Hunan Province of China,lying in the centralof subtropical zone,is one of the major pro-duction areas of double-season rice.Rice pad-dy is the main agricultural soil of the area.Mixed samples of plough horizon（0-20cm...Hunan Province of China,lying in the centralof subtropical zone,is one of the major pro-duction areas of double-season rice.Rice pad-dy is the main agricultural soil of the area.Mixed samples of plough horizon（0-20cm）ofmajor types of paddy soils were collected be- fore cultivation in the spring of 1996-1997.The chemical fractions of inorganic phosphatesand the relationships between inorganic phos- phates and olsen-available P in the soils werestudied by using the fractionation system of in-organic phosphates proposed by JIANG Baifanet al.展开更多
Phytoremediation and soil washing are both potentially useful for remediating arsenic（As）-contaminated soils.We evaluated the effectiveness of a combined process coupling phytoremediation and in situ soil flushing f...Phytoremediation and soil washing are both potentially useful for remediating arsenic（As）-contaminated soils.We evaluated the effectiveness of a combined process coupling phytoremediation and in situ soil flushing for removal of As in contaminated soil through a pilot study.The results showed that growing Pteris vittata L.（P.v.） accompanied by soil flushing of phosphate（P.v./Flushing treatment） could significantly decrease the total As concentration of soil over a 37 day flushing period compared with the single flushing（Flushing treatment）.The P.v./Flushing treatment removed 54.04% of soil As from contaminated soil compared to 47.16% in Flushing treatment,suggesting that the growth of P.vittata was beneficial for promoting the removal efficiency.We analyzed the As fractionation in soil and As concentration in soil solution to reveal the mechanism behind this combined process.Results showed that comparing with the control treatment,the percent of labile arsenate fraction significantly increased by 17% under P.v./Flushing treatment.As concentration in soil solution remained a high lever during the middle and later periods（51.26–56.22 mg/L）,which was significantly higher than the Flushing treatment.Although soil flushing of phosphate for more than a month,P.vittata still had good accumulation and transfer capacity of As of the soil.The results of the research revealed that combination of phytoremediation and in situ soil flushing is available to remediate As-contaminated soils.展开更多
文摘Hunan Province of China,lying in the centralof subtropical zone,is one of the major pro-duction areas of double-season rice.Rice pad-dy is the main agricultural soil of the area.Mixed samples of plough horizon（0-20cm）ofmajor types of paddy soils were collected be- fore cultivation in the spring of 1996-1997.The chemical fractions of inorganic phosphatesand the relationships between inorganic phos- phates and olsen-available P in the soils werestudied by using the fractionation system of in-organic phosphates proposed by JIANG Baifanet al.
基金supported by the National Natural Science Foundation of China(No.41271339)the National High Technology Research and Development Program(863)of China(No.2012AA06A201)Beijing Municipal Science and Technology Project(No.Z141100000914011)
文摘Phytoremediation and soil washing are both potentially useful for remediating arsenic（As）-contaminated soils.We evaluated the effectiveness of a combined process coupling phytoremediation and in situ soil flushing for removal of As in contaminated soil through a pilot study.The results showed that growing Pteris vittata L.（P.v.） accompanied by soil flushing of phosphate（P.v./Flushing treatment） could significantly decrease the total As concentration of soil over a 37 day flushing period compared with the single flushing（Flushing treatment）.The P.v./Flushing treatment removed 54.04% of soil As from contaminated soil compared to 47.16% in Flushing treatment,suggesting that the growth of P.vittata was beneficial for promoting the removal efficiency.We analyzed the As fractionation in soil and As concentration in soil solution to reveal the mechanism behind this combined process.Results showed that comparing with the control treatment,the percent of labile arsenate fraction significantly increased by 17% under P.v./Flushing treatment.As concentration in soil solution remained a high lever during the middle and later periods（51.26–56.22 mg/L）,which was significantly higher than the Flushing treatment.Although soil flushing of phosphate for more than a month,P.vittata still had good accumulation and transfer capacity of As of the soil.The results of the research revealed that combination of phytoremediation and in situ soil flushing is available to remediate As-contaminated soils.
