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2009年对取自浙江省宁波市郊14个酸性水稻土有效锌的测定方法及评价标准进行了比较研究,结果表明:(1)用DTPA和0.1mol/L盐酸提取的有效锌平均含量分别为3.64mg/kg和2.67mg/kg,前者要比后者高。其原因是DTPA提取的有效锌包含了有机络合态锌;但两种方法测定的有效锌含量呈线性相关。(2)两种方法测定的潴育型水稻土有效锌含量均低于脱潜型水稻土,因前者有机质和黏粒含量以及灌溉水中含锌量要比后者低。(3)由于DTPA测得的有效锌含量高而临界值标准低,0.1mol/L盐酸测得的有效锌含量低而临界值标准高,同一土壤有不同的分级级别,因此对水稻土有效锌的测定方法及评价标准有必要进行进一步研究。
In 2009, the determination methods and evaluation criteria of available zinc from 14 acidic paddy soils in suburb of Ningbo of Zhejiang Province were compared. The results showed that: (1) The average effective zinc content extracted with DTPA and 0.1 mol / L hydrochloric acid were 3.64 mg / kg and 2.67 mg / kg, the former is higher than the latter. The reason for this is that the available zinc extracted by DTPA contains organic complex zinc, but the available zinc measured by the two methods is linearly related. (2) The available Zn content in both types of paddy soils was lower than that in desolatted paddy soils, because of the lower organic matter and clay content and the zinc content in irrigation water. (3) Because of the high available zinc content and the low critical value, the effective zinc content measured by 0.1 mol / L hydrochloric acid is low and the critical value is high, and the same soil has different grading levels. Therefore, the available zinc The determination method and evaluation criteria need further study.