杨晓琳,中国农业大学水利与土木工程学院副教授。主要从事多样化种植制度的节水固碳减排研究,先后主持国家自然科学基金青年基金、面上项目等多项。在Nature Communications、Field Crops Research、Agricultural Water Management等期刊发表论文50余篇。
作者简介:
杜太生,中国农业大学水利与土木工程学院教授。主要从事农业高效用水研究,先后主持和参加国家自然科学基金、国家重点研发计划项目课题等30多项。在本领域国际知名期刊Journal of Experimental Botany、Agricultural Water Management以及国内相关期刊发表论文130余篇。
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Different water saving grain-forage rotations and comprehensive benefit assessment in the low plains of Hebei Province
1.College of Water Resources & Civil Engineering/State Key Laboratory of Efficient Utilization of Agricultural Water Resources, China Agricultural University, Beijing 100083, China
2.College of Grassland and Technology, China Agricultural University, Beijing 100193, China
In order to promote the process of "grain to feed" and develop water-saving agriculture, a water-appropriate planting system should be constructed. This study focused on forage crops and food crops in Cangzhou, Hebei Province, where water is scarce. This study employed the SIMETAW model to quantify the water requirements (ETc) and irrigation demands (ETaw) of main forage crops (forage oats, silage maize, millet and summer sorghum) and staple grain crops (winter wheat and summer maize) from 1961 to 2020, analyzed the interannual variation trend of ETc of different tested crops and revealed the effect of meteorological factors on crop ETc during the past 60 years. The ROTAT model was further used to design five newly diversified forage-based crop rotations and assessed the comprehensive benefit index (CBI) based on Entropy-TOPSIS when considering equivalent yield, biomass, economic benefit, protein yield, water requirements and precipitation coupling degree of different crop rotations. The results showed that: 1) The annual average ETc of six crops sorted from high to low is winter wheat (463.5 mm)>summer maize (366.2 mm)>summer sorghum (354.6 mm)>forage oats (351.7 mm)>silage maize (341.8 mm)>millet (322.4 mm). 2) Winter wheat had the highest annual average ETaw, followed by forage oats, millet, summer maize, summer sorghum while silage maize had the lowest ETaw. 3) The annual ETc of six crops showed the decline trend from 1960 to 2020. The correlation analysis showed that solar radiation, sunshine and weed speed had the significant positive effect on ETc. 4) Compared to the conventional wheat-maize rotation, the forage oats-based rotations decreased ETc during the growth season by 14.9% to18.8% and lowered the ETaw by 15.1% to19.2%. 5) The CBI of forage oats-based rotations (0.54 to 0.73) were obviously higher than winter wheat-based rotations (0.32 to 0.37) based on Entropy-TOPSIS. Therefore, it is important to develop the forage crop-based rotations while considering food production for the sustainable water resources management and capacity in Cangzhou area.
杜太生,中国农业大学水利与土木工程学院教授。主要从事农业高效用水研究,先后主持和参加国家自然科学基金、国家重点研发计划项目课题等30多项。在本领域国际知名期刊Journal of Experimental Botany、Agricultural Water Management以及国内相关期刊发表论文130余篇。
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杜太生,中国农业大学水利与土木工程学院教授。主要从事农业高效用水研究,先后主持和参加国家自然科学基金、国家重点研发计划项目课题等30多项。在本领域国际知名期刊Journal of Experimental Botany、Agricultural Water Management以及国内相关期刊发表论文130余篇。
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