@Article{phyton.2022.021412,
AUTHOR = {Muhammad Junaid Nazir, Xiuwei Zhang, Daolin Du, Feihai Yu},
TITLE = {How Physical Disturbance and Nitrogen Addition Affect the Soil Carbon Decomposition?},
JOURNAL = {Phyton-International Journal of Experimental Botany},
VOLUME = {91},
YEAR = {2022},
NUMBER = {9},
PAGES = {2087--2097},
URL = {http://www.techscience.com/phyton/v91n9/47725},
ISSN = {1851-5657},
ABSTRACT = {The decomposition of soil organic carbon (SOC) plays a critical role in regulating atmospheric CO<sub>2</sub> 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 NO<sub>3</sub><sup>-</sup> by 51% in the
soil, but had little effect on the concentration of NH<sub>4</sub><sup>+</sup>. 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.},
DOI = {10.32604/phyton.2022.021412}
}