DIFFERENCES ANALYSIS ON PHYSICOCHEMICAL PROPERTITES,MICROBIAL AND ENZYME ACTIVITIES OF CADMIUM CONTAMINATED PADDY
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摘要: 通过田间试验,分析了萍乡市2 hm2 Cd污染稻田中土壤理化性质、微生物和酶活性的空间差异性及相关性特征。结果表明:糙米Cd变异系数大于土壤有效态Cd和总Cd,且晚稻变异性大于早稻,属于中等变异性。土壤pH和容重变异系数较小,有机质、阳离子交换量、速效钾、有效磷和碱解氮变异系数为22.82%~35.60%,属于中等变异性;除过氧化氢酶变异性较小外,土壤酶活性、机械组成和微团聚体变异系数为10.54%~38.21%,属于中等变异性;土壤微生物(52.59%~84.64%)变异性较强,表现为细菌 > 放线菌 > 真菌。相关性分析表明:土壤pH、砂粒、蔗糖酶、酸性磷酸酶和过氧化氢酶与土壤有机质、阳离子交换量、黏粒、有效磷、速效钾、真菌和脲酶具有较强的负相关;而土壤有机质、阳离子交换量、黏粒、有效磷、速效钾、真菌和脲酶之间具有较强的正相关。主成分分析发现:pH、有机质、容重、速效钾和碱解氮是土壤理化性质的关键因子。Abstract: A field experiment was conducted in 2 hm2 Cd contaminated paddy in Pingxiang, Jiangxi province, to study the spatial heterogeneity and correlation characteristics of soil physical and chemical properties, microbes and enzyme activities. The results showed that the variation coefficient of Cd in brown rice was larger than available Cd and total Cd in soil, and the variability of late rice was higher than that of early rice, which was with moderately variability. The coefficients of variation of pH and bulk density in soil was small, and the coefficients of variation of organic matter, cation exchange capacity, available potassium, available phosphorus and alkali nitrogen were in range of 22.82%~35.60%, with moderate variability. In addition to the variability of catalase was smaller, the variation coefficient of enzyme activity, mechanical composition and microaggregate in soil was 10.54%~38.21%, which was with moderate variability. The variability of microbes in soil was strong (in range of 52.59%~84.64%), in the sequence of bacteria > actinomycetes > fungi. Correlation analysis showed that pH, sand, invertase, acid phosphatase and catalase in soil had strong negative correlation with organic matter, cation exchange capacity, clay, available phosphorus, available potassium, fungi and urease in soil. While, there was a strong positive correlation between organic matter, cation exchange capacity, cosmid, available phosphorus, available potassium, fungi and urease. Principal component analysis results indicated that pH, organic matter, bulk density, available potassium and alkali nitrogen were key factors in soil physical and chemical properties.
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Key words:
- Cd pollution /
- paddy /
- physical and chemical properties of soil /
- microbes /
- enzyme activity /
- spatial variability
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