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- W2779757624 abstract "Cattle feedlots are significant ammonia (NH3) emission sources, and cause high NH3 deposition. This study was conducted to investigate the responses of soil mineral nitrogen (N), percent cover of plant species, leaf N content, and leaf δ15N to NH3 deposition around a 17,500-head cattle feedlot in Victoria, Australia. Soil samples were collected in May 2015 at 100-m intervals along eight downwind transects, and plant samples were collected in June 2015 from five sites at 50- to 300-m intervals along a grassland transect within 1 km downwind of the feedlot. NH3 deposition was also monitored at five sites within 1 km downwind of the feedlot. The estimated NH3-N deposition rates ranged from 2.9 kg N ha−1 yr−1 at 1 km from the feedlot to 203 kg N ha−1 yr−1 at 100 m from the feedlot. The soil mineral N content was high (22–98 mg kg−1, mainly nitrate), significantly decreased with increasing distance from the feedlot, and significantly increased with increasing NH3-N deposition. With increasing NH3-N deposition, the percent cover of the herb species Cymbonotus lawsonianus increased significantly, but that of the grass species Microlaena stipoides decreased significantly. The leaf total N contents of the grass and herb species were high (>4%), and were linearly, positively correlated with the NH3-N deposition rate. Leaf δ15N values were linearly, negatively correlated with the N deposition rate. These results indicate that the leaf N contents and δ15N values of C. lawsonianus and M. stipoides may be bioindicators of N deposition." @default.
- W2779757624 created "2018-01-05" @default.
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- W2779757624 date "2018-03-01" @default.
- W2779757624 modified "2023-10-18" @default.
- W2779757624 title "Spatial variations in soil and plant nitrogen levels caused by ammonia deposition near a cattle feedlot" @default.
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- W2779757624 doi "https://doi.org/10.1016/j.atmosenv.2017.12.022" @default.
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