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南京农大 | 过去四十年中国小麦产量差巨大但正在缩小

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南京农大 | 过去四十年中国小麦产量差巨大但正在缩小

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文章信息

文章标题Multi-model estimation reveals substantial but decreasing wheat yield gaps in China during the last four decades

标题译文:多模型估算揭示过去四十年中国小麦产量差巨大但正在缩小

发表期刊European Journal of Agronomy

在线时间:2026.03.14

通讯作者刘蕾蕾 教授、朱艳 教授

通讯单位南京农业大学农学院

Oneline:利用四种作物模型组成的集合,分析了1981年至2020年中国主要冬麦区的产量潜力与实际产量,发现虽然存在巨大的增产空间(平均产量差距为57%),但由于气候变化导致潜力下降及实际产量提升,这一差距正逐渐缩小,且管理措施是影响产量稳定性的首要因素。

研究背景

      随着全球人口增长及耕地资源受限,提高现有耕地的单产和稳定性是保障粮食安全的关键。产量差距(潜在产量与实际产量之差)是评估增产潜力的核心指标,而多模型集合方法能有效降低单一模型的不确定性。尽管已有研究指出中国存在较大的小麦产量差距,但缺乏基于长时序(1981-2020)、多模型集合及全国尺度总产差距的综合评估。此外,单纯追求潜在产量可能带来环境代价,因此引入兼顾生态效益的“可实现产量”至关重要。文章旨在通过多模型集合方法,明确中国主产区不同层级产量的时空分布,评估总产提升潜力,并解析产量稳定性及其驱动因子,为制定区域适应性策略提供科学依据。

      研究选取了中国主要冬麦生产区(涵盖13个省份)作为研究区域,利用1981年至2020年间129个农业气象站的长期观测数据(包括气象、土壤、物候、品种及管理措施等),构建了由DSSAT-CERES-Wheat、DSSAT-Nwheat、WheatGrow和APSIM-Wheat四种作物模型组成的多模型集合,以模拟潜在产量(Yp)和水分限制产量(Yw);结合农业农村部专家制定的可实现产量(Yt)和统计的实际产量(Ya),计算了不同层级的产量差距及其时空分布特征;利用反距离加权法将站点数据插值至10km网格并结合种植面积估算总产提升潜力;最后,通过随机森林(Random Forest)模型量化了气候、土壤及管理措施(如施肥、灌溉有效性、农机动力)对产量稳定性及产量差距的相对贡献率。

主要结果

产量空间分布: 实际产量(Ya)、可实现产量(Yt)和潜在产量(Yp)呈现“北高南低”特征,其中黄淮海亚区(HHS)最高(Ya为4.5 t/ha,Yp为10.2 t/ha);而水分限制产量(Yw)则“南高北低”,长江中下游亚区(MYS)最高(6.1 t/ha)。
时间趋势: 1981-2020年间,实际产量显著增加,全区平均增速为0.61 t/ha/十年(HHS最快,达0.84 t/ha/十年);潜在产量在北部微增或不显著,但在南部显著下降(MYS降幅最大,为0.18 t/ha/十年)。
产量差距: 潜在产量与实际产量的平均绝对差距为5.3 t/ha,相对差距(RYgp-a)平均为57%;潜在产量与水分限制产量的相对差距为40%;可实现产量与实际产量的相对差距为46%。北方地区的产量差距普遍大于南方。
差距变化趋势: 潜在产量与实际产量的差距呈显著缩小趋势,全区平均减少速率为-0.72 t/ha/十年(HHS最快,为-0.82 t/ha/十年)。
总产提升潜力: 若将实际产量提升至潜在产量水平,中国小麦总产可增加约1.18亿吨(接近当前总产1.35亿吨);若提升至可实现产量水平,可增加7200万吨;若消除水分限制(Yw至Yp),可增加8900万吨
稳定性与驱动因子: 超过半数站点(64%)产量不稳定,主要集中在黄淮海亚区(92%的站点不稳定)。随机森林分析显示,管理措施(农机动力、灌溉有效性、施肥量)是影响产量稳定性和差距的首要因素,其次才是土壤和气候因子。

文章图表

图 1: 中国研究区域及小麦种植面积(a),市级尺度编制的可实现产量及农业气象站点分布(b)。(a) 不同颜色表示像素内小麦种植面积的大小,每个像素为5弧分网格单元。NS:北部亚区;HHS:黄淮海亚区;MYS:长江中下游亚区;SWS:西南亚区。(b) 红线表示中国冬小麦生产的四个主要亚区,彩色块表示市级的可实现产量。黑点表示129个农业气象站点的位置。

图 2: 1981-2020年间平均观测实际产量(Ya) (a)、设计可实现产量(Yt) (b)、模拟水分限制产量(Yw) (c) 和模拟潜在产量(Yp) (d) 的空间变异。模拟的水分限制产量和潜在产量为四种作物模型(DSSAT-CERES-Wheat, DSSAT-Nwheat, WheatGrow, 和 APSIM-Wheat)的平均模拟值。

图 3: 1981-2020年间Yp与Ya之间(a)、Yp与Yw之间(b) 以及Yt与Ya之间(c) 的平均产量差距的空间变异。

图 4: 1981年至2020年四个亚区的年产量差距。黑线为线性回归线。在每个箱线图中,从下到上的横线分别代表该亚区站点产量的第5百分位、第25百分位、中位数、第75百分位和第95百分位。

图 5: 1981-2020年间,若实际产量达到潜在产量、实际产量达到可实现产量、以及水分限制产量达到潜在产量时,四个亚区估计的小麦总产提升量。此处未考虑过去40年小麦种植面积的变化。误差线表示四个模型估算的额外产量的标准误。

图 6: 129个站点的小麦产量稳定性及差距分类(a),以及产量稳定且差距大(b)、产量稳定且差距小(c) 和产量不稳定(d) 的前10个影响因子的排序。“不稳定”产量指过去40年中实际产量的标准差大于0.75(未去除技术趋势)。若产量差距大于过去40年全区的平均值,则被归类为“大”差距。AMP:农机动力,EI:灌溉有效性,FA:施肥量,VPrad:营养生长期累积生长季辐射,STN:土壤全氮浓度,SPH:土壤pH值,SOC:土壤有机碳含量,VPTmean:营养生长期平均生长季温度,RPday:生殖期天数,SBD:土壤容重,WPrad:全生长季累积生长季辐射,WPpre:全生长季累积生长季降水,WPTmean:全生长季平均生长季温度。

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  1. CONNECT:[ UseTime:0.000967s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001509s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000679s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000699s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001303s ]
  6. SELECT * FROM `set` [ RunTime:0.000508s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001394s ]
  8. SELECT * FROM `article` WHERE `id` = 514250 LIMIT 1 [ RunTime:0.004747s ]
  9. UPDATE `article` SET `lasttime` = 1774417035 WHERE `id` = 514250 [ RunTime:0.006310s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000624s ]
  11. SELECT * FROM `article` WHERE `id` < 514250 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001199s ]
  12. SELECT * FROM `article` WHERE `id` > 514250 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002584s ]
  13. SELECT * FROM `article` WHERE `id` < 514250 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.038422s ]
  14. SELECT * FROM `article` WHERE `id` < 514250 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014762s ]
  15. SELECT * FROM `article` WHERE `id` < 514250 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006245s ]
0.179099s