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000864342 0247_ $$2doi$$a10.1016/j.soilbio.2019.06.003
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000864342 1001_ $$0P:(DE-HGF)0$$aWu, Lei$$b0
000864342 245__ $$aSoil organic matter priming and carbon balance after straw addition is regulated by long-term fertilization
000864342 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2019
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000864342 520__ $$aStraw incorporation is crucial to soil organic carbon (SOC) sequestration, thus improving soil fertility and mitigating climate change. The fate of straw C and the associated net SOC balance remain largely unexplored, particularly in soils subjected to long-term mineral and organic fertilization. To address this, soil (δ13C: –19‰) that had been continuously cropped with maize for 31 years and subjected to five long-term fertilization regimes, including (i) control (Unfertilized), (ii) mineral fertilizer (NPK) application, (iii) 200% NPK (2 × NPK) application, (iv) manure (M) application, and (v) NPK plus manure (NPKM) application, was incubated with or without addition of rice straw (δ13C: –29‰) for 70 days. Straw addition largely primed SOC mineralization. The priming effect (PE) was considerably higher in 2 × NPK (+122% of CO2 from soil without straw addition) but lower in M (+43%) relative to the unfertilized soil (+82%), highlighting the importance of fertilization in controlling PE intensity. Fertilization increased the straw-derived microbial biomass C by 90–577% and straw-derived SOC by 34–68% compared to the unfertilized soil, primarily due to the increased abundance of Gram-negative bacteria and cellobiohydrolase activity. Straw-derived SOC was strongly positively correlated with straw-derived microbial biomass C, suggesting that dead microbial biomass (necromass) was a dominant precursor of SOC formation. Consequently, fertilization facilitated microbial utilization of straw C and its retention in soil, particularly in the M and NPKM fertilized soils. The amounts of straw-derived SOC overcompensated for the SOC losses by mineralization, resulting in net C sequestration which was highest in the NPK fertilized soil. Our study emphasizes that NPK fertilization decreases the intensity of the PE induced by straw addition and increases straw C incorporation into SOC, thus facilitating C sequestration in agricultural soils.
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000864342 7001_ $$0P:(DE-HGF)0$$aZhang, Wenju$$b1
000864342 7001_ $$0P:(DE-HGF)0$$aWei, Wenjuan$$b2
000864342 7001_ $$0P:(DE-HGF)0$$aHe, Zhilong$$b3
000864342 7001_ $$0P:(DE-HGF)0$$aKuzyakov, Yakov$$b4
000864342 7001_ $$0P:(DE-Juel1)145865$$aBol, Roland$$b5
000864342 7001_ $$0P:(DE-HGF)0$$aHu, Ronggui$$b6$$eCorresponding author
000864342 773__ $$0PERI:(DE-600)1498740-5$$a10.1016/j.soilbio.2019.06.003$$gVol. 135, p. 383 - 391$$p383 - 391$$tSoil biology & biochemistry$$v135$$x0038-0717$$y2019
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