气候变化领域集成服务门户(CCPortal): Global-scale patterns and determinants of cropping frequency in irrigation dam command areas

CCPortal

DOI	10.1016/j.gloenvcha.2018.02.011
	Global-scale patterns and determinants of cropping frequency in irrigation dam command areas
	Rufin P.; Levers C.; Baumann M.; Jägermeyr J.; Krueger T.; Kuemmerle T.; Hostert P.
发表日期	2018
ISSN	0959-3780
起始页码	110
结束页码	122
卷号	50
英文摘要	A growing human population and shifting consumption patterns increase the pressure on agricultural production systems. Reservoir-based irrigation has boosted agricultural production through higher cropping frequencies, whereas the magnitude of this effect varies significantly across the globe. Technological, biophysical and socio-economic constraints often limit cropping frequency in the command areas of irrigation dams, yet the relationships with these factors remain poorly understood at the global scale. Here, we first determined the size and location of 1288 command areas of irrigation dams commissioned since 1985. Within these areas, we studied cropping frequency during the period of 2001–2012 using a global time series of land cover information. We further investigated potential biophysical, socio-economic and technological constraints for intensive cropping using a Boosted Regression Trees modeling framework. Our results showed that the largest extent of reservoir-irrigated croplands are located in India (5.9 Mha), Indonesia (1.5 Mha), China (1.4 Mha), Vietnam (0.9 Mha), Turkey (0.7 Mha), Iran (0.7 Mha), and Thailand (0.6 Mha). Globally, cropping frequencies in irrigation dam command areas were on average 16% higher compared to rainfed control areas, yet pronounced differences in the strength and direction of this effect were apparent across world regions. Technological properties of dams and irrigation systems were amongst the most important variables for explaining global-scale variation in cropping frequency. Specifically, we observed low cropping frequencies in smaller command areas (<10,000 ha) and under long distance water allocation (>20 km). The command areas of small reservoirs (storage capacity < 7.9 Mm³) showed similar cropping frequencies compared to large reservoirs, yet with increased tolerance toward biophysical constraints. Our findings thus support arguments for future emphasis on de-centralized water storage facilities in order to reduce water losses and to improve access to irrigation water and infrastructure, thereby contributing to better meeting future agricultural production targets. © 2018 Elsevier Ltd
英文关键词	Boosted regression trees; Cropping frequency; Fallow land; Land use intensity; Surface irrigation; Water storage infrastructure
学科领域	agricultural land; agricultural production; cropping practice; global perspective; irrigation system; land cover; land use change; reservoir; water storage; yield response; India; Indonesia
语种	英语
scopus关键词	agricultural land; agricultural production; cropping practice; global perspective; irrigation system; land cover; land use change; reservoir; water storage; yield response; India; Indonesia
来源期刊	Global Environmental change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/117145
作者单位	Geography Department, Humboldt-Universität zu Berlin, Unter den Linden 6, Berlin, 10099, Germany; Integrative Research Institute on Transformations of Human Environment Systems (IRI THESys), Humboldt-Universität zu Berlin, Unter den Linden 6, Berlin, 10099, Germany; Research Domain Earth System Analysis, Potsdam Institute for Climate Impact Research (PIK), Telegrafenberg A62, Potsdam, 14473, Germany
推荐引用方式 GB/T 7714	Rufin P.,Levers C.,Baumann M.,et al. Global-scale patterns and determinants of cropping frequency in irrigation dam command areas[J],2018,50.
APA	Rufin P..,Levers C..,Baumann M..,Jägermeyr J..,Krueger T..,...&Hostert P..(2018).Global-scale patterns and determinants of cropping frequency in irrigation dam command areas.Global Environmental change,50.
MLA	Rufin P.,et al."Global-scale patterns and determinants of cropping frequency in irrigation dam command areas".Global Environmental change 50(2018).