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The role of spring ephemerals and soil microbes in soil nutrient retention in a temperate desert

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Abstract

Aims

Nutrient uptake by ephemerals is a key element of nutrient retention in some hardwood forests. However, little information is available regarding the role of ephemerals and soil microbes in deserts.

Methods

Seasonal patterns of nitrogen (N) and phosphorus (P) uptake by spring ephemerals and soil microbes were measured in 2011–2013 in a temperate desert. Seasonal dynamics of soil inorganic N and available P, nitrate leaching and soil microbial N and P were also monitored.

Results

Ephemerals exhibited a large nutrient pool in their growing season, with net N and P uptakes of 0.49–0.94 g m−2 and 0.05–0.09 g m−2, respectively, in normal precipitation years (2011 and 2013). Within 6 months of death, spring ephemerals released 35 % of litter N and 60 % of litter P. N and P microbial immobilizations were 3.6 and 4.5 times greater, respectively, than spring ephemeral uptake during normal precipitation years, but soil microbes showed a net nutrient release during the dry year (2012).

Conclusions

This study demonstrated that the relative importance of soil microbes and spring ephemerals in soil nutrient retention is related to annual precipitation, with higher nutrient retention by soil microbes in normal precipitation years and by spring ephemerals in dry year.

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Acknowledgments

We thank Lan Zhong dong, Liu Yan and Wu Lin feng in the Fukang Station of Desert Ecology for their field and lab work, and professor Hans Lambers in the University of Western Australia for valuable comments on the early version of this paper. We also thank the two anonymous reviewers for their valuable and helpful comments on our paper. This work was sponsored by the Chinese National Natural Scientific Foundation (31570455, 31370010 & 41371004).

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Correspondence to Yan Li.

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Responsible Editor: Klaus Butterbach-Bahl.

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Huang, G., Su, Y.G., Zhu, L. et al. The role of spring ephemerals and soil microbes in soil nutrient retention in a temperate desert. Plant Soil 406, 43–54 (2016). https://doi.org/10.1007/s11104-016-2861-x

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  • DOI: https://doi.org/10.1007/s11104-016-2861-x

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