摘要
Chicken manures added with Cu and Zn were used for composting experiment to study the dynamics of different soluble humus complexed copper （H2O-Cu,NaOH-Cu and NaOH-Na4P2O7-Cu）.The effect of zinc in compost on humus complexed copper and the relationship between humus complexed copper were also revealed.The results showed that H2O-Cu increased before the 45 d of composting and decreased thereafter.In the treatments of 1：1,2：1 and 3：1 with the added copper content increasing,H2O-Cu increased with decomposition process.Added high level zinc in manure could decrease the relative H2O-Cu content at the last stage of composting.NaOH-Cu decreased greatly with the compost proceeding.With the added copper content increasing in manure,the percentage of NaOH-Cu to total copper decreased.Added zinc had no significant impact on NaOH-Cu concentration.NaOH-Na4P2O7-Cu increased with composting.With the added copper content increasing in compost manure,the percentage of NaOH-Na4P2O7-Cu to total copper increased,and showed an increase trend with composting proceeding.Added zinc in manure increased NaOH-Na4P2O7-Cu.In composts,55-80% of extracted copper was present in NaOH fraction,10-30% in NaOH-Na4P2O7-Cu fraction,and 0-10% in H2O fraction.Whatever the added copper or zinc contents increased in manures,the distribution percent of NaOH- Na4P2O7-Cu （pressed as percent of extracted Cu） increased and that of H2O-Cu and NaOH-Cu decreased.Three extracted Cu （H2O,NaOH and Na4P2O7） were strongly correlated to each other,H2O-Cu and NaOH-Na4P2O7-Cu were significantly correlated to H2O-extracted organic C and NaOH-Na4P2O7-extracted organic C,respectively.
Chicken manures added with Cu and Zn were used for composting experiment to study the dynamics of different soluble humus complexed copper （H2O-Cu,NaOH-Cu and NaOH-Na4P2O7-Cu）.The effect of zinc in compost on humus complexed copper and the relationship between humus complexed copper were also revealed.The results showed that H2O-Cu increased before the 45 d of composting and decreased thereafter.In the treatments of 1：1,2：1 and 3：1 with the added copper content increasing,H2O-Cu increased with decomposition process.Added high level zinc in manure could decrease the relative H2O-Cu content at the last stage of composting.NaOH-Cu decreased greatly with the compost proceeding.With the added copper content increasing in manure,the percentage of NaOH-Cu to total copper decreased.Added zinc had no significant impact on NaOH-Cu concentration.NaOH-Na4P2O7-Cu increased with composting.With the added copper content increasing in compost manure,the percentage of NaOH-Na4P2O7-Cu to total copper increased,and showed an increase trend with composting proceeding.Added zinc in manure increased NaOH-Na4P2O7-Cu.In composts,55-80% of extracted copper was present in NaOH fraction,10-30% in NaOH-Na4P2O7-Cu fraction,and 0-10% in H2O fraction.Whatever the added copper or zinc contents increased in manures,the distribution percent of NaOH- Na4P2O7-Cu （pressed as percent of extracted Cu） increased and that of H2O-Cu and NaOH-Cu decreased.Three extracted Cu （H2O,NaOH and Na4P2O7） were strongly correlated to each other,H2O-Cu and NaOH-Na4P2O7-Cu were significantly correlated to H2O-extracted organic C and NaOH-Na4P2O7-extracted organic C,respectively.
基金
supported by the National Natural Science Foundation of China (39800093)
the Youth Project of Northwest A&F University, China
the Innovative Project for University Students of Ministry of Education of China
the Key Technologies R&D Program of China during the 11th Five-Year Plan period (2007BAD89B16)
