Phosphatase activities and available nutrients in soil aggregates affected by straw returning to a calcareous soil under the maize–wheat cropping system

Frontiers in Environmental Science

Environmental Science

Peng Leng¹  Zhen Wang²  Qing-Dian Han³  Guang-Na Zhang³  Xiang-Jie Lin⁴ 

[1] Linyi Academy of Agricultural Sciences, Linyi, China;School of Pharmacy, Linyi University, Linyi, China;Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science, Linyi University, Linyi, China;Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Agriculture and Forestry Science, Linyi University, Linyi, China;Philippine Christian University Center for International Education, Manila, Philippines;

关键词: straw returning;    soil aggregate;    phosphomonoesterase;    phosphodiesterase;    pyrophosphatase;   

DOI  :  10.3389/fenvs.2023.1208323

 received in 2023-04-19, accepted in 2023-06-29,  发布年份 2023

来源: Frontiers

【 摘 要 】

The objective of this study was to investigate the effects of different rates of straw returning on soil aggregate stability, phosphatase activities, and the available nitrogen (N) and phosphorus (P) within different soil aggregate sizes. The experiment included five treatments: 1) no straw returning and no chemical fertilizer, 2) chemical fertilizer only (150 kg N ha-1, 75 kg P ha-1, and 75 kg K ha-1), 3) 20% straw returning with chemical fertilizer, 4) 60% straw returning with chemical fertilizer, and 5) 100% straw returning with chemical fertilizer. Soil samples were collected 3.5 years after the start of the experiment and separated into four aggregate sizes (<0.25 mm, 0.25–1 mm, 1–2 mm, and 2–7 mm) using the dry sieving method. Soil acid phosphomonoesterase (AcP) and alkaline phosphomonoesterase (AlP); phosphodiesterase (PD); pyrophosphatase (PrA) activities; and soil NO3−−N, NH4+−N, and resin-P were determined within soil aggregates. The results showed that straw returning rates did not significantly impact soil aggregate distribution. However, straw returning increased soil AcP, AlP, and PD in <2 mm aggregates, and high rates of straw returning led to high enzyme activities. Soil phosphatase activities were also higher in 1–2 mm aggregates. All straw returning and chemical fertilization treatments increased soil NO3−−N and resin-P concentrations but had much less effect on soil NH4+−N concentrations. Additionally, the study revealed that soil pH, the concentrations of NH4+−N, NO3−−N, resin-P, and CaCO3 significantly influenced soil phosphatase activities, but their impact varied across different sizes of aggregates.

【 授权许可】

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Copyright © 2023 Lin, Zhang, Wang, Han and Leng.