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[Nitrate vertical transport and simulating model in saturated soils in typical region]
Jian-cai Deng1, Xiao-min Chen, Xin Jiang
1State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue= Huanjing Kexue
|July 12, 2005
Summary
Nitrate transport in farmland soil is unaffected by concentration but influenced by cations like Ca2+. Mathematical models accurately predict nitrate leaching, aiding soil management.
Area of Science:
- Agricultural Science
- Environmental Science
- Soil Science
Context:
- Farmland soil in the Fengqu region, Henan Province, faces nitrate transport challenges.
- Understanding nitrate vertical transport is crucial for sustainable agricultural practices and water quality protection.
Purpose:
- To investigate the vertical transport characteristics of nitrate in farmland soil under laboratory conditions.
- To evaluate the influence of nitrate concentration and co-existing cations (K+, Ca2+) on nitrate transport dynamics.
- To assess the applicability of the CXTFIT2.0 model for estimating nitrate leaching.
Summary:
- Simulated soil columns revealed that nitrate concentration (100-200 mg/L) did not significantly alter breakthrough curves (BTCs) under saturated conditions.
- Co-existing Ca2+ ions extended nitrate outflow time in deeper layers of yellow fluvo-aquic soil, leading to lower, more even BTC peaks.
- The CXTFIT2.0 model accurately estimated nitrate leaching mass, with fitted BTCs showing high correlation (0.8594-0.9978) to observed data.
Impact:
- Provides insights into nitrate leaching behavior in different soil types, informing agricultural management strategies.
- Validates the use of the CXTFIT2.0 model for predicting nitrate movement, supporting environmental risk assessment.
- Highlights the role of cation exchange in modulating nitrate transport, crucial for optimizing fertilizer application and minimizing environmental contamination.