College of Agronomy and Biotechnology, China Agricultural University and Key Laboratory of Farming system, Ministry of Agriculture and Rural Affairs of China, Beijing, China.
J Sci Food Agric. 2021 Jul;101(9):3889-3897. doi: 10.1002/jsfa.11027. Epub 2021 Jan 18.
Northeast China is one of the most important maize producing areas in China. Due to limitations on crop growth resulting from temperature, whether this area can realize mechanical kernel harvesting maize (MKHM) will directly affect the stable development of maize in the region. The effects of climate change on the northern limits of early maturing MKHM were also analyzed in the study.
The mean temperature during the maize growth period increased at a rate of 0.22 °C/10a from 1960 to 2018. The average growth periods for early, middle- and late-maturing common harvest maize (CHM) were 123, 135, and 140 days, respectively, and the accumulated temperature above 10 °C (AAT10) was 2400 °C, 2800 °C, and 3100 °C. The early maturing MKHM growth period was about 20 days longer than that of early maturing CHM, and thus the AAT10 of the MKHM was 2700 °C. From 2000-2018, the northern limits for the early maturing CHM maize planting were located from south of Nenjiang and Wudalianchi (47° 98' N-49° 74' N), while the northern limits for the early maturing MKHM maize were located in south Keshan, Nehe, and Hailun (46° 32' N-48° 70' N), which was about 148 km southward compared to the northern limits of the early maturing CHM maize.
This study not only confirmed the northern limits of early maturing MKHM maize but also indicated that the development of MKHM offsets the influences of climate change on the northern limits of maize planting. This is very important for the sustainable development of maize in the region. © 2020 Society of Chemical Industry.
中国东北地区是中国最重要的玉米产区之一。由于温度对作物生长的限制，该地区能否实现机械收获玉米（MKHM）直接影响该地区玉米的稳定发展。本研究还分析了气候变化对早期成熟 MKHM 北界的影响。
1960 年至 2018 年期间，玉米生长期的平均气温以 0.22°C/10a 的速度升高。早、中、晚熟普通收获玉米（CHM）的平均生长期分别为 123、135 和 140 天，10°C 以上的积温（AAT10）分别为 2400°C、2800°C 和 3100°C。早期成熟的 MKHM 生长期比早期成熟的 CHM 长约 20 天，因此 MKHM 的 AAT10 为 2700°C。2000-2018 年，早熟 CHM 玉米种植的北界位于嫩江和五大连池以南（47° 98' N-49° 74' N），而早熟 MKHM 玉米的北界位于克山、讷河和海伦南部（46° 32' N-48° 70' N），与早熟 CHM 玉米的北界相比，向南约 148 公里。
本研究不仅证实了早期成熟 MKHM 玉米的北界，还表明 MKHM 的发展抵消了气候变化对玉米种植北界的影响。这对该地区玉米的可持续发展非常重要。© 2020 化学工业协会。
