Soil microbial biomass and extracellular enzyme-mediated mineralization potentials of carbon and nitrogen under long-term fertilization (> 30 years) in a rice-rice cropping system

文献类型： 外文期刊

第一作者： Ashraf, Muhammad Nadeem

作者： Ashraf, Muhammad Nadeem;Gao Jusheng;Wu Lei;Mustafa, Adnan;Hussain, Babar;Zhang Wenju;Xu Minggang;Waqas, Ahmed;Aziz, Tariq;Khan, Waqas-ud-Din;Khan, Waqas-ud-Din;Shafeeq-ur-Rehman;Farooq, Muhammad

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关键词： Microbial biomass; Enzymes; Mineralization; Long-term fertilization; Soil fertility

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.587 ）

ISSN： 1439-0108

年卷期： 2021 年 21 卷 12 期

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收录情况： SCI

摘要： Purpose Soil microbial biomass and extracellular enzymes are involved in the decomposition of soil organic matter, a temporary nutrient pool for plants. This study was conducted to evaluate the mineralization potentials of carbon (CMP) and nitrogen (NMP), and the relationship of CMP and NMP with microbial biomass and extracellular enzymes in soil fertilized with mineral and manure amendments for 3 decades. Materials and methods A long-term experiment (37 years) consisted of seven fertilizer treatments, including unfertilized control (CK); nitrogen, phosphorus, and potassium (NPK); manure (M); manure plus phosphorus and potassium (PKM); nitrogen and potassium plus manure (NKM); nitrogen and phosphorus plus manure (NPM); and NPK plus manure (NPKM), was selected. Results and discussion Compared to the CK treatment, the long-term mineral fertilizer (NPK) and combined manure plus mineral fertilization (e.g., M, PKM, NKM, NPM, and NPKM) significantly increased soil microbial biomass carbon (SMBC) by 58% and 131% and nitrogen (SMBN) by 66% and 161%, respectively. Similarly, soil microbial biomass phosphorus (SMBP) also significantly increased by 67-156% in combined manure and mineral fertilizer treatments than the CK and NPK treatment. Higher values of beta-glucosidase and cellobiohydrolase activities were observed with the application of PKM. In comparison with CK, the application of combined manure and mineral fertilization significantly increased the leucine aminopeptidase and N-acetyl-glucosaminidase enzyme by 129% and 175%, respectively. Soil CMP and NMP significantly increased by 231-307% and 176-289% in combined treatments than the CK. A significant positive correlation was also observed between the microbial biomass, extracellular enzymes, and the CMP and NMP (R-2 = 0.66-0.84, 0.44-0.76, P < 0.0001). Conclusions This study suggested that long-term manure application greatly increased the microbial biomass and enzyme activities, playing an important role in co-mineralization potentials of organic carbon and nitrogen for improving soil fertility.

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