| Autor: |
KATSUYUKI SHIMIZU, NAHO NOHARA, TADAO YAMAMOTO, TAKASHI KUME, CHULEEMAS BOONTHAI IWAI |
| Předmět: |
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| Zdroj: |
International Journal of Environmental & Rural Development; Jun2020, Vol. 11 Issue 1, p158-163, 5p |
| Abstrakt: |
The temporal and spatial distribution of soil apparent electrical conductivity (ECa) was measured to elucidate the process of soil salinization in rainfed paddy rice fields in Khon Kaen, Thailand. Soil ECa was measured in 2.3 ha of paddy fields using a ground conductivity meter, utilizing the principle of electromagnetic induction. The average soil ECa was measured at 150 cm and 75 cm depth at 10 m intervals. Observations were conducted every two weeks for two months, from mid-May 2018 to mid-July 2018. The collected data were interpolated using an inverse distance weighted method with 1 m intervals and then analyzed in terms of temporal and spatial distributions. The results showed that (1) higher soil ECa was observed in the northern part of the study area near a swamp throughout the monitoring period; (2) the average soil ECa at a depth of 0--75 cm ranged from 233 to 282 mS/m, while it ranged from 236 to 268 mS/m at a depth of 0--150 cm; (3) the average soil ECa in the upper layer was slightly higher than that of the lower layer in May, but this difference became smaller over time and the situation reversed in mid-July; and (4) a larger spatial distribution was observed in the upper layer compared with the lower layer based on the difference of a coefficient of variation of soil ECa. A soil salinization process was clearly observed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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