Rice cropping density and intensity lessened in southeast China during the twenty-first century

Bingwen Qiu, Wen Qi, Zhenghong Tang, Chongcheng Chen, Xiaoqin Wang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Accurate and updated time series maps of paddy rice distribution and planting intensity will greatly improve our knowledge. Unfortunately, spatiotemporal explicit information on rice fields is relatively limited, and considerable uncertainties still exist as regards to its inter-annual variations in China. In this study, an improved rice mapping methodology was proposed through combined consideration of vegetation phenology and surface moisture variations from different seasonal rice. This method was applied to southeast China based on 500 m 8 day composite Moderate Resolution Imaging Spectroradiometer (MODIS) Enhance Vegetation Indices with two bands (EVI2) during the period 2001–2013. Its efficiency was validated with 763 ground survey sites, with an overall accuracy of 95.02 % and the kappa index of 0.9217. Spatiotemporal analysis indicated that rice cropping density and intensity lessened in southeast China during the period 2001–2013. Particularly, the paddy rice-planted areas reduced by 30.09 %, changing from 231,005 to 161,484 km2. Among them, the planted areas of double rice decreased by 49.34 %, changing from 34,215 to 17,335 km2. Therefore, averaged rice cropping intensity in southeast China decreased from 1.148 to 1.107. The primary dynamic patterns were from single rice or a rotation of rice plus other crops to non-rice (93,386 km2) and double rice to non-double rice (24,132 km2). When analyzed at provincial and altitudinal gradient levels, it was obvious that areas with greater rice cropping density or intensity were associated with more remarkable reductions. [Figure not available: see fulltext.]

Original languageEnglish (US)
Article number5
Pages (from-to)1-12
Number of pages12
JournalEnvironmental Monitoring and Assessment
Volume188
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • MODIS EVI2
  • Rice cropping density
  • Rice cropping intensity
  • Southeast China
  • Spatiotemporal variations

ASJC Scopus subject areas

  • Environmental Science(all)
  • Pollution
  • Management, Monitoring, Policy and Law

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