| 引用本文: | 曹 言,王 杰,李尤亮,等.基于作物水分亏缺指数的云南省夏玉米不同生育期干旱时空特征分析[J].灌溉排水学报,2019,38(8):97-106. |
| ,et al.基于作物水分亏缺指数的云南省夏玉米不同生育期干旱时空特征分析[J].灌溉排水学报,2019,38(8):97-106. |
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| 摘要: |
| 【目的】研究云南省夏玉米不同生育期干旱变化规律，为该区夏玉米合理布局和防御生育期内阶段性干旱提供科学依据。【方法】利用云南省1960—2014年32个典型气象站点逐日气象资料，计算夏玉米生育期逐旬作物水分亏缺指数（crop water deficit index，CWDI），采用线性趋势和M-K检验分析了云南省不同地区夏玉米干旱的时空变化特征，并探究了CWDI与夏玉米产量的关系。【结果】①云南省夏玉米初始生长期、快速生长期、生长中期、生长后期和全生育期平均干旱站次比分别为50.30%、12.36%、5.88%、6.00%和10.35%。②1960—2014年夏玉米初始生长期干旱站次比和CWDI均呈减小趋势，快速生长期、生长中期、生长后期和全生育期则均呈上升趋势，且快速生长期和生长中期干旱面积和强度上升幅度相对较大，上升趋势主要集中在滇西南。③云南省夏玉米各生育阶段不同等级干旱发生频率整体上表现出中部高四周低的分布特征，其中滇中干旱频率最高，滇西南最低；云南省夏玉米各生长阶段干旱强度上升幅度较大区域主要集中在滇西南和滇东北，上升幅度较小区域主要集中在滇中中西部和滇西北。④云南省夏玉米生长中期水分供需状况对夏玉米产量影响较大。【结论】一定幅度的干旱强度上升，有利于云南省西部夏玉米增产，尤其是滇西南地区；但会导致中东部夏玉米减产，尤其是滇东北。 |
| 关键词: 夏玉米； 作物水分亏缺指数；生育期； 干旱特征； 云南省 |
| DOI：10.13522/j.cnki.ggps.20190041 |
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| The Spatial and Temporal Characteristics of Drought During Summer Maize at Different Growth Stages in Yunnan Province Based on Crop Water Deficit Index |
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CAO Yan, WANG Jie, LI Youliang, WANG Shupeng, QI Na
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Yunnan Institute of Water Resources and Hydropower Research, Kunming 650228, China
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| Abstract: |
| 【Objective】In order to provide scientific basis for the rational distribution of summer Maize and the prevention of drought during the growth stages, the variation of drought in different growth stages of summer Maize in Yunnan province was studied. 【Method】 Based on the daily meteorological data from 1960 to 2014 of 32 typical?meteorological stations in Yunnan province, crop water drought Index (CWDI) in every ten days of summer maize growth stages were calculated, the temporal and spatial variation of summer Maize drought in different regions of Yunnan province were analyzed by the linear trend estimate and M-K method, and the correlation coefficient of CWDI at different stages and summer maize yield was researched. 【Result】①The ratios of drought occurring stations for summer maize during the initial stage, crop development stage, mid-season stage, late season stage and whole growing season were 50.30%, 12.36%, 5.88%, 6.00% and 10.35%, respectively. ②The ratios of drought occurring stations and CWDI of summer maize during the initial stage exhibited a declining trend; However, the ratios of drought occurring stations and CWDI of summer Maize during the crop development stage, mid-season stage, late season stage and whole growing season showed an increasing trend, and the increasing amplitude of the drought occurring stations and the strength (CWDI)?was?relatively large in the crop development stage and mid-season stage, the increasing trend was mainly concentrated in southwest Yunnan.③The drought frequency basically showed that the characteristics of the spatial distribution from the middle to the surrounding was more and more?higher during the different stages of summer maize in Yunnan province, the highest of drought frequency were concentrated in central Yunnan, and the lowest in southwest Yunnan; The areas with great increase of drought strength was mainly concentrated in the southwest and northeast Yunnan during different stages of summer maize, and the areas with less increase of drought strength was mainly concentrated in the western and northwest Yunnan.④The condition of water supply and demand in the mid-season stage of summer maize affect summer maize yield greatly in Yunnan province.【Conclusion】The drought strength increasing is favorable to the yield of summer maize in western Yunnan province, especially in southwest Yunnan; while the drought strength increasing has a passive effect on the yield of summer maize in the central and eastern Yunnan province, especially in northeast Yunnan. |
| Key words: summer maize; CWDI; growth stage ; drought characteristics; Yunnan province |
