Negative effects of climate warming on maize yield are reversed by the changing of sowing date and cultivar selection in Northeast China

被引:210
作者
Liu, Zhijuan [1 ,2 ]
Hubbard, Kenneth G. [2 ]
Lin, Xiaomao [3 ,4 ]
Yang, Xiaoguang [1 ]
机构
[1] China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China
[2] Univ Nebraska, Sch Nat Resources, Lincoln, NE 68583 USA
[3] Kansas State Univ, Dept Agron, Plant Sci Ctr, Manhattan, KS 66506 USA
[4] LI COR Biosci, Lincoln, NE 68504 USA
基金
美国国家科学基金会;
关键词
climate change; crop simulation model APSIM; cultivar; maize; Northeast China; sowing date; yield; PLANTING DATE; RISING TEMPERATURE; CORN PRODUCTION; CROP PRODUCTION; TRENDS; GROWTH; PHENOLOGY; SYSTEMS; PRODUCTIVITY; MANAGEMENT;
D O I
10.1111/gcb.12324
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
Northeast China (NEC) accounts for about 30% of the nation's maize production in China. In the past three decades, maize yields in NEC have increased under changes in climate, cultivar selection and crop management. It is important to investigate the contribution of these changing factors to the historical yield increases to improve our understanding of how we can ensure increased yields in the future. In this study, we use phenology observations at six sites from 1981 to 2007 to detect trends in sowing dates and length of maize growing period, and then combine these observations with in situ temperature data to determine the trends of thermal time in the maize growing period, as a measure of changes in maize cultivars. The area in the vicinity of these six sites accounts for 30% of NEC's total maize production. The agricultural production systems simulator, APSIM-Maize model, was used to separate the impacts of changes in climate, sowing dates and thermal time requirements on maize phenology and yields. In NEC, sowing dates trended earlier in four of six sites and maturity dates trended later by 4-21days. Therefore, the period from sowing to maturity ranged from 2 to 38days longer in 2007 than it was in 1981. Our results indicate that climate trends alone would have led to a negative impact on maize. However, results from the adaptation assessments indicate that earlier sowing dates increased yields by up to 4%, and adoption of longer season cultivars caused a substantial increase in yield ranging from 13% to 38% over the past 27years. Therefore, earlier sowing dates and introduction of cultivars with higher thermal time requirements in NEC have overcome the negative effects of climate change and turned what would have otherwise been a loss into a significant increase in maize yield.
引用
收藏
页码:3481 / 3492
页数:12
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