模拟毛叶苕子在路易斯安那州西北部种植对棉花生产的长期影响。
Modeling long-term effects of hairy vetch cultivation on cotton production in Northwest Louisiana.
机构信息
Red River Research Station, Louisiana State University Agricultural Center, Bossier City, LA 71112, United States.
Red River Research Station, Louisiana State University Agricultural Center, Bossier City, LA 71112, United States.
出版信息
Sci Total Environ. 2018 May 15;624:744-752. doi: 10.1016/j.scitotenv.2017.12.165. Epub 2017 Dec 27.
The use of hairy vetch as a winter cover crop for cotton production in Northwest Louisiana has contributed to sustaining cotton production as well as improving soil quality. To test the efficacy of hairy vetch (HV) cultivation as a natural N supplement for cotton production, a long-term field experiment lasting 27years was evaluated using the Denitrification-Decomposition (DNDC) model. Different N fertilization practices, including 0kgNha (PL_1), HV alone (PL_2), 44.8kgNha (PL_3), and 67.3kgNha (PL_4), were compared to evaluate nitrogen (N) response to cotton yield. Measured crop yield from each treatment was used to calibrate and validate the model. The DNDC model was employed to test the effects of N application scenarios on cotton yields and HV incorporation on N balance under irrigated and non-irrigated conditions. In model calibration, statistical indices for the model performance on cotton seed yield showed that PL_1 had a normalized root mean square error (NRMSE) value of 24.5%, a model efficiency (ME) value of 0.51, and a correlation coefficient (r) of 0.87 (P<0.01). The DNDC model was validated with PL_2, PL_3, and PL_4. PL_2, PL_3 and PL_4 had a NRMSE of 18.6%, 16.4% and 15.8% respectively, ME value of 0.19, 0.47 and 0.52 respectively, and an r of 0.75, 0.83 and 0.85 (P<0.05) respectively. Estimates of soil organic carbon (SOC) for HV treatment showed double the SOC content during a 27-year long-term experiment, while both treatments of 44.8kgNha and 67.3kgNha showed similar levels of SOC of a 25% increase compared to the control. Based on the scenario analysis, sustainable cotton yields do not require N fertilizer application under HV cultivated fields, and no yield differences were observed between irrigated and non-irrigated conditions.
利用毛叶苕子作为路易斯安那州西北部棉花生产的冬季覆盖作物，不仅有助于维持棉花的生产，还有助于提高土壤质量。为了测试毛叶苕子（HV）作为棉花生产天然氮源的效果，采用 Denitrification-Decomposition（DNDC）模型对一项持续 27 年的田间长期试验进行了评估。比较了不同的氮肥管理措施，包括 0kgNha（PL_1）、HV 单作（PL_2）、44.8kgNha（PL_3）和 67.3kgNha（PL_4），以评估氮（N）对棉花产量的响应。利用各处理的实测作物产量对模型进行了校准和验证。DNDC 模型用于测试在灌溉和非灌溉条件下，不同氮素施用量对棉花产量的影响以及 HV 对氮素平衡的影响。在模型校准过程中，模型对棉花种子产量的表现进行了统计指标评估，结果表明 PL_1 的归一化均方根误差（NRMSE）值为 24.5%，模型效率（ME）值为 0.51，相关系数（r）为 0.87（P<0.01）。用 PL_2、PL_3 和 PL_4 对 DNDC 模型进行了验证。PL_2、PL_3 和 PL_4 的 NRMSE 分别为 18.6%、16.4%和 15.8%，ME 值分别为 0.19、0.47 和 0.52，r 值分别为 0.75、0.83 和 0.85（P<0.05）。HV 处理下土壤有机碳（SOC）的估算值表明，在长达 27 年的长期试验中，SOC 含量增加了一倍，而 44.8kgNha 和 67.3kgNha 两种处理的 SOC 含量分别增加了 25%，与对照相比，SOC 含量相似。基于情景分析，在 HV 种植的田间不需要施用氮肥就能获得可持续的棉花产量，并且在灌溉和非灌溉条件下，产量没有差异。
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