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How Physical Disturbance and nitrogen Addition Affect the Soil Carbon Decomposition?

Phyton-International Journal of Experimental Botany 2022年第9期91卷 2087-2097页

作者： Muhammad Junaid nazir Xiuwei Zhang Daolin Du Feihai Yu Institute of Wetland Ecology&Clone Ecology/Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation Taizhou UniversityTaizhou318000China College of the Environment&Safety Engineering Jiangsu UniversityZhenjiang212013China

The decomposition of soil organic carbon(SOC)plays a critical role in regulating atmospheric CO_(2)concentrations and climate dynamics.However,the mechanisms and factors controlling SOC decomposition are still not fully understood.Here,we conducted a 60 days incubation experiment to test the effects of physical disturbance and nitrogen(n)addition on SOC decomposition.n addition increased the concentration of nO3-by 51%in the soil,but had little effect on the concentration of nH4+.n addition inhibited SOC decomposition,but such an effect differed between disturbed and undisturbed soils.In disturbed and undisturbed soils,application of n decreased SOC decomposition by 37%and 15%,respectively.One possible explanation is that extra n input suppressed microbial n mining and/or increased the stability of soil organic matter by promoting the formation of soil aggregates and incorporating part of the inorganic n into organic matter,and consequently decreased microbial mineralization of soil organic matter.Physical disturbance intensified the inhibition of n on SOC decomposition,likely because physical disturbance allowed the added n to be better exposed to soil microbes and consequently increased the availability of added n.We conclude that physical disturbance and n play important roles in modulating the stability of SOC.

关键词： Soil organic matter physical disturbance microbial n mining microbial biomass carbon n availability

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