Effects of Different Nitrogen Compounds Addition on Plant-soil Micronutrients in a Meadow Steppe
Atmospheric nitrogen(N) deposition has been increasing in recent decades. N addition and mowing could influence micronutrient cycling in grassland ecosystems. It remains largely unknown about how different N forms affect micronutrient status in plant-soil systems.
Recently, Prof. Yong Jiang’s Lab from the Institute of Applied Ecology of Chinese Academy of Sciences, examined the effects of different N compounds of (NH4)2SO4, NH4NO3, and urea with and without mowing on micronutrient Fe, Mn, Cu, and Zn in soil-plant systems in a meadow steppe.
They found that (NH4)2SO4 addition had a stronger negative effect on soil pH compared with NH4NO3 and urea, resulting in higher increases in soil available Fe and Mn herein. N addition decreased plant community-level Fe concentration but increased Mn concentration, with a greater effect under (NH4)2SO4 addition. Community-level Cu concentration increased with (NH4)2SO4 and NH4NO3 addition only under mowing treatment. Mowing synergistically interacted with urea addition to increase community-level Mn and Zn concentrations even with decreased soil organic matter.
The study highlights the importance of various N compounds in biogeochemical models when projecting the effects of N enrichment on grassland ecosystems.
The study entitled “Effects of nitrogen addition on plant-soil micronutrients vary with nitrogen form and mowing management in a meadow steppe” has been published online in Environmental Pollution.
This study was financially supported by the Strategic Priority Research Program of the Chinese Academy of Sciences, National Natural Science Foundation of China, and National Key Research and Development Program of China.
Institute of Applied Ecology, Chinese Academy of Sciences