DOI: 10.1073/pnas.2011702117
论文题名: The scale dependency of spatial crop species diversity and its relation to temporal diversity
作者: Merlos F.A. ; Hijmans R.J.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期: 42 起始页码: 26176
结束页码: 26182
语种: 英语
英文关键词: Agrobiodiversity
; Crop rotation
; Spatial scale
; Temporal diversity
Scopus关键词: agricultural land
; article
; crop rotation
; maize
; nonhuman
; soybean
; species diversity
; United States
; wheat
; agriculture
; biodiversity
; classification
; crop
; ecosystem
; growth, development and aging
; procedures
; spatiotemporal analysis
; species difference
; Agriculture
; Biodiversity
; Crops, Agricultural
; Ecosystem
; Spatio-Temporal Analysis
; Species Specificity
; United States
英文摘要: Increasing crop species diversity can enhance agricultural sustainability, but the scale dependency of the processes that shape diversity and of the effects of diversity on agroecosystems is insufficiently understood. We used 30 m spatial resolution crop classification data for the conterminous United States to analyze spatial and temporal crop species diversity and their relationship. We found that the US average temporal (crop rotation) diversity is 2.1 effective number of species and that a crop's average temporal diversity is lowest for common crops. Spatial diversity monotonically increases with the size of the unit of observation, and it is most strongly associated with temporal diversity when measured for areas of 100 to 400 ha, which is the typical US farm size. The association between diversity in space and time weakens as data are aggregated over larger areas because of the increasing diversity among farms, but at intermediate aggregation levels (counties) it is possible to estimate temporal diversity and farm-scale spatial diversity from aggregated spatial crop diversity data if the effect of beta diversity is considered. For larger areas, the diversity among farms is usually much greater than the diversity within them, and this needs to be considered when analyzing large-area crop diversity data. US agriculture is dominated by a few major annual crops (maize, soybean, wheat) that are mostly grown on fields with a very low temporal diversity. To increase crop species diversity, currently minor crops would have to increase in area at the expense of these major crops. © 2020 National Academy of Sciences. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163987
Appears in Collections: 气候变化与战略
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作者单位: Merlos, F.A., Department of Environmental Science and Policy, University of California, Davis, CA 95616, United States, Instituto Nacional de Tecnología Agropecuaria, Unidad Integrada Balcarce, Balcarce, Buenos Aires, 7620, Argentina; Hijmans, R.J., Department of Environmental Science and Policy, University of California, Davis, CA 95616, United States
Recommended Citation:
Merlos F.A.,Hijmans R.J.. The scale dependency of spatial crop species diversity and its relation to temporal diversity[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(42)