): Alfalfa monocultures promote soil organic carbon accumulation to a greater extent than perennial grass monocultures or grass-alfalfa mixtures

Arid

DOI	10.1016/j.ecoleng.2019.03.002
	Alfalfa monocultures promote soil organic carbon accumulation to a greater extent than perennial grass monocultures or grass-alfalfa mixtures
	Li, Qiang 1,2; Zhou, Daowei 1,2; Denton, Matthew D.3; Cong, Shan 1,2,4
通讯作者	Li, Qiang
来源期刊	ECOLOGICAL ENGINEERING
ISSN	0925-8574
EISSN	1872-6992
出版年	2019
卷号	131 页码:53-62
英文摘要	Perennial forages provide a range of environmental benefits in managing water, nutrients and carbon. This study examined the changes in soil organic carbon stocks and the underlying mechanisms in mixtures and monocultures of alfalfa-Medicago sativa and perennial grass-Leymus chinensis in established grasslands in a semi-arid region. In constructed grasslands three systems (L. chinensis monocultures, L. chinensis-M. sativa mixture and M. sativa monoculture) were assessed for biological N-2 fixation (BNF), biomass accumulation and nutrient store in aboveground shoots and roots, soil total organic carbon (SOC) and labile organic carbon stocks, as well as soil nitrogen (N) and phosphorus (P) availability over four years. BNF decreased by 59% from mixtures to M. sativa monocultures due to lower legume N fixation efficiency. However, the M. sativa monocultures had greater aboveground biomass and a significantly increased root biomass compared with other treatments, through increased soil N and P acquisition. M. sativa cultivation, especially as a monoculture increased SOC stocks at the 0-150 cm soil depth compared to L. chinensis monocultures but were dependent on root biomass carbon inputs. In comparison to L. chinensis monocultures and mixtures, M. sativa monocultures significantly increased soil labile carbon [permanganate oxidizable extract] at 0-150 cm soil depth, resulting from increased root biomass carbon input. We conclude that M. sativa monocultures, rather than mixtures can promote greater SOC, and in particular the soil labile organic carbon sequestration compared to L. chinensis monoculture in short term.
英文关键词	Grass-legume mixture Lucerne Medicago sativa N-2 fixation Soil water availability Carbon sequestration Deep soil
类型	Article
语种	英语
国家	Peoples R China ; Australia
收录类别	SCI-E
WOS记录号	WOS:000465560700007
WOS关键词	LAND-USE ; MEDICAGO-TRUNCATULA ; FORAGE LAND ; NITROGEN ; SEQUESTRATION ; MATTER ; FRACTIONS ; DECOMPOSITION ; PRODUCTIVITY ; ECOSYSTEMS
WOS类目	Ecology ; Engineering, Environmental ; Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology ; Engineering
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215171
作者单位	1.Chinese Acad Sci, Northeast Inst Geog & Agroecol, 4888 Shengbei St, Changchun 130102, Jilin, Peoples R China; 2.Jilin Prov Key Lab Grassland Farming, Changchun 130102, Jilin, Peoples R China; 3.Univ Adelaide, Sch Agr Food & Wine, Adelaide, SA, Australia; 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Qiang,Zhou, Daowei,Denton, Matthew D.,et al. Alfalfa monocultures promote soil organic carbon accumulation to a greater extent than perennial grass monocultures or grass-alfalfa mixtures[J],2019,131:53-62.
APA	Li, Qiang,Zhou, Daowei,Denton, Matthew D.,&Cong, Shan.(2019).Alfalfa monocultures promote soil organic carbon accumulation to a greater extent than perennial grass monocultures or grass-alfalfa mixtures.ECOLOGICAL ENGINEERING,131,53-62.
MLA	Li, Qiang,et al."Alfalfa monocultures promote soil organic carbon accumulation to a greater extent than perennial grass monocultures or grass-alfalfa mixtures".ECOLOGICAL ENGINEERING 131(2019):53-62.