Response of soil ammonia volatilization to exogenous nitrogen input in Inner Mongolian desert grasslands

doi:10.7522/j.issn.1000-694X.2024.00071

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (6): 178-186.DOI: 10.7522/j.issn.1000-694X.2024.00071

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Response of soil ammonia volatilization to exogenous nitrogen input in Inner Mongolian desert grasslands

Yuliang Rao¹(), Chun Cao¹, Xiaoxue Zhang², Chang Lu³, Ping Yue²()

^1.Key Laboratory of Oasis Resource Environment and Sustainable Development of Gansu Province，School of Geography and Environmental Science，Northwest Normal University，Lanzhou 730070，China
^2.Ulat Desert Grassland Research Station / Key Laboratory of Adverse Physiology and Ecology in Cold and Arid Regions of Gansu Province，Northwest Institute of Eco-Environment Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^3.Department of Chemical and Environmental Engineering，Hetao College，Bayannur 015000，Inner Mongolia，China

Received:2024-05-13 Revised:2024-08-28 Online:2024-11-20 Published:2024-12-06
Contact: Ping Yue

Abstract

Abstract:

Ammonia （NH₃） volatilization is one of the important pathways of soil nitrogen loss in arid zones. However， the understanding of how soil ammonia volatilization responds to nitrogen deposition in the desert grasslands of Inner Mongolia， which is very sensitive and vulnerable to climate change， is still very limited. Therefore， this study takes Inner Mongolia desert grassland as the research object， and adopts the in situ dynamic observation means of the ventilation method to study the characteristics of soil ammonia volatilization and its key driving factors under different nitrogen deposition backgrounds， so as to provide key scientific support for the restoration of degraded vegetation and soil nitrogen management in the desert grassland area. The results of this study showed that soil ammonia volatilization rate showed a significant increase with increasing nitrogen input， but ammonia volatilization showed an exponential decrease in the first 20 days after nitrogen input， and then leveled off. It was also found that nitrogen loss in the form of NH₃ in the first 20 days after nitrogen input was lowest at low nitrogen inputs （0.5-3 g·m^-2·a^-1） at 33-39 percent， and higher at medium to high nitrogen input levels （6-48 g·m^-2·a^-1） at 55-75 percent. Further analysis showed that soil ammonia volatilization rate was significantly and positively correlated with soil ammonium nitrogen content， nitrate nitrogen content and soil moisture （P0.001）， while it was significantly and negatively correlated with soil pH （P0.01）. The results of structural equation modeling showed that N input and soil moisture were the most important factors affecting soil ammonia volatilization， and that N input mainly regulated the soil ammonia volatilization process by changing soil ammonium nitrogen content and pH， which in turn indirectly regulated the process of soil ammonia volatilization. In conclusion， the response of soil ammonia volatilization in Inner Mongolia desert grassland to nitrogen input is very sensitive， and the low amount of nitrogen input is more favorable to soil nitrogen retention than the high amount of nitrogen input， which provides scientific support for further in-depth study of nitrogen cycling in desert grassland under the background of elevated nitrogen deposition.

Key words: desert grassland, ammonia volatilization, nitrogen deposition, loss rate, structural equation modeling

CLC Number:

S153

Yuliang Rao, Chun Cao, Xiaoxue Zhang, Chang Lu, Ping Yue. Response of soil ammonia volatilization to exogenous nitrogen input in Inner Mongolian desert grasslands[J]. Journal of Desert Research, 2024, 44(6): 178-186.

Figures/Tables 5

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氮添加量 /(g·m^-2·a^-1)	土壤性质
氮添加量 /(g·m^-2·a^-1)	铵态氮/(mg·kg^-1)	硝态氮/(mg·kg^-1)	电导率/(μS·cm^-1)	pH	土壤湿度/%
0	5.89±0.43^a	3.26±0.33^a	96.68±5.90^a	9.11±0.03^a	2.55±0.004^a
0.5	5.57±0.55^a	4.49±0.55^a	95.87±9.36^a	9.09±0.03^a	2.74±0.003^a
1	6.19±0.26^a	6.67±1.21^a	116.65±17.78^a	9.05±0.04^ab	2.90±0.004^a
3	6.24±0.21^a	12.85±2.20^ab	118.78±10.89^a	9.11±0.03^a	2.69±0.001^a
6	6.35±0.76^a	21.23±1.04^b	118.02±6.79^a	8.98±0.03^a	3.07±0.004^a
12	13.07±0.73^b	22.02±2.88^b	113.30±3.00^a	8.99±0.03^bc	3.20±0.005^a
24	12.83±2.56^b	31.58±4.63^c	132.10±2.67^a	8.94±0.03^c	3.24±0.002^a
48	26.01±4.29^c	51.72±6.93^d	173.33±20.66^b	8.93±0.03^c	3.51±0.006^a

氮添加量 /(g·m^-2·a^-1)	土壤性质
氮添加量 /(g·m^-2·a^-1)	铵态氮/(mg·kg^-1)	硝态氮/(mg·kg^-1)	电导率/(μS·cm^-1)	pH	土壤湿度/%
0	5.89±0.43^a	3.26±0.33^a	96.68±5.90^a	9.11±0.03^a	2.55±0.004^a
0.5	5.57±0.55^a	4.49±0.55^a	95.87±9.36^a	9.09±0.03^a	2.74±0.003^a
1	6.19±0.26^a	6.67±1.21^a	116.65±17.78^a	9.05±0.04^ab	2.90±0.004^a
3	6.24±0.21^a	12.85±2.20^ab	118.78±10.89^a	9.11±0.03^a	2.69±0.001^a
6	6.35±0.76^a	21.23±1.04^b	118.02±6.79^a	8.98±0.03^a	3.07±0.004^a
12	13.07±0.73^b	22.02±2.88^b	113.30±3.00^a	8.99±0.03^bc	3.20±0.005^a
24	12.83±2.56^b	31.58±4.63^c	132.10±2.67^a	8.94±0.03^c	3.24±0.002^a
48	26.01±4.29^c	51.72±6.93^d	173.33±20.66^b	8.93±0.03^c	3.51±0.006^a

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Response of soil ammonia volatilization to exogenous nitrogen input in Inner Mongolian desert grasslands

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