现代农业科技
現代農業科技
현대농업과기
XIANDAIHUA NONGYE
2014年
6期
217-219,221
,共4页
侯颖臻%赵秀芳%傅瓦利%赖羽寒
侯穎臻%趙秀芳%傅瓦利%賴羽寒
후영진%조수방%부와리%뢰우한
吹填土%PVA%理化性质
吹填土%PVA%理化性質
취전토%PVA%이화성질
dredge fill%PVA%physical and chemical properties
吹填土来源于海底淤泥，含盐量高，土质黏紧，无法直接用于生态建设，为改善吹填土结构，提高吹填土的脱盐效率，提升吹填土生态利用价值，利用新型土壤改良剂---高分子聚合物PVA，通过室内土柱淋洗试验，研究不同浓度的PVA溶液对天津滨海吹填土透水性、水稳性团聚体、含水量、电导率、水溶性盐基离子和pH值变化的影响。结果表明：0.2%、0.5%和1.0%3个PVA浓度下的吹填土淋出液电导率降至1 dS/m以下，历时分别为350、361 h和400 h，未施用处理则用时587 h；淋洗412 h后淋出液总体积分别为1.69、1.76、1.28 L，未施用处理为0.47 L，较未施用分别增加了259.57%、274.47%、172.34%；0.25 mm以上的土壤水稳性团聚体含量较未施用处理的22.40%分别增加了37.9、42.6、46.9个百分点；淋洗412 h后吹填土全盐量均小于9.674 g/kg，pH值较处理前有所升高。
吹填土來源于海底淤泥，含鹽量高，土質黏緊，無法直接用于生態建設，為改善吹填土結構，提高吹填土的脫鹽效率，提升吹填土生態利用價值，利用新型土壤改良劑---高分子聚閤物PVA，通過室內土柱淋洗試驗，研究不同濃度的PVA溶液對天津濱海吹填土透水性、水穩性糰聚體、含水量、電導率、水溶性鹽基離子和pH值變化的影響。結果錶明：0.2%、0.5%和1.0%3箇PVA濃度下的吹填土淋齣液電導率降至1 dS/m以下，歷時分彆為350、361 h和400 h，未施用處理則用時587 h；淋洗412 h後淋齣液總體積分彆為1.69、1.76、1.28 L，未施用處理為0.47 L，較未施用分彆增加瞭259.57%、274.47%、172.34%；0.25 mm以上的土壤水穩性糰聚體含量較未施用處理的22.40%分彆增加瞭37.9、42.6、46.9箇百分點；淋洗412 h後吹填土全鹽量均小于9.674 g/kg，pH值較處理前有所升高。
취전토래원우해저어니，함염량고，토질점긴，무법직접용우생태건설，위개선취전토결구，제고취전토적탈염효솔，제승취전토생태이용개치，이용신형토양개량제---고분자취합물PVA，통과실내토주림세시험，연구불동농도적PVA용액대천진빈해취전토투수성、수은성단취체、함수량、전도솔、수용성염기리자화pH치변화적영향。결과표명：0.2%、0.5%화1.0%3개PVA농도하적취전토림출액전도솔강지1 dS/m이하，력시분별위350、361 h화400 h，미시용처리칙용시587 h；림세412 h후림출액총체적분별위1.69、1.76、1.28 L，미시용처리위0.47 L，교미시용분별증가료259.57%、274.47%、172.34%；0.25 mm이상적토양수은성단취체함량교미시용처리적22.40%분별증가료37.9、42.6、46.9개백분점；림세412 h후취전토전염량균소우9.674 g/kg，pH치교처리전유소승고。
Dredge fill originally came from sludge beyond the seabed,it was impossible to be applied to ecological construction directly due to its high salinity and soil texture.To improve the structure and desalting efficiency of dredge fill and enhance the ecological value of that soil in use,a kind of new soil conditioner high molecular compound called PVA was applied.Effects of PVA by different concentration on the variation of water permeability,water stable aggregate,moisture,EC,water soluble base ion and pH of hydraulic fill were studied by soil column leaching test in the laboratory in this paper.The results showed that when the concentration of PVA were 0.2%,0.5%and 1.0%,it cost 350,361 and 400 h while EC of leachate decreased below 1 dS/m,while soil without application used 587 h;When leaching last for 412 h,the total volume of leachate were 1.69、1.76 and 1.28 L,compared to soil without application of which leachate volume was 0.47 L,were increased by 259.57%、274.47%and 172.34%.Content of water stable aggregate which is larger than 0.25 mm were increased by 37.9、42.6 and 46.9 percentage point compared to 22.4% from soil without application.soil salinity was all less than 9.674 g/kg in 412 h of leaching,pH value was higher than original soil.
