Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow

NWIPB OpenIR

	Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow
	Xu, Xingliang ; Ouyang, Hua ; Richter, Andreas ; Wanek, Wolfgang ; Cao, Guangmin ; Kuzyakov, Yakov
	2011-03-01
发表期刊	JOURNAL OF ECOLOGY ; Xu, XL; Ouyang, H; Richter, A; Wanek, W; Cao, GM; Kuzyakov, Y.Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow,JOURNAL OF ECOLOGY,2011,99(2):563-571
摘要	1. Plant microbe competition for available nitrogen (N) has been suggested to be an important mechanism controlling N limitation of plants in a variety of ecosystems. However, spatio-temporal patterns of competition between plants and microbes for soil N remain unclear. 2. Short-term (15)N tracer experiments were conducted during a growing season (July, August and September) in an alpine meadow on the Tibetan Plateau to unravel spatio-temporal patterns of plant microbe competition for NH(4)(+) and NO(3)(-). 3. Alpine plants were poorer competitors than soil microorganisms for inorganic N in July compared with August and September. Occupation of soil volume by roots and root density (high in August and September) played a greater role in plant microbe competition than air temperature or precipitation (high in July). 4. In topsoils (0-5 cm, highest root density), alpine plants effectively competed with soil microorganisms for N and showed a preference for (15)NO(3)(-), while soil microorganisms that preferentially took up (15)NH(4)(+) out-competed plants below 5 cm soil depth (lower root density). Competition between plants and soil microorganisms for inorganic N strongly depended on root density (P < 0.0001, R(2) = 0.93, exponential decay model). 5. Synthesis. Plant-microbe competition for inorganic N showed a clear spatio-temporal pattern in alpine meadows depending on (i) root density and therefore soil depth, (ii) inorganic N form, and (iii) different periods during the growing season. These findings have important implications for our understanding of above-ground below-ground interactions and plant-microbial competition for available N.; 1. Plant microbe competition for available nitrogen (N) has been suggested to be an important mechanism controlling N limitation of plants in a variety of ecosystems. However, spatio-temporal patterns of competition between plants and microbes for soil N remain unclear.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/40849
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,Richter, Andreas,et al. Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow[J]. JOURNAL OF ECOLOGY, Xu, XL; Ouyang, H; Richter, A; Wanek, W; Cao, GM; Kuzyakov, Y.Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow,JOURNAL OF ECOLOGY,2011,99(2):563-571,2011.
APA	Xu, Xingliang,Ouyang, Hua,Richter, Andreas,Wanek, Wolfgang,Cao, Guangmin,&Kuzyakov, Yakov.(2011).Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow.JOURNAL OF ECOLOGY.
MLA	Xu, Xingliang,et al."Spatio-temporal variations determine plant-microbe competition for inorganic nitrogen in an alpine meadow".JOURNAL OF ECOLOGY (2011).