Phosphorus addition enhances loss of nitrogen in a phosphorus-poor soil (EI)

CORC > 寒区旱区环境与工程研究所 > 中科院寒区旱区环境与工程研究所（未分类） > 期刊论文

	Phosphorus addition enhances loss of nitrogen in a phosphorus-poor soil (EI)
	He M.; Dijkstra F. A.
刊名	Soil Biology and Biochemistry
	2015
卷号	82 页码:99-106
英文摘要	Plants and microbes have limited stoichiometric flexibility to take up and store nitrogen (N) and phosphorus (P). Variation in the relative availability of N and P to plants and microbes may therefore affect how strongly N and P are held in terrestrial ecosystems with important implications for net primary productivity and carbon sequestration. We hypothesized that an increase in P availability in a P-poor soil would increase N uptake by plants and microbes thereby reducing N loss. We grew mixtures of the C3 grass Phalaris aquatica L. and the legume Medicago sativa L. in mesocosms with soils low in P availability and then used a novel technique by adding a 15N tracer with and without 1gPm-2 to soil with different moisture and available N conditions, and measured the 15N recovery after 48h in microbes, plants and soil. In contrast to our hypothesis, we found that P addition reduced 15N in microbes without water stress by 80% and also reduced total15N recovery, particularly without water stress. Water stress in combination with N addition further showed low total 15N recovery, possibly because of reduced plant uptake thereby leaving more 15N in the soil available for nitrification and denitrification. Our results suggest that P addition can result in large gaseous N loss in P-poor soils, most likely by directly stimulating nitrification and denitrification.
收录类别	EI
语种	英语
内容类型	期刊论文
源URL	[http://ir.casnw.net/handle/362004/27197]
专题	寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文
推荐引用方式 GB/T 7714	He M.,Dijkstra F. A.. Phosphorus addition enhances loss of nitrogen in a phosphorus-poor soil (EI)[J]. Soil Biology and Biochemistry,2015,82:99-106.
APA	He M.,&Dijkstra F. A..(2015).Phosphorus addition enhances loss of nitrogen in a phosphorus-poor soil (EI).Soil Biology and Biochemistry,82,99-106.
MLA	He M.,et al."Phosphorus addition enhances loss of nitrogen in a phosphorus-poor soil (EI)".Soil Biology and Biochemistry 82(2015):99-106.