Effects of long-term application of different green manures on ferric iron reduction in a red paddy soil in Southern China

文献类型： 外文期刊

第一作者： Gao Song-juan

作者： Gao Song-juan;Cao Wei-dong;Gao Ju-sheng;Huang Jing;Bai Jin-shun;Zeng Nao-hua;Chang Dan-na;Gao Song-juan;Chang Dan-na;Cao Wei-dong;Gao Ju-sheng;Huang Jing;Shimizu, Katsuyoshi

作者机构：

关键词： green manure;red paddy soil;ferric iron reduction;rice-rice-winter green manure cropping system

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2017 年 16 卷 4 期

页码：

收录情况： SCI

摘要： Dissimilatory Fe(III) reduction is an important process in the geochemical cycle of iron in anoxic environment. As the main products of dissimilatory iron reduction, the Fe(II) species accumulation could indicate the reduction ability. The effects of different green manures on Fe(III) reduction in paddy soil were explored based on a 31-year rice-rice-winter green manure cropping experiment. Four treatments were involved, i.e., rice-rice-milk vetch (RRV), rice-rice-rape (RRP), rice-rice-rye-grass (RRG) and rice-rice-winter fallow (RRF). Soils were sampled at flowering stage of milk vetch and rape (S1), before transplantation (S2), at filleting (S3), jointing (S4), and mature (S5) stages of the early rice, and after the harvest of the late rice (S6). The contents of TFeHCI (HCI-extractable total Fe), Fe(II)(HCI) (HCI-extractable Fe(II) species) and Fe(III)(HCI) (HCI-extractable Fe(III) species) were measured. The correlations among those Fe species with selected soil environmental factors and the dynamic characteristics of Fe(II)(HCI) accumulation were investigated. The results showed that TFeHCI in RRF was significantly higher than those in the green manure treatments at most of the sampling stages. Fe(II)(HCI) increased rapidly after the incorporation of green manures in all treatments and kept rising with the growth of early rice. Fe(II)(HCI) in RRG was quite different from those in other treatments, i.e., it reached the highest at the S2 stage, then increased slowly and became the lowest one at the S4 and S5 stages. Fe(III)(HCI) showed oppositely, and Fe(11)(HCI)/Fe(111)(HCI) performed similarly to Fe(II)(HCI). The maximum accumulation potential of Fe(II)(HCI) was significantly higher in RRF, while the highest maximum reaction rate of Fe(II)(HCI) accumulation appeared in RRG. Significant correlations were found between the indexes of Fe(II)(HCI) accumulation and soil pH, oxidation-reduction potential (Eh) and total organic acids, respectively. In together, we found that long-term application of green manures decreased the TFeHCI in red paddy soils, but promoted the ability of Fe(III) reduction, especially the ryegrass; Fe(II)(HCI) increased along with the growth of rice and was affected by soil conditions and environmental factors, especially the water and redox ability.

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