Diverse sensitivity of winter crops over the growing season to climate and land surface temperature across the rainfed cropland-belt of eastern Australia

Shen, J; Huete, A; Tran, NN; Devadas, R; Ma, X; Eamus, D; Yu, Q

Diverse sensitivity of winter crops over the growing season to climate and land surface temperature across the rainfed cropland-belt of eastern Australia

Shen, J

Huete, A

Tran, NN Devadas, R

Ma, X

Eamus, D

Yu, Q

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Publication Type:: Journal Article
Citation:: Agriculture, Ecosystems and Environment, 2018, 254 pp. 99 - 110
Issue Date:: 2018-02-15

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Field	Value	Language
dc.contributor.author	Shen, J https://orcid.org/0000-0002-7208-3314	en_US
dc.contributor.author	Huete, A https://orcid.org/0000-0003-2809-2376	en_US
dc.contributor.author	Tran, NN	en_US
dc.contributor.author	Devadas, R https://orcid.org/0000-0002-2085-6442	en_US
dc.contributor.author	Ma, X https://orcid.org/0000-0003-1499-8476	en_US
dc.contributor.author	Eamus, D https://orcid.org/0000-0003-2765-8040	en_US
dc.contributor.author	Yu, Q https://orcid.org/0000-0001-6950-1821	en_US
dc.date.available	2020-05-25T19:11:07Z
dc.date.issued	2018-02-15	en_US
dc.identifier.citation	Agriculture, Ecosystems and Environment, 2018, 254 pp. 99 - 110	en_US
dc.identifier.issn	0167-8809	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128631
dc.description.abstract	© 2017 Elsevier B.V. The rainfed cropland belt in Australia is of great importance to the world grain market but has the highest climate variability of all such regions globally. However, the spatial-temporal impacts of climate variability on crops during different crop growth stages across broadacre farming systems are largely unknown. This study aims to quantify the contributions of climate and Land Surface Temperature (LST) variations to the variability of the Enhanced Vegetation Index (EVI) by using remote sensing methods. The datasets were analyzed at an 8-day time-scale across the rainfed cropland of eastern Australia. First, we found that EVI values were more variable during the crop reproductive growth stages than at any other crop life stage within a calendar year, but nevertheless had the highest correlation with crop grain yield (t ha−1). Second, climate factors and LST during the crop reproductive growth stages showed the largest variability and followed a typical east-west gradient of rainfall and a north-south temperature gradient across the study area during the crop growing season. Last, we identified two critical 8-day periods, beginning on day of the year (DoY) 257 and 289, as the key ‘windows’ of crop growth variation that arose from the variability in climate and LST. Our results show that the sum of the variability of the climate components within these two 8-day ‘windows’ explained >88% of the variability in the EVI, with LST being the dominant factor. This study offers a fresh understanding of the spatial-temporal climate-crop relationships in rainfed cropland and can serve as an early warning system for agricultural adaptation in broadacre rainfed cropping practices in Australia and worldwide.	en_US
dc.relation.ispartof	Agriculture, Ecosystems and Environment	en_US
dc.relation.isbasedon	10.1016/j.agee.2017.11.023	en_US
dc.subject.classification	Agronomy & Agriculture	en_US
dc.title	Diverse sensitivity of winter crops over the growing season to climate and land surface temperature across the rainfed cropland-belt of eastern Australia	en_US
dc.type	Journal Article
utslib.citation.volume	254	en_US
utslib.for	0502 Environmental Science and Management	en_US
utslib.for	0703 Crop and Pasture Production	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	en_US
utslib.for	16 Studies in Human Society	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CAMGIS - Centre for Advanced Modelling and Geospatial lnformation Systems
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	254	en_US

Abstract:

© 2017 Elsevier B.V. The rainfed cropland belt in Australia is of great importance to the world grain market but has the highest climate variability of all such regions globally. However, the spatial-temporal impacts of climate variability on crops during different crop growth stages across broadacre farming systems are largely unknown. This study aims to quantify the contributions of climate and Land Surface Temperature (LST) variations to the variability of the Enhanced Vegetation Index (EVI) by using remote sensing methods. The datasets were analyzed at an 8-day time-scale across the rainfed cropland of eastern Australia. First, we found that EVI values were more variable during the crop reproductive growth stages than at any other crop life stage within a calendar year, but nevertheless had the highest correlation with crop grain yield (t ha−1). Second, climate factors and LST during the crop reproductive growth stages showed the largest variability and followed a typical east-west gradient of rainfall and a north-south temperature gradient across the study area during the crop growing season. Last, we identified two critical 8-day periods, beginning on day of the year (DoY) 257 and 289, as the key ‘windows’ of crop growth variation that arose from the variability in climate and LST. Our results show that the sum of the variability of the climate components within these two 8-day ‘windows’ explained >88% of the variability in the EVI, with LST being the dominant factor. This study offers a fresh understanding of the spatial-temporal climate-crop relationships in rainfed cropland and can serve as an early warning system for agricultural adaptation in broadacre rainfed cropping practices in Australia and worldwide.

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http://hdl.handle.net/10453/128631