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nitrogen fertilization degrades soil aggregation by increasing ammonium ions and decreasing biological binding agents on a Vertisol after 12 years

引用

Pedosphere 2022年第4期32卷 629-636页

作者： Zichun GUO Wei LI Mahbub UL ISLAM Yuekai WANG Zhongbin ZHANG Xinhua PENG State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Crop Research Institute Anhui Academy of Agricultural SciencesHefei 230031China University of Chinese Academy of Sciences Beijing 10049China Bangladesh Agricultural Research Institute Gazipur 1701Bangladesh

Degraded soil aggregation arising from nitrogen(N)fertilization has been reported in many studies;however,the mechanisms have not yet been *** the impact of N fertilization on soil aggregation would help to improve soil structure and sustain high crop *** objective of this study was to determine the impact of long-term N fertilization on soil aggregation and its association with binding and dispersing agents.A 12-year(2008–2019)N fertilization field experiment on a Vertisol was performed,covering a wide range of N application rates(0,360,450,540,630,and 720 kg ha-1 year-1)and including straw management(straw return and straw removal)in a wheat(Triticum aestivum L.)-maize(Zea mays L.)cropping *** samples of 0–20 cm depth were collected from 12 field treatments with 3 replications in *** aggregate stability(mean weight diameter(MWD))and contents of soil organic carbon(SOC),glomalin-related soil protein(GRSP),microbial biomass carbon(MBC),and mineral N(NH4+and NO3-)were ***-term N fertilization under straw removal conditions reduced soil MWD by 12%–18%at N rates from 0 to 720 kg ha-1 compared to that under straw return(P0.05);consequently,it improved soil ***,our results indicate that long-term N fertilization may degrade soil aggregation because of the increases in monovalent ions(H+and NH4+)and the decrease in MBC during soil acidification,especially when the applied N dose exceeded 360 kg ha-1 *** finding can minimize the negative structural impacts on Vertisol.

关键词： aggregating agents aggregate stability long-term nitrogen fertilization soil structure straw incorporation

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