Arid
DOI10.1111/jvs.12282
Responses of two contrasting saline-alkaline grassland communities to nitrogen addition during early secondary succession
Bai, Zhenjian1; Gao, Ying1; Xing, Fu1; Sun, Shengnan1; Jiao, Deyu2; Wei, Xiuhong3; Mu, Chunsheng1
通讯作者Xing, Fu
来源期刊JOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
EISSN1654-1103
出版年2015
卷号26期号:4页码:686-696
英文摘要

Question(1) How do secondary successional dynamics differ in high and low saline-alkaline grassland communities in semi-arid lands; and (2) does nitrogen (N) enrichment promote plant secondary succession towards a perennial community under saline-alkaline stress?


LocationSaline-alkaline grassland in northeast China.


MethodsWe selected two early successional communities differing in soil saline-alkaline stress and floristic composition: one high-stress community’ co-dominated by the annual grass Chloris virgata and the annual forbs Artemisia scoparia and Kochia sieversiana, and one low-stress community’ dominated by the annual forb K.sieversiana. A complete randomized design experiment with five N addition levels was conducted in triplicate for four consecutive years (2008-2011). The vegetation variables (above-ground biomass of individual species, functional group, community level, community species richness) and soil characteristics (pH, electrical conductivity as a proxy for salinity) were investigated every year. Detrended correspondence analysis (DCA) was used to evaluate the successional trajectories.


ResultsDCA revealed clear differences in species composition and successional trajectories between the two communities. There were few changes in the species composition of the high-stress community, with annual species dominating all the plots over the 4yr. However, most of the low-stress communities developed from the annual-dominated stage to the perennial-dominated stage. N addition had no effect on the relative biomass of the perennial functional group in the two communities. Thus, N addition did not obviously promote plant succession towards a perennial community, even under low saline-alkaline stress. Species richness did not respond to N addition in the high-stress community, whereas species richness declined across the N addition gradient in the low-stress community.


ConclusionOur results provided direct empirical evidence that high saline-alkaline stress limits plant community succession, and low saline-alkaline stress communities exhibit a succession direction from the annual-dominated stage to the perennial-dominated stage. Interestingly, replicates within the same treatment under low-stress conditions did not develop towards a similar community composition, indicating the importance of environment heterogeneity at a small spatial scale. N addition did not promote the expected perennial plant succession; however, N enrichment reduced plant diversity and enhanced above-ground biomass, suggesting that artificial N addition (e.g. N deposition) may have an important effect in our system.


英文关键词Competitive exclusion Functional group N deposition Plant diversity Salinity-alkalinity Successional dynamics
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000356811300009
WOS关键词SEMIARID SAGEBRUSH SITE ; SPECIES-DIVERSITY ; PLANT-COMMUNITIES ; OLD-FIELDS ; DYNAMICS ; CHINA ; COMPETITION ; DEPOSITION ; NUTRIENTS ; LIGHT
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/189035
作者单位1.NE Normal Univ, Inst Grassland Sci, Key Lab Vegetat Ecol, Minist Educ, Changchun 130024, Jilin, Peoples R China;
2.Water Conservancy Dev Stn, Tumuji Town 137628, Inner Mongolia, Peoples R China;
3.Management Bur Natl Nat Reserve, Tumuji Town 137600, Inner Mongolia, Peoples R China
推荐引用方式
GB/T 7714
Bai, Zhenjian,Gao, Ying,Xing, Fu,et al. Responses of two contrasting saline-alkaline grassland communities to nitrogen addition during early secondary succession[J],2015,26(4):686-696.
APA Bai, Zhenjian.,Gao, Ying.,Xing, Fu.,Sun, Shengnan.,Jiao, Deyu.,...&Mu, Chunsheng.(2015).Responses of two contrasting saline-alkaline grassland communities to nitrogen addition during early secondary succession.JOURNAL OF VEGETATION SCIENCE,26(4),686-696.
MLA Bai, Zhenjian,et al."Responses of two contrasting saline-alkaline grassland communities to nitrogen addition during early secondary succession".JOURNAL OF VEGETATION SCIENCE 26.4(2015):686-696.
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