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DOI	10.1016/j.eja.2018.11.001
	Effects of input data aggregation on simulated crop yields in temperate and Mediterranean climates
	Maharjan, Ganga Ram 1; Hoffmann, Holger 1; Webber, Heidi 1,9; Srivastava, Amit Kumar 1; Weihermueller, Lutz 2; Villa, Ana 3; Coucheney, Elsa 3; Lewan, Elisabet 3; Trombi, Giacomo 4; Moriondo, Marco 5; Bindi, Marco 4; Grosz, Balazs 6; Dechow, Rene 6; Kuhnert, Mathias 7; Doro, Luca 8,12; Kersebaum, Kurt-Christian 9; Stella, Tommaso 9; Specka, Xenia 9; Nendel, Claas 9; Constantin, Julie 10; Raynal, Helene 11; Ewert, Frank 1,9; Gaiser, Thomas 1
通讯作者	Maharjan, Ganga Ram
来源期刊	EUROPEAN JOURNAL OF AGRONOMY
ISSN	1161-0301
EISSN	1873-7331
出版年	2019
卷号	103 页码:32-46
英文摘要	Soil-crop models are used to simulate ecological processes from the field to the regional scale. Main inputs are soil and climate data in order to simulate model response variables such as crop yield. We investigate the effect of changing the resolution of input data on simulated crop yields at a regional scale using up to ten dynamic crop models. For these models we compared the effects of spatial input data aggregation for wheat and maize yield of two regions with contrasting climate conditions (1) Tuscany (Italy, Mediterranean climate) and (2) North Rhine Westphalia (NRW, Germany, temperate climate). Soil and climate data of 1 km resolution were aggregated to resolutions of 10, 25, 50, and 100 km by selecting the dominant soil class (and corresponding soil properties) and by arithmetic averaging, respectively. Differences in yield simulated at coarser resolutions from the yields simulated at 1 km resolution were calculated to quantify the effect of the aggregation of the input data (soil and climate data) on simulation results. The mean yield difference (bias) at the regional level was positive due to the upscaling of productive dominant soil(s) to coarser resolution. In both regions and for both crops, aggregation effects (i.e. errors in simulation of crop yields at coarser spatial resolution) due to the combined aggregation of soil and climate input data increased with decreasing resolution, whereby the aggregation error for Tuscany was larger than for North Rhine Westphalia (NRW). The average absolute percentage yield differences between grid cell yields at the coarsest resolution (100 km) compared to the finest resolution (1 km) were by about 20-30% for Tuscany and less than 15 and 20% for NRW for winter wheat and silage maize, respectively. In the Mediterranean area, the prediction errors of the simulated yields could reach up to 60% when looking at individual crop model simulations. Additionally, aggregating soil data caused larger aggregation errors in both regions than aggregating climate data. Those results suggest that a higher spatial resolution of climate and especially of soil input data are necessary in Mediterranean areas than in temperate humid regions of central Europe in order to predict reliable regional yield estimations with crop models. For generalization of these outcomes, further investigations in other sub humid or semi-arid regions will be necessary.
英文关键词	Data resolution Scale Modelling Regional yield Climate Soil
类型	Article
语种	英语
国家	Germany ; Sweden ; Italy ; Scotland ; France ; USA
开放获取类型	Green Published, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000456753000004
WOS关键词	MODEL USE ; CALIBRATION ; CARBON ; VALIDATION ; WHEAT ; PARAMETERIZATION ; FINGERPRINTS ; IMPACT ; GROWTH ; MONICA
WOS类目	Agronomy
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215579
作者单位	1.Univ Bonn, INRES, Crop Sci Grp, Bonn, Germany; 2.Forschungszentrum Julich, Agrosphere Inst IBG 3, Julich, Germany; 3.Swedish Univ Agr Sci, Dept Soil & Environm, Uppsala, Sweden; 4.Univ Florence, Dept Agri Food Prod & Environm Sci DISPAA, Florence, Italy; 5.CNR Ibimet, Florence, Italy; 6.Thunen Inst Climate Smart Agr, Braunschweig, Germany; 7.Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen, Scotland; 8.Univ Sassari, Desertificat Res Ctr, Viale Italia, Sassari, Italy; 9.Leibniz Ctr Agr Landscape Res ZALF, Muncheberg, Germany; 10.Univ Toulouse, INRA, AGIR, Castanet Tolosan, France; 11.Univ Toulouse, INRA, MIAT, Castanet Tolosan, France; 12.Texas A&M AgriLife Res Blackland Res & Extens Ctr, Temple, TX USA
推荐引用方式 GB/T 7714	Maharjan, Ganga Ram,Hoffmann, Holger,Webber, Heidi,et al. Effects of input data aggregation on simulated crop yields in temperate and Mediterranean climates[J],2019,103:32-46.
APA	Maharjan, Ganga Ram.,Hoffmann, Holger.,Webber, Heidi.,Srivastava, Amit Kumar.,Weihermueller, Lutz.,...&Gaiser, Thomas.(2019).Effects of input data aggregation on simulated crop yields in temperate and Mediterranean climates.EUROPEAN JOURNAL OF AGRONOMY,103,32-46.
MLA	Maharjan, Ganga Ram,et al."Effects of input data aggregation on simulated crop yields in temperate and Mediterranean climates".EUROPEAN JOURNAL OF AGRONOMY 103(2019):32-46.