Girma Birru, Andualem Shiferaw, Tsegaye Tadesse, Brian Wardlow, Virginia L. Jin, Marty R. Schmer, Tala Awada, Tulsi Kharel, Javad Iqbal
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Local weather data during the historical period were used, while climate change projections were based on the Canadian Earth System Model 2 dynamically downscaled using the Canadian Centre for Climate Modelling and Analysis Regional Climate Model 4 under two representative concentration pathways (RCP), namely, RCP4.5 and RCP8.5. Simulations results indicated that CC impacts on corn yield were nonsignificant under historical and climate change conditions. Climate change created favorable conditions for CC growth, resulting in an increase in biomass. CC reduced N leaching under climate change scenarios compared to an average reduction of 60% (7 kg ha<i><sup>−</sup></i><sup>1</sup>) during the historical period. CC resulted in a 6% (27 mm) reduction in total water in soil profile (140 cm) and 22% (27 mm) reduction in plant available water compared to no cover crop during historical period. 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引用次数: 0
摘要
连续玉米(Zea mays L.)系统内的秋季种植覆盖作物(CC)提供了潜在的农业生态系统效益,包括减轻温度升高和降水模式变化的影响。使用农业技术转让决策支持系统(DSSAT)模型进行了长期模拟,以评估在内布拉斯加州东部历史(1991-2020年)和预测气候(2041-2070年)下,谷类黑麦(Secale cereale L.)对免耕连续玉米产量和土壤性质的影响。使用了历史时期的当地天气数据,而气候变化预测是基于加拿大地球系统模型2(CanESM2),该模型使用加拿大气候建模和分析中心的区域气候模型4(CanRCM4)在两个代表性浓度路径(RCP)下动态缩小,即RCP4.5和RCP8.5。模拟结果表明,在历史和气候变化条件下,CC对玉米产量的影响不显著。气候变化为CC的生长创造了有利条件,导致生物量增加。在气候变化情景下,覆盖作物减少了氮的浸出,而在历史时期平均减少了60%(7 kg ha-1)。在历史时期,与无覆盖作物(NCC)相比,覆盖作物导致土壤剖面(140 cm)(SW)中的总水分减少了6%(27 mm),植物有效水分减少了22%(27毫米)。覆盖作物减少了累积的季节性地表径流/土壤蒸发,增加了SOC的积累率。这项研究为气候变化如何影响谷类黑麦CC在连续玉米生产中的表现提供了有价值的信息,并应推广到更广泛的地点和CC物种。
Cover crop performance under a changing climate in continuous corn system over Nebraska
Fall-planted cover crop (CC) within a continuous corn (Zea mays L.) system offers potential agroecosystem benefits, including mitigating the impacts of increased temperature and variability in precipitation patterns. A long-term simulation using the Decision Support System for Agrotechnology Transfer model was made to assess the effects of cereal rye (Secale cereale L.) on no-till continuous corn yield and soil properties under historical (1991–2020) and projected climate (2041–2070) in eastern Nebraska. Local weather data during the historical period were used, while climate change projections were based on the Canadian Earth System Model 2 dynamically downscaled using the Canadian Centre for Climate Modelling and Analysis Regional Climate Model 4 under two representative concentration pathways (RCP), namely, RCP4.5 and RCP8.5. Simulations results indicated that CC impacts on corn yield were nonsignificant under historical and climate change conditions. Climate change created favorable conditions for CC growth, resulting in an increase in biomass. CC reduced N leaching under climate change scenarios compared to an average reduction of 60% (7 kg ha−1) during the historical period. CC resulted in a 6% (27 mm) reduction in total water in soil profile (140 cm) and 22% (27 mm) reduction in plant available water compared to no cover crop during historical period. CC reduced cumulative seasonal surface runoff/soil evaporation and increased the rate of soil organic carbon buildup. This research provides valuable information on how changes in climate can impact the performance of cereal rye CC in continuous corn production and should be scaled to wider locations and CC species.
期刊介绍:
Articles in JEQ cover various aspects of anthropogenic impacts on the environment, including agricultural, terrestrial, atmospheric, and aquatic systems, with emphasis on the understanding of underlying processes. To be acceptable for consideration in JEQ, a manuscript must make a significant contribution to the advancement of knowledge or toward a better understanding of existing concepts. The study should define principles of broad applicability, be related to problems over a sizable geographic area, or be of potential interest to a representative number of scientists. Emphasis is given to the understanding of underlying processes rather than to monitoring.
Contributions are accepted from all disciplines for consideration by the editorial board. Manuscripts may be volunteered, invited, or coordinated as a special section or symposium.