黄河三角洲不同土地利用方式土壤养分特征和酶活性及其相关性研究

Characteristics of Soil Nutrient and Enzyme Activity and Mutual Relative Analysis of Different Land Use Types in Yellow River Delta

对黄河三角洲四种主要土地利用类型土壤酶活性与养分含量及其相关性做了比较和研究。结果表明:土壤养分含量和酶活性均有显著性差异,土层剖面表层普遍高于20～40 cm层,撂荒地在退化土壤恢复中具有较好的效果;棉花地、苜蓿地、梨园属于掠夺式的土地利用方式,不利于土壤的持续利用;棉花地的灌水压盐措施,抬高了地下水位,土壤返盐严重。脲酶活性与有机质、全氮、速效氮、速效磷、速效钾均有显著相关性,可以作为黄河三角洲土壤肥力的评价指标。过氧化氢酶和过氧化物酶与土壤pH有显著相关性。

Characteristics of soil nutrient and enzyme activity and mutual relative analysis of four different land use were compared in Yellow River Delta. The results showed that significant differences existed in soil nutrient and soil enzyme activity. Land abandonment had better effect in the restoration of degrated soil. Planting cotton alfalfa and pear trees were all predatory ways in land use. They were disadvantageous to the sustainable land use. Irrigation of cotton land to reduce salt content in the land could raise ground water level ,resulting severe soil resalintion. Soil urease activity was significantly related to soil nutrients. It could be used as an index for soil fertility evaluation in Yellow River Delta. Significant correlation were found between peroxidase activity and catalase activity and soil pH.