Effects of nitrogen addition on ecological stoichiometric characteristics of carbon, nitrogen and phosphorus in Stipa baicalensis grassland soil aggregates

doi:10.11686/cyxb2019297

Abstract

Abstract: The influence of atmospheric nitrogen deposition on grassland ecosystems is an important component process of global climate change, and therefore has become a research hotspot in ecology. Our study aimed to understand the influence of nitrogen deposition on the carbon (C), nitrogen (N) and phosphorus (P) ecological stoichiometric characteristics of grassland soil aggregates, in order to provide fundamental research data for the comprehensive analysis and assessment of the impact of nitrogen deposition on grassland ecosystems. Since 2010, six simulated nitrogen deposition field control experiments of N₀ (0 kg N·ha^-1·yr^-1), N₁₅ (15 kg N·ha^-1·yr^-1), N₃₀ (30 kg N·ha^-1·yr^-1), N₅₀ (50 kg N·ha^-1·yr^-1), N₁₀₀ (100 kg N·ha^-1·yr^-1) and N₁₅₀ (150 kg N·ha^-1·yr^-1) were set up in an area of typical Stipa baicalensis grassland in Inner Mongolia. It was found that nitrogen addition significantly (P<0.01) increased the stability of soil aggregates and the proportion of aggregates >2 mm in diameter. In addition, the organic carbon and total nitrogen contents of 0.25-2 mm aggregates were significantly (P<0.05) higher than those of other particle sizes, but the total phosphorus contents did not differ significantly with different particle sizes. Compared with the control group, nitrogen addition significantly (P<0.05) increased the organic carbon and total nitrogen content of soil macroaggregates >0.25 mm diameter, but had no significant effect on total phosphorus. Nitrogen addition reduced the C∶N ratio of >0.25 mm aggregates, but increased C∶P and N∶P ratios of 0.25-2 mm aggregates (P<0.05). A comprehensive analysis shows that nitrogen addition promotes the carbon sequestration potential of soil to a certain degree and increases the mineralization rate of organic matter in soil aggregates. With the increase of nitrogen addition level, the elemental P level in soil aggregates becomes the main limiting factor restricting the growth of grassland plants.

Key words: soil aggregates, ecological stoichiometric characteristics, nitrogen deposition, Stipa baicalensis grassland

LI Ming, QIN Jie, HONG Yu, YANG Dian-lin, ZHOU Guang-fan, WANG Yu, WANG Li-juan. Effects of nitrogen addition on ecological stoichiometric characteristics of carbon, nitrogen and phosphorus in Stipa baicalensis grassland soil aggregates[J]. Acta Prataculturae Sinica, 2019, 28(12): 29-40.

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