Articles | Volume 7, issue 6
Solid Earth, 7, 1565–1575, 2016
Solid Earth, 7, 1565–1575, 2016

Research article 23 Nov 2016

Research article | 23 Nov 2016

Nitrogen addition alters elemental stoichiometry within soil aggregates in a temperate steppe

Jinfei Yin1,2, Ruzhen Wang1, Heyong Liu1, Xue Feng1, Zhuwen Xu1, and Yong Jiang1 Jinfei Yin et al.
  • 1State Engineering Laboratory of Soil Nutrient Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Ongoing increases in anthropogenic nitrogen (N) inputs have largely affected soil carbon (C) and nutrient cycling in most terrestrial ecosystems. Numerous studies have concerned the effects of elevated N inputs on soil dissolved organic carbon (DOC), dissolved inorganic N (DIN), available phosphorus (AP), exchangeable calcium (Ca) and magnesium (Mg), and available iron (Fe) and manganese (Mn). However, few have emphasized the stoichiometric traits of these soil parameters, especially within different soil aggregate fractions. In a semiarid grassland of Inner Mongolia, we studied the effect of N addition on the ratios of DOC : DIN, DOC : AP, DIN : AP, exchangeable Ca : Mg, available Fe : Mn within three soil aggregate classes of large macroaggregates (> 2000 µm), small macroaggregates (250–2000 µm), and microaggregates (< 250 µm). Elevated N inputs significantly decreased the DOC : DIN ratio within three soil aggregates. The soil DOC : AP ratio significantly decreased along with increasing N gradients within large macroaggregates and microaggregates. Nitrogen significantly decreased the ratio of exchangeable Ca : Mg within soil macroaggregates. The ratio of available Fe : Mn decreased with N addition within three soil aggregate classes. Alteration of elemental stoichiometry within soil fractions that are characterized by different nutrient retention capacity will influence the chemical composition of soil microorganisms and plant quality.

Short summary
In this paper we report on changes in elemental stoichiometry as affected by the nitrogen addition effect within three soil aggregate fractions of large macroaggregates (> 2000 μm), small macroaggregates (250–2000 μm), and microaggregates (< 250 μm) in a temperate steppe.