Base cations and micronutrients in soil aggregates as affected by enhanced nitrogen and water inputs in a semi-arid steppe grassland

A - Papers appearing in refereed journals

Wang, R. Z., Dungait, J. A. J., Buss, H. L., Yang, S., Zhang, Y. G., Xu, Z. W. and Jiang, Y. 2017. Base cations and micronutrients in soil aggregates as affected by enhanced nitrogen and water inputs in a semi-arid steppe grassland. Science of the Total Environment. 575 (1 January), pp. 564-572. https://doi.org/10.1016/j.scitotenv.2016.09.018

AuthorsWang, R. Z., Dungait, J. A. J., Buss, H. L., Yang, S., Zhang, Y. G., Xu, Z. W. and Jiang, Y.
Abstract

The intensification of grassland management by nitrogen (N) fertilization and irrigation may threaten the future integrity of fragile semi-arid steppe ecosystems by affecting the concentrations of base cation and micronutrient in soils. We extracted base cations of exchangeable calcium (Ca), magnesium (Mg), potassium (K), and sodium (Na) and extractable micronutrients of iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn) from three soil aggregate sizes classes (microaggregates, < 0.25 mm; small macroaggregates, 0.25–2 mm; large macroaggregates, > 2 mm) from a 9-year N and water field manipulation study. There were significantly more base cations (but not micronutrients) in microaggregates compared to macroaggregates which was related to greater soil organic matter and clay contents. Nitrogen addition significantly decreased exchangeable Ca by up to 33% in large and small macroaggregates and exchangeable Mg by up to 27% in three aggregates but significantly increased extractable Fe, Mn and Cu concentrations (by up to 262%, 150%, and 55%, respectively) in all aggregate size classes. However, water addition only increased exchangeable Na, while available Fe and Mn were decreased by water addition when averaging across all N treatments and aggregate classes. The loss of exchangeable Ca and Mg under N addition and extractable Fe and Mn in soil aggregates under water addition might potentially constrain the productivity of this semi-arid grassland ecosystem.

KeywordsNitrogen deposition; Irrigation; Calcium; Magnesium; Manganese; Copper
Year of Publication2017
JournalScience of the Total Environment
Journal citation575 (1 January), pp. 564-572
Digital Object Identifier (DOI)https://doi.org/10.1016/j.scitotenv.2016.09.018
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeSustainability
Optimisation of nutrients in soil-plant systems: How can we control nitrogen cycling in soil?
Output statusPublished
Publication dates
Online07 Sep 2016
Publication process dates
Accepted02 Sep 2016
PublisherElsevier
Elsevier Science Bv
Copyright licensePublisher copyright
ISSN0048-9697

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