数字农科院2.0

Soil microbial biomass and extracellular enzymes regulate nitrogen mineralization in a wheat-maize cropping system after three decades of fertilization in a Chinese Ferrosol

文献类型： 外文期刊

作者： Sehrish Ali;Li Dongchu;Huang Jing;Waqas Ahmed;Muhammad Abbas;Muhammad Qaswar;Christian Kofi Anthonio;Zhang Lu;Wang Boren;Xu Yongmei;Zhang Huimin

作者机构：

关键词： Extracellular enzymes; Long-term fertilization; N availability; Nitrogen mineralization; Soil fertility; Soil microbial biomass

期刊名称： J. Soils Sed.

ISSN： 1439-0108

年卷期： 2021 年 21 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： Purpose: Soil net nitrogen (N) mineralization is a vital process that impacts the global N cycling and regulates the N availability for plant development. The objectives of this study were to evaluate the response of N mineralization to long-term organic versus inorganic fertilization and to quantify the relationships between N mineralization and soil microbial characteristics in the ferrosol (red soil) of South China after 30 years of mineral and manure application in a wheat-maize cropping system. Materials and methods: Soil was sampled from a wheat-maize rotation system, consisting of five treatments. The treatments included (1) CK (no fertilizer), (2) PK (synthetic phosphorus and potassium fertilizer), (3) NK (synthetic nitrogen and K fertilizer), (4) N (synthetic N fertilizer), and (5) NPKM (synthetic NPK fertilizer and manure). The sampled soil was analyzed for physicochemical parameters and incubated for the determination of N mineralization, soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN), and associated soil enzymes related to C and N cycling. Results and discussion: Results showed that NPKM increased soil organic carbon (SOC), available P (AP), total P (TP), and total nitrogen (TN) by 132%, 880%, 293%, and 76% respectively, over the control (CK). Among different treatments, soil microbial biomass nitrogen (SMBN) and carbon (SMBC) were highest under the NPKM treatment. N-cycling and P-cycling enzyme activities also showed significant differences among treatments. N-Acetyl-β-d-glucosaminidase (NAG), leucine-aminopeptidase (LAP), and acid phosphatase (AcP) activities were also highest under the NPKM treatment, at 650.36, 32.36, and 23.41 (mol g−1 h−1), respectively. A linear increase was observed in the NO3−-N and NH4+-N concentrations throughout the 90-day incubation period. NPKM showed a maximum N mineralization potential (No) and mineralization rate constant, k (NMR), at the end of the incubation period. A principal component analysis (PCA) interpreted the differences among fertilization and their effects on net N mineralization. A significant (p ≤ 0.05) positive correlation was observed between SMBC (R2 = 0.87), SMBN (R2 = 0.92), enzyme activities, and the No. Structural equation modeling (SEM) revealed that SOC, TN, and TP directly affected mineralization, while SMBC and SMBN indirectly affected the net mineralization. Conclusion: Manure input increased the extracellular enzymes in soil, which accelerated the net N mineralization due to enhanced soil microbial activities. Consequently, long-term manure addition appears to be an optimal approach to meet the nutrient demands and to enhance the N availability in a wheat-maize cropping system. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

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