对土壤微量元素，老化的腐殖质有固定作用，新生的活性腐殖质有促进活性作用。
For soil trace element, the ageing humus had fixed effect. The nascent active humus had effect to promote the activity.
在杏园和苹果园覆盖麦草，研究其对土壤腐殖质组成、微生物区系及土壤酶活性变化的影响。
The experiment was carried out to evaluate effects of covering wheat straw in apple orchard and apricot orchard on soil humus composition, microflora and soil enzyme activities.
同时，土壤腐殖质含量与纤维素酶活性、纤维素酶活性与过氧化氢酶活性间有很好的相关性。
Further-more, there are well correlations between the content of humus and cellulase activity, between cellulase and hydrogen peroxidase activity.
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