The fertilization effect of global dimming on crop yields is not attributed to an improved light interception
The fertilization effect of global dimming on crop yields is not attributed to an improved light interception
复制标题
全球变暗对作物产量的施肥效应并非归因于光拦截的改善
DOI：
10.1111/gcb.14822
复制
发表时间：
2019-10
影响因子：
11.6
通讯作者：
Lee Xuhui
中科院分区：
文献类型：
--
作者：
Shao Liping;Li Gang;Zhao Qiannan;Li Yabing;Sun Yutong;Wang Weinan;Cai Chuang;Chen Weiping;Liu Ronghua;Luo Weihong;Yin Xinyou;Lee Xuhui
全球变暗是入射全球辐射的十年减少，通常伴随着散射辐射部分的增加，因此，全球变暗对作物生产的影响很难预测。量化这种影响的一种流行方法是对历史气候和作物数据进行统计分析，或使用动态作物模拟建模方法。在这里，我们表明，历史数据的统计分析并没有提供合理的值与直接辐射对水稻或小麦产量的影响的漫射辐射。与此相反，我们的田间试验研究3年表明，增加漫射辐射部分，这部分抵消了全球辐射减少造成的产量损失，在两种作物施肥效果。施肥效应不是由于增加了冠层的光截获而主要是由于增加了辐射利用效率。芸香的增加不仅解释了光合光响应曲线的饱和形状，但也通过植物适应调光，逐渐增加叶片氮浓度。作物收获指数在调光下略有下降，从而降低了施肥对作物产量的影响。这些结果挑战了现有的建模范式，该范式假设施肥对作物产量的影响主要归因于改善的光截获。进一步研究植物适应的生理机制，以更好地量化未来气候变化下全球变暗对农业生态系统生产力的影响。
Global dimming, a decadal decrease in incident global radiation, is often accompanied with an increase in the diffuse radiation fraction, and, therefore, the impact of global dimming on crop production is hard to predict. A popular approach to quantify this impact is the statistical analysis of historical climate and crop data, or use of dynamic crop simulation modelling approach. Here, we show that statistical analysis of historical data did not provide plausible values for the effect of diffuse radiation versus direct radiation on rice or wheat yield. In contrast, our field experimental study of 3 years demonstrated a fertilization effect of increased diffuse radiation fraction, which partly offset yield losses caused by decreased global radiation, in both crops. The fertilization effect was not attributed to any improved canopy light interception but mainly to the increased radiation use efficiency (RUE). The increased RUE was explained not only by the saturating shape of photosynthetic light response curves but also by plant acclimation to dimming that gradually increased leaf nitrogen concentration. Crop harvest index slightly decreased under dimming, thereby discounting the fertilization effect on crop yields. These results challenge existing modelling paradigms, which assume that the fertilization effect on crop yields is mainly attributed to an improved light interception. Further studies on the physiological mechanism of plant acclimation are required to better quantify the global dimming impact on agroecosystem productivity under future climate change.
登录
查看更多内容
DOI：
10.1007/978-94-011-0750-1
发表时间：
1994
期刊：
--
影响因子：
--
作者：
J. Goudriaan;H. H. Laar-H.
通讯作者：
J. Goudriaan;H. H. Laar-H.
影响因子：
5.2
作者：
G. Wohlfahrt;A. Hammerle;Alois Haslwanter;M. Bahn;U. Tappeiner;A. Cernusca
通讯作者：
G. Wohlfahrt;A. Hammerle;Alois Haslwanter;M. Bahn;U. Tappeiner;A. Cernusca
影响因子：
6.9
作者：
A. Wingler;S. Purdy;J. Maclean;Nathalie Pourtau
通讯作者：
A. Wingler;S. Purdy;J. Maclean;Nathalie Pourtau
DOI：
10.2134/1994.physiologyanddetermination.c34
发表时间：
1994
期刊：
--
影响因子：
--
作者：
K. Boote;M. Tollenaar
通讯作者：
K. Boote;M. Tollenaar
气溶胶对树木生长产生积极影响的现场证据
影响因子：
11.6
作者：
Wang Xin;Wu Jin;Chen Min;Xu Xiangtao;Wang Zhenhua;Wang Bin;Wang Chengzhang;Piao Shilong;Lin Weili;Miao Guofang;Deng Meifeng;Qiao Chunlian;Wang Jing;Xu Shan;Liu Lingli
通讯作者：
Liu Lingli