Investigating the effect of atmospheric nitrogen deposition on  annual alfalfa roots and biochemical properties of Rangeland soil

Daneshi, Mohammad; Azimi, Mojgansadat; Niknahad Gharehmakhor, Hamid; Faghani, Elham

doi:10.22092/ijrdr.2024.130967

Document Type : Research Paper

Authors

¹ PhD. Student in Range Management, Department of Range Management, Faculty of Range and Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

² Associate Prof., Department of Range Management, Faculty of Range and Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

³ Assistant Prof., Department of Range Management, Faculty of Range and Watershed Management, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran

⁴ Assistant Professor, Agronomy Department, Cotton Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran

10.22092/ijrdr.2024.130967

Abstract

Background and objectives
Due to the increase in the consumption of fossil fuels and chemical fertilizers, especially nitrogen-containing fertilizers, the entry of nitrogen into the cycle of ecosystems has been more than normal.Nitrogen deposition as a consequence of increasing nitrogen input to the atmosphere, can be a threat to ecosystems. It can affect soil properties, soil microorganisms and their activities, vegetation and animals. The aim of the present study is to investigate the effects of deposition of different rates of atmospheric nitrogen on the biochemical properties of a summer rangeland's soil.

Methodology
For this purpose, the seeds of Medicago sativa were planted in 36 pots containing rangeland soil in a completely randomized block design. Two months after seed germination in pots, six Nitrogen treatments included control,30, 60,90,120 and 150 kg ammonium nitrate/ha which dissolved in water were applied in 6 replications during a period of 75 days. At the end of experiment, some soil biochemical properties (acidity, electrical conductivity, absorbable phosphorus, total nitrogen, organic carbon and exchangeable potassium along with biomass and microbial respiration) and Root weight and depth factors were measured. Data analysis was done using analysis of variance method and mean comparison was done using Duncan's test.

Results
The results demonstrated that increasing the level of ammonium nitrate deposition to 60 and 90 kg per hectare per year, despite the significant increase (p < 0.05) of organic carbon and total soil nitrogen, causes a significant decrease in other measured biochemical properties of the soil (p < 0.05). An increase in nitrogen deposition in the early stages may be partially responsible for root growth, but with nitrogen saturation in the soil and the occurrence of nitrate leaching, as well as the loss of soil fertility, unfavorable conditions for root growth are provided. With the increase of nitrogen deposition in the soil, up to the level of 60 kg /ha, the average respiration and microbial biomass increased, But at higher levels of nitrogen deposition, respiration and microbial biomass decreased.
Conclusion
In case of an increase in mineral nitrogen deposition in the studied area, it is recommended to use the Medicago sativa in the improvement of vegetation restoration projects of summer rangelands to absorb the deposed mineral nitrogen in excess of the soil holding capacity, its alleviate negative consequences and creating a suitable root zone for the the activity of soil microbial.

Keywords

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Iranian Journal of Range and Desert Research

Investigating the effect of atmospheric nitrogen deposition on annual alfalfa roots and biochemical properties of Rangeland soil

References

References

Volume 30, Issue 4
February 2024
Pages 542-556

Investigating the effect of atmospheric nitrogen deposition on annual alfalfa roots and biochemical properties of Rangeland soil

References

References

Volume 30, Issue 4February 2024Pages 542-556

Volume 30, Issue 4
February 2024
Pages 542-556