Monitoring of spatiotemporal dynamics of Rabi rice fallows in South Asia using remote sensing. In: Geospatial Technologies in Land Resources, Mapping, Monitoring and Management, Geotechnologies and the Environment
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Murali Krishna Gumma, Prasad Thenkabail, Pardhasaradhi Telguntla, Anthony Whitbread. (12/9/2018). Monitoring of spatiotemporal dynamics of Rabi rice fallows in South Asia using remote sensing. In: Geospatial Technologies in Land Resources, Mapping, Monitoring and Management, Geotechnologies and the Environment, in "Geospatial Technologies in Land Resources Mapping, Monitoring and Management". Germany: springer international publishing.
Abstract
Cereals and grain legumes are the most important part of human diet and
nutrition. The expansion of grain legumes with improved productivity to cater the
growing population’s nutritional security is of prime importance and need of the hour.
Rice fallows are best niche areas with residual moisture to grow short-duration
legumes, thereby achieving intensification. Identifying suitable areas for grain legumes
and cereal grains is important in this region. In this context, the goal of this study was
to map fallow lands followed by rainy season (kharif) rice cultivation or post-rainy
(rabi) fallows in rice-growing environments between 2005 and 2015 using temporal
moderate-resolution imaging spectroradiometer (MODIS) data applying spectral
matching techniques. This study was conducted in South Asia where different rice
ecosystems exist. MODIS 16 day normalized difference vegetation index (NDVI) at
250 m spatial resolution and season-wise-intensive ground survey data were used to
map rice systems and the fallows thereafter (rabi fallows) in South Asia. The rice maps
were validated with independent ground survey data and compared with available
subnational-level statistics. Overall accuracy and kappa coefficient estimated for rice
classes were 81.5% and 0.79%, respectively, with ground survey data. The derived
physical rice area and irrigated areas were highly correlated with the subnational
statistics with R2 values of 94% at the district level for the years 2005–2006 and
2015–2016. Results clearly show that rice fallow areas increased from 2005 to 2015.
The results show spatial distribution of rice fallows in South Asia, which are identified
as target domains for sustainable intensification of short-duration grain legumes, fixing
the soil nitrogen and increasing incomes of small-holder farmers.
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Whitbread, Anthony https://orcid.org/0000-0003-4840-7670