Topographic Influence on Plant Nitrogen and Phosphorus Stoichiometry in a Temperate Forested Watershed

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• 作者：Masaaki Chiwa ; Shoko Ikezaki ; Ayumi Katayama ; Tsutomu Enoki
• 关键词：P limitation ; N saturation ; Topography ; Atmospheric N deposition ; Stoichiometry ; Serpentine bedrock
• 刊名：Water, Air, and Soil Pollution
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：227
• 期：1
• 全文大小：1,220 KB
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• 作者单位：Masaaki Chiwa (1)
  Shoko Ikezaki (1)
  Ayumi Katayama (1)
  Tsutomu Enoki (1)
  
  1. Kyushu University Forest, Kyushu University, 394 Tsubakuro, Sasaguri, 811-2415, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Terrestrial Pollution
  Hydrogeology
  
• 出版者：Springer Netherlands
• ISSN：1573-2932

文摘

Plant stoichiometry has been used to diagnose phosphorus (P) limitation caused by increased atmospheric nitrogen (N) deposition. Spatial variability of N/P stoichiometry within a forested watershed has not yet been evaluated. This study conducted synoptic sampling of leaf matter in 27 plots within a temperate forested watershed on low P availability rock (serpentine bedrock) with a moderately high atmospheric N deposition (16 kg N ha鈭? year鈭?) to assess the effects of spatial topographic variation on N/P stoichiometry. Leaf N and P concentrations and N/P ratios of Japanese cypress were assessed, and their spatial variations were evaluated across a catchment. Average leaf P concentration was low (0.66鈥壜扁€?.16 mg g鈭?) across the sites, while leaf N concentration was high (13.0鈥壜扁€?.5 mg g鈭?); subsequently, N/P ratios were high (21鈥壜扁€?). In addition, the aboveground biomass growth of Japanese cypress positively correlated with litter P, implying the P limitation of Japanese cypress at the study site. Leaf P concentrations responded to the index of convexity (IC) values more than those of N. Subsequently, the N/P ratio correlated with IC, suggesting that N/P ratios are susceptible to topographic features. This could be partly caused by smaller spatial variability of N availability compared with P, owing to increased atmospheric N deposition. Thus, topography should be taken into consideration when diagnosing P limitation caused by N deposition. Keywords P limitation N saturation Topography Atmospheric N deposition Stoichiometry Serpentine bedrock