摘要
为将M3法更广泛的应用于测土配方施肥,本文通过在我国北方主要农田耕地采集248个土壤样本,分别用M3法和DTPA法进行有效态Zn、Cu、Fe、Mn含量的测定,分析两种方法的相关性及差异性,并结合Tessier连续提取法分析两种方法的浸提特征。结果显示,M3法与DTPA法的有效态Zn、Cu、Fe、Mn测定值之间均呈极显著正相关,Mn测定值没有达到显著相关。M3测定值大于DTPA法,平均值之比分别为2.1、2.2、4.6、4.0。通过Tessier连续浸提分析发现,M3法和DTPA法对Tessier连续浸提法的五个组分都有浸出,有效态Zn主要浸出交换态和碳酸盐结合态,浸出了少量的铁锰结合态、有机结合态和残渣态,有效态Cu主要浸出交换态和有机结合态,浸出了少量的碳酸盐结合态、铁锰结合态和残渣态。M3法对铁锰氧化物结合态和残渣态的Zn、Cu浸出比例高于DTPA法。总之,M3法测定土壤有效态Zn、Cu、Fe和DTPA法相关性极显著,可以替代DTPA法应用于推荐施肥,而且M3法和DTPA法浸提土壤有效态Zn、Cu高于Tessier的交换态Zn、Cu,对铁锰结合态、有机结合态和残渣结合态Zn、Cu有部分浸出,并且M3法浸出量高于DTPA法,在测土配方施肥时应考虑两种方法的浸出特征,建立相应的微量元素丰缺临界指标。
In order that M3 method could be extensively used to measure the application of fertilizer in the soil, this study selected M3 method and DTPA method for the determination of available Zn, Cu, Fe and Mn contents in 248 soils collected in agricultural land of northern China, and analyzed their correlations and differences, as well as extraction features combined with Tessier five-step sequential extraction method. The results showed that the measured values of soil available Zn, Cu and Fe by M3 and DTPA methods were significantly positively correlated while those of soil available Mn were not significantly correlated with each other. The measured values of M3 method were greater than those of DTPA method, and the ratios of their average values were respectively 2.1, 2.2, 4.6 and 4.0. Through the Tessier sequential extraction analysis, M3 and DTPA methods extracted five fractions of the Tessier sequential extraction method. The leached available Zn was mainly exchangeable and carbonate-bound, a little iron and manganese bound, organic matter bound and residual. The leached available Cu mainly consisted of exchangeable and organic matter bound but less for carbonate-bound, iron and manganese oxides bound, and residual. The proportions of iron-manganese bound and residual Zn and Cu extracted by M3 method were higher than those extracted by DTPA method. In conclusion, soil available Zn, Cu, Fe and Mn concentrations extracted by M3 method were correlated significantly with those of DTPA method. Therefore, M3 method could replace DTPA method for the fertilizer recommendation. With M3 method and DTPA method, extracted soil available Zn and Cu concentrations were higher than those of Tessier, and iron-manganese bound and residual Zn and Cu were partly extracted. The extracted amount by M3 method was higher than DTPA method. During the course of testing soil for formulated fertilization, the extraction features of these two methods should be considered and the critical indexes of abundance and deficiency of trace element s
出处
《土壤通报》
CAS
CSCD
北大核心
2013年第2期420-427,共8页
Chinese Journal of Soil Science
基金
国家科技支撑计划重点项目(2008BADA4B01)
山西省引进优秀人才专项基金(2010)
山西省留学基金(2011)资助
