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Potential short-term effects of yak excreta addition on peat soil gross nitrogen transformations of Zoige peatland under laboratory conditions(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 01
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Potential short-term effects of yak excreta addition on peat soil gross nitrogen transformations of Zoige peatland under laboratory conditions
WANG Xingling1 2 3# XUE Dan1 2# CHEN Huai1 2** LIU Jianliang1 2 ZHAN Wei1 2 HU Ji1 2 ZHANG Jinbo4 & Christoph Müller5
1 Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China 2 Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Aba 624400, China 3University of Chinese Academy of Sciences, Beijing 100049, China 4School of Geography Science, Nanjing Normal University, Nanjing 210023, China 5Department of Plant Ecology, Justus-Liebig University Giessen, Giessen 35392, Germany
gross nitrogen transformation MCMC numerical model yak excreta Zoige peatland

Yak graze extensively on the alpine Zoige peatland in the eastern Qinghai-Tibetan Plateau, and large amounts of excrements are directly deposited onto the alpine peatland. However, information on peat soil gross nitrogen transformations after yak excreta return is limited. In this study, we investigated the potential short-term effects of yak excrements on peat soil gross nitrogen transformation by performing 15N tracing under laboratory conditions. The results showed that the total NH4+-N production was approximately twice higher in the dung-affected soil (17.49 mg kg-1 d-1) than in the CK treatment (8.94 mg kg-1 d-1). The mineralization of organic nitrogen was the main source of NH4+-N in both treatments, with approximately 57% of the total nitrogen mineralization resulting from the recalcitrant organic matter in the dung-affected soil, while amounting to 63% from the mineralization of soil-labile organic matter in CK. The total consumption of NH4+-N was higher than its production in both soils, leading to net NH4+-N consumption in the soils. Approximately 70% and 91% of the total NH4+-N consumption in the CK and dung-affected soils, respectively, were used for microbial immobilization to recalcitrant organic nitrogen pool. Autotrophic nitrification was the major NO3--N formation mechanism in both soils, which were 5.31 mg kg-1 d-1 and 2.13 mg kg-1 d-1 in the CK and drug-affected soil, respectively. Meanwhile, dissimilatory nitrate reduction in the dung-affected soil was slightly higher than in the CK soil, indicating that yak dung addition could reduce potential NO3--N leaching risks. Over the 19 incubation periods, the largest cumulative N2O emission, which was 7.81 mg/kg, occurred in the dung-affected soil, while the lowest value (3.04 mg/kg) appeared in the urine-affected soil. The addition of both yak dung and urine significantly (P < 0.01) increased soil CH4 and CO2 emissions. In conclusion, our findings suggested that yak dung might increase soil nitrogen supply capacity and decrease potential nitrate leaching risks by increasing gross NH4+-N mineralization, inhibiting autotrophic nitrification, and promoting dissimilatory nitrate reduction to ammonium. Yak dung slightly increased soil N2O emission, while yak urine addition significantly decreased it. In addition, the addition of both yak dung and urine largely increased soil CO2 and CH4 emissions.


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