Automatic mapping afforestation, cropland reclamation and variations in cropping intensity in central east China during 2001–2016

Bingwen Qiu, Fengli Zou, Chongchen Chen, Zhenghong Tang, Jiangping Zhong, Xiongfei Yan

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Accurate and automatic monitoring and assessment of vegetation changes are important to support food security, ecosystem balance and global climate regulation. Compared with urbanization and deforestation, vegetation changes such as afforestation, cropland reclamation and variations in cropping intensity were understudied. This study aimed to propose an Automatic Method for detecting Multiple vegetation Changes (AMMC) through a knowledge-based strategy. Five temporal indices were proposed in order to fully characterize different vegetation types from four aspects: vegetation abundance, temporal dispersion, primary/minor temporal continuity, and growing season length. The AMMC takes advantage of the knowledge on the expected temporal trajectories of vegetation dynamics, which could be tracked based on their corresponding trends in these temporal indices. The efficiency of the proposed AMMC method was verified with its applications in central east China using 500 m 8 day composite MODIS datasets from 2001 to 2016. An overall accuracy of 94.75% was achieved when evaluated with 3,011 reference sites. Results revealed that there were totally 7,180 km 2 , 3,610 km 2 and 3,280.5 km 2 areas of afforestation, cropland reclamation and variations in cropping intensity in central east China, respectively. This study verified that afforestation efforts were succeeded, but “Grain for Green” project was not as expected since more cropland was reclamation implemented at less favorable biophysical conditions than cropland retirement.

Original languageEnglish (US)
Pages (from-to)490-502
Number of pages13
JournalEcological Indicators
Volume91
DOIs
StatePublished - Aug 2018

Fingerprint

afforestation
cropping practice
vegetation
China
retirement
vegetation dynamics
food security
moderate resolution imaging spectroradiometer
vegetation type
deforestation
MODIS
cropland
Vegetation
Afforestation
global climate
methodology
urbanization
vegetation types
growing season
trajectories

Keywords

  • Change detection
  • Dynamic trend
  • Temporal indices
  • Time series
  • Vegetation change

ASJC Scopus subject areas

  • Decision Sciences(all)
  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Automatic mapping afforestation, cropland reclamation and variations in cropping intensity in central east China during 2001–2016. / Qiu, Bingwen; Zou, Fengli; Chen, Chongchen; Tang, Zhenghong; Zhong, Jiangping; Yan, Xiongfei.

In: Ecological Indicators, Vol. 91, 08.2018, p. 490-502.

Research output: Contribution to journalArticle

Qiu, Bingwen ; Zou, Fengli ; Chen, Chongchen ; Tang, Zhenghong ; Zhong, Jiangping ; Yan, Xiongfei. / Automatic mapping afforestation, cropland reclamation and variations in cropping intensity in central east China during 2001–2016. In: Ecological Indicators. 2018 ; Vol. 91. pp. 490-502.
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