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中国农学通报

中国农学通报 ›› 2009, Vol. 25 ›› Issue (2): 229-235.

所属专题： 生物技术

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

城市不同功能区绿地土壤有机碳矿化和酶活性变化

郝瑞军,方海兰,沈烈英,李忠佩   

  • 收稿日期:2008-11-17 修回日期:1900-01-01 出版日期:2009-01-20 发布日期:2009-01-20

Changes of Soil Organic Carbon Mineralization and Enzyme Activities from Different Urban Functional Areas

  • Received:2008-11-17 Revised:1900-01-01 Online:2009-01-20 Published:2009-01-20

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摘要： 采用室内恒温培养法观测了城市不同功能区绿地土壤有机碳矿化的过程动态和酶活性变化。结果表明：不同功能区土壤酶活性差异显著，脲酶：公园＞学校＞居民区＞工厂＞道路；磷酸酶：公园＞工厂＞校园＞居民区＞道路；转化酶：居民区＞公园＞工厂＞道路＞学校；但不同功能区土壤有机碳矿化过程动态表现出相同规律，在培养前期有机碳矿化速率迅速下降，培养中期缓慢下降，培养后期保持相对稳定的趋势，有机碳矿化与培养时间符合对数关系；整个培养期内，土壤有机碳矿化速率及累计矿化量公园＞工厂＞道路＞学校＞居民区。统计分析表明，土壤有机碳矿化速率与土壤有机碳，水溶性有机碳以及微生物生物量碳含量显著相关，相关系数分别为0.850、0.689、0.485；土壤酶与土壤有机碳矿化没有直接的相关性，但脲酶、转化酶与土壤微生物生物量碳之间相关系数分别为0.606和0.642，间接影响土壤有机碳的矿化。

关键词: 糯玉米, 糯玉米, 杂交选育

Abstract: Through incubation tests in laboratory, the mineralization of soil organic carbon(SOC) and enzyme activities of different functional areas were observed. Results showed that enzyme activities were significantly different, urease activity: park＞school＞residence＞industry＞road; phosphatase activity: park＞industry＞school＞residence＞road; invertase activity: residence＞park＞industry＞road＞school; But the dynamic patterns of SOC mineralization from different functional areas were similarly, the rate of SOC mineralization decreased quickly at the beginning, and then decreased slowly during the middle incubation time, and keep relatively constant during the later incubation time, and fitted to logarithmic equation with incubation time. Statistic analysis results showed that mineralization rate of SOC were significantly correlated with SOC, water soluble organic carbon(WSOC) and microbial biomass carbon(MBC), the coefficient is 0.850、 0.689、0.485 respectively. Soil enzyme had no direct relationship with SOC mineralization, but the correlation coefficient between microbial biomass carbon with urease and invertase were 0.606 and 0.642, thus have indirect effects on soil organic carbon mineralization.