| 摘要: |
| 【目的】为探索生物炭施肥管理对沿海垦区盐渍化土壤水稻产量影响,开展测坑栽培试验。【方法】根据测坑栽培试验数据对ORYZA_V3作物生长模型进行校正和验证,利用验证后的模型定量评估7个不同施氮肥情景模拟对水稻产量影响。【结果】ORYZA_V3模型具备模拟不同施肥管理措施下盐渍土水稻产量的能力。在低施肥量情景下,施用生物炭对水稻产量影响明显,产量增加量较大,而高施肥量情景下(施氮量超过235kg/hm2),土壤中养分含量达到饱和,施用生物炭对产量促进作用不明显。添加2%生物炭和5%生物炭处理产量分别在235kg/hm2和141kg/hm2施氮量水平上几乎达到峰值,之后继续增加施氮量对产量影响不明显。【结论】低施肥量情境下,添加5%生物炭对水稻产量促进作用最大,高施肥量情境下,2%生物炭和氮肥联合施用成本相对低,且产量高。研究结果可为生物炭施肥管理在沿海滩涂垦区农田推广应用提供实际参考。 |
| 关键词: 氮肥;盐渍土;水稻产量;ORYZA_V3模型;生物炭 |
| DOI： |
| 分类号:S511 |
| 基金项目: |
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| Study on Optimal Measures of Biochar and Fertilization for Rice of Saline Soil in a Coastal Reclamation Region Based on ORYZA_V3 Model |
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ALIMU.A-bu-lai-ti, SHE Dong-li
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College of Agricultural Science and Engineering,Hohai University
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| Abstract: |
| 【Objective】To study the effects of biochar and fertilizer management on rice yield in saline soil, a pit cultivation experiment was carried out in a coastal reclamation region. 【Method】The ORYZA_V3 crop growth model was calibrated and validated according to the pit cultivation test data, the validated model was used to quantitatively evaluate the impact of 7 different nitrogen fertilizer scenarios on rice yield. 【Result】The ORYZA_V3 model had the ability to simulate rice yield in saline soil under different fertilization management measures. Under the low fertilization scenario, the application of biochar had a significant effect on rice yield, and the yield increase was greater. However, under the high fertilization scenario (nitrogen fertilization exceeded 235kg/hm2), the nutrient content in the soil was saturated, and the application of biochar had no significant effect on yield improvement. With the addition of 2% biochar and 5% biochar, the yield almost reached the peak at 235kg/hm2 and 141kg/hm2 nitrogen application levels, and the subsequent increase in nitrogen fertilizer had no significant effect on the yield. Under low fertilization scenario, adding 5% biochar had the greatest effect on rice yield.【Conclusion】 Under high fertilization scenario, the combined application cost of 2% biochar and nitrogen fertilizer was relatively low, and the rice yield was relatively high. The research results of this paper provided a practical reference for the application of biochar and fertilization management in farmland along a coastal reclamation region. |
| Key words: Nitrogen fertilizer; saline soil; rice yield; ORYZA_V3 Model; biochar |
