水稻根际与非根际土壤硫素赋存形态转化及其迁移规律

发布时间：2018-01-19 03:10

本文关键词： 硫肥根际土非根际土污染水稻土硫赋存形态　出处：《环境科学》2016年07期 　论文类型：期刊论文

【摘要】：在未污染及重金属污染水稻土上施用不同硫肥处理,通过池栽试验研究硫在水稻根际与非根际土壤中迁移规律及其赋存形态的影响.结果表明,在水稻生育期内,根际与非根际土壤溶液Eh、pH和pe+pH范围分别在93~283 mV和83~254 mV之间、7.5~8.4和7.7~8.4之间、9.1~13.2和9.1~12.5之间.根际土Eh总体上高于非根际土,根际土pH总体上低于非根际土.在根际土壤中,水溶性硫(占总无机硫的41%~81%,下同)郘吸附性硫(9%~34%)盐酸可溶性硫(8%~24%)盐酸挥发性硫(2%~8%).在分蘖期和抽穗扬花期,水溶性硫和吸附性硫的质量分数,施用石膏处理的显著性高于单质硫处理的;对未污染水稻土,其质量分数显著性高于污染水稻土的.在非根际土壤,水溶性硫(40%~69%)郘盐酸可溶性硫(18%~41%)盐酸挥发性硫(6%~16%)吸附性硫(0.7%~7.5%).根际土与非根际土壤的无机硫质量分数分别为223~738mg·kg~(-1)和68~128 mg·kg~(-1),土壤有机硫质量分数分别为574~1 647 mg·kg~(-1)和108~391 mg·kg~(-1),总硫的质量分数分别为825~2 287 mg·kg~(-1)和200~477 mg·kg~(-1).水稻根际土中,无机硫和有机硫分别占总硫20%~40%和60%~80%;非根际土为18%~46%和54%~82%.水稻根际土在总硫、有机硫、水溶性硫、吸附性硫和盐酸可溶性硫的质量分数分别是非根际土壤的3~11倍、3~5倍、5~7倍,12~20倍、2~3倍,而盐酸挥发性硫的质量分数低于非根际土.
[Abstract]:Different sulfur fertilizer treatments were applied to unpolluted and heavy metal contaminated paddy soils. The effects of sulfur migration and its occurrence in rice rhizosphere and non-rhizosphere soil were studied by pot experiment. During the growth period of rice, the pH ranges of Ehn and pe in rhizosphere and non-rhizosphere soil solutions were between 93,283mV and 83254mV, respectively. The Eh in rhizosphere soil was generally higher than that in non-rhizosphere soil. The pH of rhizosphere soil was lower than that of non-rhizosphere soil in general. In rhizosphere soil, water soluble sulfur (accounting for 41 1% of total inorganic sulfur) was found in rhizosphere soil. The content of water soluble sulfur and adsorptive sulfur at tillering stage and heading stage. The significance of gypsum treatment was higher than that of elemental sulfur treatment. For unpolluted paddy soil, its mass fraction was significantly higher than that in non-rhizosphere soil. Water soluble Sulphur 40) soluble Sulphur Hydrochloride 18 / 41) volatile Sulphur Hydrochloric Acid (6 / 16) absorbent sulfur 0.7 / 7.5). The contents of inorganic sulfur in rhizosphere soil and non-rhizosphere soil were 22 23738 mg 路kg ~ (-1) and 68 ~ (8) mg 路kg ~ (-1) respectively. The content of organic sulfur in soil was 574 ~ 1647 mg 路kg ~ (-1) and 108 ~ 391 mg 路kg ~ (-1) respectively. The mass fraction of total sulfur was 825 ~ (2 287) mg 路kg ~ (-1) and 200 ~ 477 mg 路kg ~ (-1) 路kg ~ (-1) respectively. Inorganic sulfur and organic sulfur accounted for 40% and 60% of total sulfur, respectively. The mass fraction of total sulfur, organic sulfur, water-soluble sulfur, adsorptive sulfur and hydrochloric acid soluble sulfur in rice rhizosphere soil were 31.11 times as much as those in non-rhizosphere soil, respectively. The content of volatile sulfur in hydrochloric acid was lower than that in non-rhizosphere soil.
【作者单位】：河南农业大学资源与环境学院;河南农业大学理学院;中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室;
【基金】：国家自然科学基金项目(41271471;41371311;41401273;41201286)
【分类号】：S153;X53
【正文快照】： 土壤与农业可持续发展国家重点实验室,南京210008)根际由植物根系周围的土壤组成,它是自身生命活动最活跃、最强烈的区域[1],它是根系相对独立的活动区域,它的物理、化学和生物性质不同于非根际土壤[2].根际是土壤植物交互作用的界面,是关系到植物营养元素的吸收,重金属防治的

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