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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)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%)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.
Different sulfur fertilizers were applied on unpolluted and heavy metal contaminated paddy soils and the effects of sulfur on the migration and distribution of sulfur in rhizosphere and non-rhizosphere soil of rice were studied by means of a pot experiment.The results showed that during the growth period of rice, Rhizosphere and non-rhizosphere soil Eh, pH and pe + pH ranged from 93 to 283 mV and 83 to 254 mV, from 7.5 to 8.4 and 7.7 to 8.4, from 9.1 to 13.2 and from 9.1 to 12.5, respectively. The rhizosphere soil Eh was generally higher than the non-rhizosphere soil, rhizosphere soil pH was generally lower than non-rhizosphere soil.In the rhizosphere soil, water-soluble sulfur (41% to 81% of total inorganic sulfur, the same below) absorbent sulfur (9% ~ 34%)> soluble sulfur (8% ~ 24%)> volatile sulfur (2% ~ 8%). At the tillering and flowering stages, water- , The content of gypsum was significantly higher than that of elemental sulfur, and the content of unprocessed paddy soil was significantly higher than that of paddy soil.In non-rhizosphere soil, water-soluble sulfur (40% -69% ) Sulfuric acid soluble sulfur (18% ~ 41%)> hydrochloric acid volatile sulfur (6% ~ 16%)> adsorptive sulfur (0.7% ~ 7.5%) .The content of inorganic sulfur in rhizosphere soil and non- The results showed that there were 223 ~ 738 mg · kg -1 and 68 ~ 128 mg · kg -1 soil The mass fraction of sulfur was 574 ~ 1647 mg · kg -1 and 108 ~ 391 mg · kg -1, respectively, and the total sulfur contents were 825 ~ 2287 mg · kg -1 and 200 ~ 477 mg · kg -1 .The contents of inorganic sulfur and organic sulfur in rhizosphere soil of rice were 20% -40% and 60% ~ 80% of the total sulfur, 18% -46% 54% -82% .The contents of total sulfur, organic sulfur, soluble sulfur, adsorptive sulfur and hydrochloric acid soluble sulfur in rhizosphere soil of rice were 3 ~ 11 times, 3 ~ 5 times, 5 ~ 7 Times, 12 to 20 times, 2 to 3 times, while the mass fraction of volatile sulfur in hydrochloric acid is lower than non-rhizosphere soil.