黑瞎子岛湿地及岛外林地土壤酶活性特征

CHARACTERISTICS OF SOIL ENZYME ACTIVITIES IN HEIXIAZI ISLAND WETLAND AND OUTLYING ISLAND FOREST.

土壤酶是一种生物催化剂,受生态系统环境的变化影响极度敏感,是土壤生态系统变化的预警和灵敏指标。黑瞎子岛西部于2008年归还我国,目前自然环境基本处于原生态状态,其土壤酶活性特征可以反映三江平原开发前的一些特征。本研究在黑瞎子岛内湿地与岛外林地采集土壤样品,分析了3种酶活性的分布特征,过氧化氢酶活性在0.06~0.76 mL(g·20 min)^-1,脲酶活性在0.46~4.72 mL(g·20 h)^-1,转化酶活性在0.12~5.51 mL(g·24 h)^-1。结果表明:①土壤含水量成为限制林地土壤酶活性的重要因子;②季节温度与枯落物的输入的交互作用对不同酶活性产生不同影响。

Soil enzyme is a kind of biocatalyst, which is extremely sensitive to the changes of ecosystem with the early warning and sensitive indicator of soil environment changes. The western part of Heixiazi Island was returned to China in 2008. At present, the natural environment is basically in the original ecological state, and its soil enzyme activity characteristics can trace some characteristics before the cultured of Sanjiang Plain. In this study, soil samples were collected from the Heixiazi island wetland and the woodland outside the island, and the distribution characteristics of three enzymes activity were analyzed. The catalase activity was between 0.06~0.76 mL(g·20 min)^-1, urease activity was 0.46~4.72 mL(g·24 h)^-1, the invertase activity was 0.12~5.51 mL(g·24 h)^-1,The results showed that:(1) Soil water content has become an important factor limiting soil enzyme activity in forest land;(2) The interaction between seasonal temperature and litter input has different effects for different enzyme activities.