A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe
Tian, QY; Liu, NN; Bai, WM; Li, LH; Chen, JQ; Reich, PB; Yu, Q; Guo, DL; Smith, MD; Knapp, AK; Cheng, WX; Lu, P; Gao, Y; Yang, A; Wang, TZ; Li, X; Wang, ZW; Ma, YB; Han, XG; Zhang, WH
2016
Source PublicationECOLOGY
ISSN0012-9658
Volume97Issue:1Pages:65-74
AbstractLoss of plant diversity with increased anthropogenic nitrogen (N) deposition in grasslands has occurred globally. In most cases, competitive exclusion driven by preemption of light or space is invoked as a key mechanism. Here, we provide evidence from a 9-yr N-addition experiment for an alternative mechanism: differential sensitivity of forbs and grasses to increased soil manganese (Mn) levels. In Inner Mongolia steppes, increasing the N supply shifted plant community composition from grass-forb codominance (primarily Stipa krylovii and Artemisia frigida, respectively) to exclusive dominance by grass, with associated declines in overall species richness. Reduced abundance of forbs was linked to soil acidification that increased mobilization of soil Mn, with a 10-fold greater accumulation of Mn in forbs than in grasses. The enhanced accumulation of Mn in forbs was correlated with reduced photosynthetic rates and growth, and is consistent with the loss of forb species. Differential accumulation of Mn between forbs and grasses can be linked to fundamental differences between dicots and monocots in the biochemical pathways regulating metal transport. These findings provide a mechanistic explanation for N-induced species loss in temperate grasslands by linking metal mobilization in soil to differential metal acquisition and impacts on key functional groups in these ecosystems.
SubtypeJournal
KeywordArtemisia frigida forbs and grasses Inner Mongolia China manganese mobilization and acquisition nitrogen deposition photosynthesis soil acidification species richness Stipa krylovii temperate steppe
Subject AreaEnvironmental Sciences & Ecology
WOS Subject ExtendedEcology
WOS KeywordNUTRIENT ENRICHMENT ; ACIDIC GRASSLANDS ; BIODIVERSITY LOSS ; REGIONAL TRENDS ; DIVERSITY ; FERTILIZATION ; ECOSYSTEM ; CHINA ; COMPETITION ; LIGHT
Indexed BySCI
Language英语
WOS IDWOS:000369852600009
PublisherWILEY-BLACKWELL
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44313
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Tian, QY,Liu, NN,Bai, WM,et al. A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe[J]. ECOLOGY,2016,97(1):65-74.
APA Tian, QY.,Liu, NN.,Bai, WM.,Li, LH.,Chen, JQ.,...&Zhang, WH.(2016).A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe.ECOLOGY,97(1),65-74.
MLA Tian, QY,et al."A novel soil manganese mechanism drives plant species loss with increased nitrogen deposition in a temperate steppe".ECOLOGY 97.1(2016):65-74.
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