Factors affecting the re-cultivation after the heavy metal decontamination treatment: Case study in Chang-hua in Taiwan
2015
Huang, W. (Kyoto University, Kyoto (Japan). C-PIER, CoHHO) | Hashimoto, S. | Hoshino, S. | Kuki, Y.
In Taiwan, decontamination of heavy-metal polluted land has been conducted since 2000 under the Soil Contamination Countermeasures Act. The large part of polluted-farmland has been decontaminated successfully. However, the recent study shed the light on the issue of fallow and abandoned farmland which experienced decontamination treatment. The objective of this study is to clarify the present land use of decontaminated farmland and to identify the geography factors affecting re-cultivation of farmland after the decontamination treatment. We took Chang-hua as a case study area, which is known to have the largest number and area of contaminated farmland. We conducted GIS and statistical analysis based on the field survey to identify the present use of farmland after the decontamination treatment and factors affecting the distribution of contaminated farmland and re-cultivation after the decontamination treatment. Our analyses clarified that 1) less number of decontaminated farmland sites have been re-cultivated, 2) farmland located in urbanized areas with heavily-polluted farmland in its vicinity tend to be fallowed or abandoned after the decontamination treatment, and in contrast, 3) farmland surrounded with paddy farmland tend to be re-cultivated after the decontamination.
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