腐殖质对白浆土中Fe、Mn、Al形态转化及磷生物有效性的影响  

EFFECT OF CHANGE IN HUMUS COMPOSITION ON OXIDES OF FE， MN， AL AND PHOSPHORUS IN ALBIC SOIL

作　　者：吴龙华[1] 高子勤[2] 

机构地区：[1]中国科学院南京土壤研究所,南京210008 [2]中国科学院沈阳应用生态研究所,沈阳110015

出　　处：《土壤学报》2001年第1期81-88,共8页Acta Pedologica Sinica

基　　金："八五"国家科技攻关项目!(85-005-01-04)的一部分

摘　　要：在三江平原布置长期试验，研究连年施用有机肥后土壤腐殖质变化及其对白浆±Fe、Mn、Al形态转化及磷生物有效性的影响。结果表明，施用牛粪后土壤腐殖质含量升高，且以松结态腐殖质的增长为主；土壤的DTPA提取态和有机络合态Fe、Mn、Al含量上升，使土壤有效态磷含量上升。因此，生物措施是治理白浆土，促进土壤磷素养分有效性上升，增大土壤缓冲容量和抗逆性的有效措施。A long-term plot experiment was conducted in the Sanjiang Plain to study the effect of applying organic manure for years in row on soil humus composition, transformations of Fe, Mn and Al oxides and phosphorus availability. The results indicated that soil humus, mainly loosely combined humus were increased after 4 years of adding cow feces, because of the supply of lowmolecule organic acid released from the added cow feces. The contents of DTPA-extractable and organo*chelated Fe, Mn, Al was also related to organic acid corroding soil coating and solublizing soil oxide. Some half-products derived from the fresh material can supply H＋, and can chelate or solublize soil Fe, Mn, Al or compete for adsorption site on soil colloid, and form Fe, Al-OM-P or soil colloid-OM-P compounds, thus bring about significant increase in soil available P. So the bio-Measure is an effective strategy to ameliorate albic soil, enhance its nutrient, especially P, availability and its buffer capacity and stress杛esistance.

关 键 词：白浆土 腐殖质 P有效性 铁 锰 铝 形态转化 

分 类 号：S158.3[农业科学—土壤学] S155.26[农业科学—农业基础科学]