Effects of Native AMF and Intercropping Reducing Nitrogen Loss from Soil-Water Interface in Purple Soil
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S157.4

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National Natural Science Foundation of China (No. 41561057), the Academician Expert Workstation Project (No. 2015IC022), and the Yunnan Agricultural University Soil Resources Utilization and Protection Provincial Innovation Team Project

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    Abstract:

    [Objective] In order to explore the reduction effects of native arbuscular mycorrhizal fungi (AMF) and intercropping reducing on the N loss from of nitrogen forms in purple soil-water interface in purple soil, a field experiment of runoff simulation under natural rainfalls was carried out in a field of purple soil, in an attempt so that to provide a theoretical basis for protecting the water environment and mitigating slowing the agricultural non-point source pollution caused by the nitrogen loss of from purple soil slope farmlands.[Method] The experiment was designed to have different planting patterns or mode[monocropping of maize (MM), maize/soybean intercropping (MSI), and monocropping of soybean (MS)] and different mycorrhizal treatments[inhibited (MI) and non-inhibited (NM)] . Samples of runoff and lateral infiltration were collected seven times during the rainy season for analysis of forms of Nitrogen (N) and their concentrations therein, and further for comparison between the treatments in effect on changes in form and translocation of Nitrogen.[Result] Results show that lateral infiltration or subsoil flow was the main path of N loss from soil-water interface in the purple soil, and nitrate N was the main form of N lost with the subsoil flow With sampling going on, the concentrations of total N and nitrate N in runoff fluctuated along a rising trend, while the concentration of ammonium N rose firstly and then declined. The concentration of total N concentration in lateral infiltration exhibited a trend of descending firstly, and then ascending and descending again, while the concentration of nitrate N did a gentle descending trend, but the concentration of ammonium N did a gentle trend of increasing first and then decreasing. Among all the composite treatments, Treatment NM+MSI was the lowest in concentration of total N and ammonium N in runoff and lateral infiltration and hence in total N loss, and significantly lower than all the other treatments. Treatment NM+MSI was 13.4% and 20.3%, respectively, lower than Treatment NM and Treatment MI in concentration of total N in runoff, 56.5% and 48.7%, respectively, lower in concentration of total N in lateral infiltration, 50.1% and 43.5%, respectively, lower in total N loss, 10.0% and 16.7%, respectively, lower in concentration of nitrate N in runoff, 51.3% and 42.9%, respectively, lower in concentration of nitrate N in total N loss with runoff, 10.5% and 26.0%, respectively, lower in concentration of ammonium N in runoff, 21.7% and 30.2%, respectively, lower in concentration of ammonium N in lateral infiltration, and 29.6% and 33.7%, respectively, lower in concentration of ammonium N in total N loss with lateral infiltration.[Conclusion] All the findings indicate that native AMF and maize/soybean intercropping has a certain potential to reduce nitrogen loss from the purple soil via soil-water interface.

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LI Ting, ZHANG Li, LIU Dahui, ZHANG Naiming, NING Dongwei, YUE Xianrong, XIA Yunsheng. Effects of Native AMF and Intercropping Reducing Nitrogen Loss from Soil-Water Interface in Purple Soil[J]. Acta Pedologica Sinica,2021,58(1):191-201.

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History
  • Received:September 11,2019
  • Revised:December 17,2019
  • Adopted:December 26,2019
  • Online: October 30,2020
  • Published: January 11,2021