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为了探讨城郊区不同土地利用方式对土壤养分及酶活性的影响,采用野外采样及试验室分析方法,对重庆市城郊区4种土地利用方式下的土壤养分含量及酶活性进行研究。结果表明:不同土地利用方式下土壤养分及酶活性存在较大差异。对于土壤养分含量而言,0～60cm土层有机质和碱解氮均以水田最高;速效磷0～40cm以旱地最高,表现为:旱地>菜地>水田>果园,40～60cm表现为:旱地>水田>菜地>果园;速效钾0～20cm以果园最高,其次是水田,再次是旱地,最后是菜地。土壤脲酶活性在0～20cm具体表现为:旱地>菜地>水田>果园;过氧化氢酶活性在0～20cm具体表现为:水田>果园=菜地>旱地。不同土地利用方式的土壤速效养分在各层基本达到显著水平,土壤酶活性差异显著性不明显(P<0.05)。
In order to investigate the effects of different land use patterns on soil nutrients and enzyme activities in suburban areas, soil nutrient contents and enzyme activities under four land use patterns in urban and suburban areas of Chongqing were studied using field sampling and laboratory analysis. The results showed that there were great differences in soil nutrients and enzyme activities under different land use patterns. For soil nutrient content, soil organic matter and alkali hydrolysis nitrogen in 0 ~ 60cm soil layer are the highest in paddy field; available phosphorus 0 ~ 40cm in dryland, highest in dry land> vegetable field> paddy field> orchard, 40-60cm in dry land > Paddy field> vegetable field> orchard; available potassium 0 ~ 20cm orchard highest, followed by paddy fields, dry land again, and finally vegetable. The soil urease activity ranged from 0 to 20 cm: dry land> vegetable field> paddy field> orchard; catalase activity ranged from 0 to 20 cm: paddy field> orchard = vegetable field> dry land. Soil available nutrients in different land use patterns reached a significant level at all levels, and the difference in soil enzyme activities was not significant (P <0.05).