硅肥耦合水分管理对土壤As形态及水稻As累积的影响

打开文本图片集

中图分类号：S156 文献标识码：A 文章编号：1006-060X（2025）05-0027-06

引用格式：，等.硅肥耦合水分管理对土壤As形态及水稻As累积的影响[J.湖南农业科学，2025（5）：27-32

DOI：10.16498/j.cnki.hnnykx.2025.005.006

Abstract：Pot experiments were conducted with diferent water management practices combined with silicon application to investigate theeffects of water managementcombined with siliconapplicationonarsenic （As）accumulation inriceand the bioavailabilityofAsinpaddysoil.TheresultsshowedthattheAscontentinbrownriceunderalternatingdryingandwettig（IF） and alternating drying and weting combined with silicon application （IF+Si） ）decreased by 54.6% （P<0.05） ）and 54.5% （P<0.05） ， respectively，compared withconventional water management （CK）andconventional watermanagementcombined with silicon application （ CK+Si） . Compared with CK，IF increased the content of available silicon and reduced the content of available As in soil. ThesilicoaplcationincreasedthepHandavailablesiliconcontentbutdecreasedthecontentofavailableAs insoil.Comparedwith CK，IFreducedthecontentofexchangeableAs （Exc-As），carbonate-boundAs （Carb-As），andiro-manganeseoxide-boundAs FeMnOx-As）insoil.Under thesame water management，thecontentofExc-As and Carb-Asdecreased aftersiliconaplication.The As contentinricestemsandleavesandthecontentofweakacidextractableAs （Acid-As）andCarb-Asinsoildirectlyafectedthe As uptake bybrowice.Soil pHandExc-AscontentdiretlyafectedtheabsoptionofAsbyricerots.Alteatingdryingandweting combined with silicon application can effectively reduce the uptake ofAs by brown rice in production.

Keywords：rice;arsenic contamination; silicon;water management; bioavailability

砷（As）作为强毒性类金属元素，在水稻中有较强的富集能力[。（剩余11571字）