Early-warning of Land Ecological Security in Hunan Province Based on RBF

  • 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;
    2. Department of Resources, Environment and Tourism Management, Hengyang Normal University, Hengyang 421008, Hunan, China

Received date: 2011-12-08

  Revised date: 2012-06-05

  Online published: 2012-10-20

Supported by

National Social Science Foundation of China, No.41071067; Graduate Student Research Innovation Project of 2011 in Hunan, No.CX2011B190; Construction Project of the Key Disciplines in Hunan, No.2011001


Based on the related data of land ecological security of Hunan Province from 1996 to 2010, this paper constructed a land ecological security early-warning index system for Hunan Province from three aspects which were pressure, state and response. And then it used the RBF model to make a prediction for land ecological security development trend of Hunan Province in 2011-2015, and at last made a warning analysis of the land ecological security of the province from 1996 to 2015 according to the early-warning index and warning degree standards. The results are shown as follows. (1) RBF model has a relatively high simulation accuracy, which can well fit the land ecological security system's development trends of Hunan Province in 2011-2015. (2) In terms of each subsystem's warning degree, the early-warning index of the pressure system showed an upward trend with fluctuations in 1996-2010, and the warning degree rose from light alarm to moderate alarm, the indicator light turned from blue lamp to yellow lamp gradually; the early-warning index will continue to rise from moderate alarm (yellow lamp) to heavy alarm (orange lamp) with fluctuations in 2011-2015. As for the state system, its early-warning index showed an upward trend with fluctuations in 1996-2010, although it remained in the moderate alarm (yellow lamp) state, alert should be maintained on the situation; in 2011-2015, the signs of serious deterioration will not occur because of the further effects and regulation of the response system, and it will remain at the level of 2008-2010. As for the response system, it showed a downward trend in 1996-2010, from which the state of huge alarm (red lamp) plummeted to no alarm (green lamp); its early-warning index will decline in 2011-2015 which will keep the state of green lamp and be increasingly close to the lower limit of the state of no alarm. (3) Overall, in 1996-2010, the land ecological security warning degree of Hunan Province showed a slight downward trend. In 2011-2015, its early-warning index will be about 0.42, and warning degree will keep in the state of moderate alarm (yellow lamp). (4) The main factors that influence the land ecological security of Hunan Province include the proportion of agricultural economy, the amount of farmland used for construction, the proportion of natural disaster-affected area, per capita area of construction land, the proportion of the tertiary industry, and the proportion of nature reserves. These are the focus of land ecological security regulation in the future.

Cite this article

XU Mei, ZHU Xiang, LIU Chunla . Early-warning of Land Ecological Security in Hunan Province Based on RBF[J]. Acta Geographica Sinica, 2012 , 67(10) : 1411 -1422 . DOI: 10.11821/xb201210011


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