沼气发酵残留物对红富士苹果园土壤酶活性的影响

对干旱地区的红富士苹果园土壤中施沼肥定位试验施肥后收获期土壤主要土壤酶种类及活性进行分析结果表明:施沼肥土壤中主要存在脲酶、磷酸酶、过氧化氢酶和蔗糖酶等4种土壤酶,它们的酶活性存在差异,施工程沼肥果园中除蔗糖酶外其余酶活性均高于施户用沼肥果园.对土壤酶和土壤养分进行相关分析、通径分析、主成分分析结果表明,施户用沼肥果园的脲酶、过氧化氢酶和蔗糖酶和施工程沼肥果园的蔗糖酶都可以作为土壤肥力的指标,且酶活性大小受到土壤化学性质和其它酶活性影响.土壤主成分分析能较为客观地评价土壤肥力水平.

Effect of biogas residues on soil enzyme activity of red Fuji apple orchards

The soil enzyme activities were studied after biogas residues applied. The activity of 4 soil enzymes were measured at the ecotypic orchard station of Northwest A&F University,and the result showed that the activity of 4 chief soil enzymes varied,including urease,phosphatase,catalase and sucrase.Except sucrase,the activity of other soil enzymes of biogas residues in household biogas digester was greater than biogas residues in project biogas digester.The effect of urease and catalase activities of biogas residues in household digester on organic matter were significantly positive,the same as that of urease and catalase activities of biogas residues in project digester on organic matter.The results obtained through the correlation,path and principal component analysis showed that that soil urease,catalase and sucrase using biogas residues in household digester and soil sucrase using biogas residues in project digester could all be as a comprehensive index of soil fertility.Soil fertility could be evaluated objectively by principal component analysis.