【摘要】：中國(guó)南方紅壤中的磷素大多以鐵磷復(fù)合物的形式被固定于土壤中,磷的利用率較低。通過(guò)向土壤中添加以S.oneidensis MR~(-1)為主的生物肥料,促進(jìn)土壤磷的釋放,減少外源磷肥的輸入,以期達(dá)到保護(hù)環(huán)境和資源節(jié)約的目的。采用室內(nèi)模擬試驗(yàn),在純化學(xué)培養(yǎng)的條件下,采用接種S.oneidensis MR~(-1)的厭氧體系進(jìn)行培養(yǎng),分別以磷吸附態(tài)的水鐵礦(水鐵礦-磷)、磷吸附態(tài)的針鐵礦(針鐵礦-磷)和磷酸鐵(FePO_(4-)磷)作為體系唯一的磷素和Fe(Ⅲ)來(lái)源,3種磷均為土壤中鐵磷復(fù)合物的組成成分。結(jié)果表明,S.oneidensis MR~(-1)對(duì)3種鐵磷復(fù)合物中的Fe(Ⅲ)產(chǎn)生了還原效應(yīng)并將其還原成Fe(Ⅱ),且Fe(Ⅱ)質(zhì)量濃度隨試驗(yàn)時(shí)間延長(zhǎng)總體呈先增長(zhǎng)后穩(wěn)定的變化趨勢(shì);當(dāng)3組加入S.oneidensis MR~(-1)的體系Fe(Ⅱ)質(zhì)量濃度均為最高時(shí),Fe(Ⅱ)平均生成速率表現(xiàn)為:針鐵礦(30.44 mg·L~(-1)·d~(-1))水鐵礦(21.05 mg·L~(-1)·d~(-1))磷酸鐵(6.62 mg·L~(-1)·d~(-1));3組加入S.oneidensis MR~(-1)的體系Fe(Ⅲ)質(zhì)量濃度與初始質(zhì)量濃度相比較均發(fā)生了改變,在針鐵礦-磷-菌體系中Fe(Ⅲ)質(zhì)量濃度極低,而水鐵礦-磷-菌體系和磷酸鐵-磷-菌體系中則大量存在Fe(Ⅲ);至試驗(yàn)結(jié)束時(shí),磷酸鐵-磷-菌體系中總磷質(zhì)量濃度是初始時(shí)的2.3倍,而針鐵礦-磷-菌和水鐵礦-磷-菌體系的總磷約為初始質(zhì)量濃度的1/10。因此,S.oneidensis MR~(-1)利用磷酸鐵-磷的過(guò)程會(huì)促進(jìn)磷的釋放,使磷酸鐵中磷得以活化,而利用針鐵礦-磷和水鐵礦-磷的過(guò)程則會(huì)消耗磷,不會(huì)造成磷累積。
[Abstract]:Phosphorus in red soil of southern China is mostly immobilized in the form of iron-phosphorus complex, and the utilization rate of phosphorus is low. In order to protect the environment and save resources, S.oneidensis MR~ (-1) was added to the soil to promote the release of soil phosphorus and reduce the input of exogenous phosphorus fertilizer. In laboratory simulation experiment, the anaerobic system inoculated with S.oneidensis MR~ (-1) was used to culture under pure chemical culture conditions, respectively, and the ferrite (pyrite phosphate) adsorbed by phosphorus was used. Phosphorus-adsorbed goethite (goethite-phosphorus) and ferric phosphate (FePO_ (4-) P) were the sole sources of phosphorus and Fe (鈪，

本文編號(hào)：2316050