Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow

NWIPB OpenIR

	Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow
	Xu, Xingliang ; Ouyang, Hua ; Cao, Guangmin ; Richter, Andreas ; Wanek, Wolfgang ; Kuzyakov, Yakov
	2011-04-01
发表期刊	PLANT AND SOIL ; Xu, XL; Ouyang, H; Cao, GM; Richter, A; Wanek, W; Kuzyakov, Y.Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow,PLANT AND SOIL,2011,341(1-2):495-504
摘要	Niche partitioning by time, space and chemical forms has been suggested as an important mechanism to maintain species coexistence. Climate warming is assumed to increase soil nutrient availability through enhancing mineralization of soil organic matter in a variety of terrestrial ecosystems. However, few studies have yet examined how dominant plant species contribute to species coexistence when nutrient enrichment occurs in native ecosystems. We studied a single fairy ring (5 m diameter) in a Kobresia meadow in the Tibetan Plateau. This kind of rings is caused by a basidiomycete fungus Agaricus campestris, and is evidenced by dark-green vegetation boundaries. Nutrient enrichment occurs due to enhanced decomposition of soil organic matter (SOM) in the fungus growth zone of these rings. We conducted a short-term (15)N labelling experiment and found that dominant plant species shifted their N uptake patterns and preferred N form (NO (3) (-) , NH (4) (+) , and amino acid N) in response to nutrient enrichment in an N-limited alpine meadow. The legume Gueldenstaedtia diversifolia had the lowest aboveground biomass among the five plant species studied at low available N level, although it mainly utilized ammonium (the most abundant N form). The two graminoids (Elymus nutans and Stipa aliena) demonstrated similar aboveground biomass at low and high available N levels, showing a similar pattern switching from NH (4) (+) /NO (3) (-) uptake outside the ring to glycine uptake in the annulus zone of the ring. The biomass of the forb Gentiana straminea differed significantly at low and high available N levels, but its N uptake pattern almost remained unchanged. Species therefore differed in their response to nutrient enrichment, most species showing chemical niche shifts instead of niche conservatism. This finding has important implications with regard to understanding the mechanisms responsible for species coexistence when natural nutrient enrichment is induced by climate warming in terrestrial ecosystems.; Niche partitioning by time, space and chemical forms has been suggested as an important mechanism to maintain species coexistence. Climate warming is assumed to increase soil nutrient availability through enhancing mineralization of soil organic matter in a variety of terrestrial ecosystems. However, few studies have yet examined how dominant plant species contribute to species coexistence when nutrient enrichment occurs in native ecosystems. We studied a single fairy ring (5 m diameter) in a Kobresia meadow in the Tibetan Plateau. This kind of rings is caused by a basidiomycete fungus Agaricus campestris, and is evidenced by dark-green vegetation boundaries. Nutrient enrichment occurs due to enhanced decomposition of soil organic matter (SOM) in the fungus growth zone of these rings. We conducted a short-term (15)N labelling experiment and found that dominant plant species shifted their N uptake patterns and preferred N form (NO (3) (-) , NH (4) (+) , and amino acid N) in response to nutrient enrichment in an N-limited alpine meadow. The legume Gueldenstaedtia diversifolia had the lowest aboveground biomass among the five plant species studied at low available N level, although it mainly utilized ammonium (the most abundant N form). The two graminoids (Elymus nutans and Stipa aliena) demonstrated similar aboveground biomass at low and high available N levels, showing a similar pattern switching from NH (4) (+) /NO (3) (-) uptake outside the ring to glycine uptake in the annulus zone of the ring. The biomass of the forb Gentiana straminea differed significantly at low and high available N levels, but its N uptake pattern almost remained unchanged. Species therefore differed in their response to nutrient enrichment, most species showing chemical niche shifts instead of niche conservatism. This finding has important implications with regard to understanding the mechanisms responsible for species coexistence when natural nutrient enrichment is induced by climate warming in terrestrial ecosystems.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/40843
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Xu, Xingliang,Ouyang, Hua,Cao, Guangmin,et al. Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow[J]. PLANT AND SOIL, Xu, XL; Ouyang, H; Cao, GM; Richter, A; Wanek, W; Kuzyakov, Y.Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow,PLANT AND SOIL,2011,341(1-2):495-504,2011.
APA	Xu, Xingliang,Ouyang, Hua,Cao, Guangmin,Richter, Andreas,Wanek, Wolfgang,&Kuzyakov, Yakov.(2011).Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow.PLANT AND SOIL.
MLA	Xu, Xingliang,et al."Dominant plant species shift their nitrogen uptake patterns in response to nutrient enrichment caused by a fungal fairy in an alpine meadow".PLANT AND SOIL (2011).