Effects of Cultivar Shifts on Winter Wheat Phenology Under Two Parameterization Methods
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摘要: 利用华北平原47个农业气象观测站1986—2010年冬小麦的品种、发育期观测资料和同期气象数据,基于常用的发育期模型,对两种参数化方案下品种变化对发育期影响的特征进行研究。其中参数化方案1采用固定的三基点温度,参数化方案2通过循环优化得到三基点温度。结果表明:在华北平原冬小麦品种变化频繁的情况下,两种参数化方案均能较好地对返青-抽穗期与抽穗-成熟期的模拟过程进行参数化;两种参数化方案均认为品种变化使返青-抽穗期和抽穗-成熟期日数有延长趋势,但不同参数化方案的趋势值存在较大差异,且参数化方案1模拟的趋势值总是高于参数化方案2。此外,不同的参数化方案也会使模拟的趋势值在区域上的分布规律发生变化。研究表明:不同参数化方案的使用会对模拟结果产生明显影响,因此,在量化品种变化对发育期影响时,需关注不同参数化方案对结果的影响,以及由此带来的不确定性。Abstract: Phenology and growth duration of crops have been significantly changed by the combined effects of climate change and cultivar shifts. For the need of accurately evaluating the response of crops phenology to future climate changes, effects of cultivar shift on phenology and its quantitative simulation has become a research hotspot. However, most recent studies are based on the single parameterization method, with less attention paid to effects of different parameterization methods, leading to a certain degree of assessment uncertainty.Winter wheat phenology data and daily meteorological data in 47 agrometeorological observation stations in North China Plain during 1986-2010 are collected. Based on these datasets, a most commonly used phenology model is used to quantize effects of cultivar shifts on phenology, and effects of two parameterization methods on simulated results are also analyzed. The first method uses fixed three cardinal temperatures (Method 1), while in the second method (Method 2) three cardinal temperatures are obtained by minimizing the root mean square error of simulated phenology.Results show that winter wheat critical phenology in North China Plain changes significantly under the frequently change of cultivar during study period. Both two methods perform well in parameterizing the simulation of durations from turning green to heading and from heading to maturity in the winter wheat simulation. The growth duration is prolonged by cultivar shift in the duration from turning green to heading and the duration from heading to maturity, though values given by Method 1 are higher. Both methods indicate effects of cultivar shifts on the duration from heading to maturity is higher than those on the duration from turning green to heading. In addition, the range of simulated trends and their regional distribution are also affected by the different parameterization method used. Among them, the difference of simulation results between two methods in the duration from turning green to heading is higher than the duration from heading to maturity. In the regional distribution, the difference of simulation results between two methods is bigger in the duration from heading to maturity. It verifies that simulation results are potentially affected by parameterization method. Therefore, the selection of parameterization methods and uncertainties introduced by different methods should be carefully considered.
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Key words:
- cultivar shifts;
- phenology;
- parameterization method;
- uncertainty
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图 5 1986—2010年华北平原冬小麦抽穗期日期(a), 成熟期日期(b), 返青-抽穗期日数(c), 抽穗-成熟期日数(d)观测值和两种参数化方案下模拟值的区域平均值及变化趋势
(、和分别为实测值、参数化方案1和参数化方案2模拟值; 、和分别为实测值、参数化方案1和参数化方案2模拟值随时间变化趋势; *表示达到0.01显著性水平)
Fig. 5 Regional mean and trends of observed and simulated heading date(a), maturity date(b), length of turning green to heading(c), heading to maturity(d) of winter wheat in North China Plain under two methods from 1986 to 2010
(, and indicate observed and simulated value of Method 1 and Method 2; , and indicate trends of observed and simulated value of Method 1 and Method 2; *denotes passing the test of 0.01 level)
图 6 两种参数化方案下1986—2010年冬小麦模拟误差的时间趋势的空间分布
(a)参数化方案1,返青-抽穗期,(b)参数化方案1,抽穗-成熟期,(c)参数化方案2,返青-抽穗期,(d)参数化方案2,抽穗-成熟期
Fig. 6 Spatial distribution of trends of winter wheat simulated error from 1986 to 2010 under two methods
(a)Method 1, turning green to heading, (b)Method 1, heading to maturity, (c)Method 2, turning green to heading, (d)Method 2, heading to maturity
表 1 两种参数化方案对不同发育阶段模拟结果的比较
Table 1 Comparisons of simulated results of different development stage under two methods
发育阶段 参数化方案 相对误差范围/% 平均绝对偏差/d 均方根误差/d 返青-抽穗期 1 -5.10~7.27 2.11 2.69 2 -4.24~5.31 1.48 2.04 抽穗-成熟期 1 -3.12~4.37 1.89 2.41 2 -2.48~3.12 0.79 1.24 表 2 1986—2010年华北平原冬小麦主要发育期随时间的变化趋势
Table 2 Trends of major winter wheat phenologies over year in North China Plain from 1986 to 2010
发育阶段 负趋势占比/% 显著负趋势占比/% 正趋势占比/% 显著正趋势占比/% 平均趋势/(d/(10 a)) 返青期 46.81 6.38* 53.19 8.51* 0.33 抽穗期 95.74 59.57* 4.26 0.00* -3.13 成熟期 82.98 34.04* 17.02 2.13* -1.45 返青-抽穗期 89.36 44.68* 10.64 2.13* -3.46 抽穗-成熟期 17.02 0.00* 82.98 51.06* 1.68 注:*表示达到0.05显著性水平。 表 3 两种参数化方案下品种变化对不同发育阶段日数的影响
Table 3 Effect of cultivar shifts on the length of different stages in simulation under two methods
参数化方案 返青-抽穗期 抽穗-成熟期 总影响/(d/(10 a)) 影响值/(d/(10 a)) 影响占比/% 影响值/(d/(10 a)) 影响占比/% 1 1.02* 34.8 1.91** 65.2 2.93 2 0.68 28.2 1.73** 71.8 2.41 注:**,*分别表示达到0.01和0.05显著性水平。 -
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