경남지역 논 토양 중금속 함량 변동조사

Monitoring of the heavy metals at paddy rice agriculture is very important for environmental agriculture. A study was carried out of heavy metal concentrations in 260 paddy soil samples every four years from 1999 to 2007 in Gyeongnam Province. Heavy metals such as Cd, Cr, Cu, Ni, Pb, Zn, and As in paddy soils were analyzed. Average concentrations of heavy metal were Cd 0.426 (ranged 0.003-1.379) mg kg -1 for Cd, 1.189 (0.003-3.264) mg kg -1 , for Cr, 9.68 (0.05-22.38) mg kg -1 for Cu, 2.64 (0.01-7.36) mg kg -1 for Ni, 23.7 (0.7-54.1) mg kg-1 for Pb, 20.8 (0.7-131.2) mg kg -1 for Zn, and 1.054 (0.001-2.110) mg kg -1 for As, respectively . Long-term changes of heavy metals were showed that Cd, Ni, and Zn were significantly increased whereas Cr, Cu, and As were significantly decreased. Principle component analysis (PCA) of heavy metals in paddy soils was obtained with eigenvalues > 1 summing 34.3% of variance for PC1, 17.5% of variance for PC2, and 51.8% of the total variance in soil heavy metals.