有机物料对滨海盐渍土重金属根际效应的影响Ⅱ.土壤内源铁形态分布  

Rhizospheric effect of organic material on heavy metals in coastal saline soil Ⅱ. Distribution of soil native ferric forms.

作　　者：徐星凯[1] 张素君[1] 王子健[2] 

机构地区：[1]中国科学院沈阳应用生态研究所 [2]中国科学院生态环境研究中心

出　　处：《应用生态学报》1999年第4期430-432,共3页Chinese Journal of Applied Ecology

基　　金：中国科学院陆地生态系统痕量物质生态过程开放实验室基金

摘　　要：研究了排水条件下施用腐熟有机物料、种稻改良滨海盐渍土内源铁形态分布．结果表明，单淹水利于土中无定形氧化铁、络合态铁、有效态铁以及氧化铁活化度升高，并且络合态铁与有效态铁升高程度，低盐土壤显著；晶形氧化铁变化不明显，土中可能存在其它形态铁向晶形氧化铁转化．种稻不施有机物料，根际络合态铁和有效态铁富集；无定形氧化铁和晶形氧化铁亏缺．根际氧化铁活化度稍低于非根际．增施有机物料利于两种盐渍土根际内外铁形态向络合态铁和无定形氧化铁转化；有效态铁和氧化铁活化度提高。This paper studied the distribution of native ferric forms in coastal saline paddy soils with different salt contents under drainage condition and after applying decomposed organic material. The results showed that waterlogging was beneficial to the increase of amorphous iron oxide (A FeO), complexed Fe (Com Fe), DTPA extracted Fe and activity coefficient of iron oxide (ACIO) in saline soils tested whileas crystalline iron oxide (C FeO) almost had no change, suggesting the transformation of soil other unknown ferric forms to C FeO, and that Com Fe and DTPA extracted Fe in low saline soil increased more significantly than those in high saline soil. Planting rice without the application of organic material was beneficial to the enrichment of Com Fe and DTPA extracted Fe and the depletion of A FeO and C FeO in rhizospheric soil, and the lightly lower ACIO than that in non rhizospheric soil. Organic material improved the transformation of native ferric forms to Com Fe and A FeO in rice rhizospheric and non rhizospheric soils, particularly in rhizospheric soil with low salt content, and significantly increased DTPA extracted Fe and ACIO in these soils.

关 键 词：重金属 铁形态分布 有机物料 根际 盐渍土 

分 类 号：S155.33[农业科学—土壤学]