湿地根际土壤碳矿化及相关酶活性分异特征

研究了中国三江平原小叶章湿地根际土壤基础呼吸速率及相关酶活性，以了解碳矿化及其相关酶活性空间分异特征。结果表明，β-葡萄糖苷酶、淀粉酶、纤维素酶均为碳循环的良好指示酶，它们均存在着显著的空间分异。从表层土向下，由根表土向外，碳矿化速率及其相关的各种酶活性均呈下降趋势。当从田间取出土壤样品时，土壤样品在取出后的最初阶段碳矿化速率较高，2．5h以后达到一个较为平稳的水平，然后呈平缓降低的趋势。β-葡萄糖苷酶、淀粉酶、纤维素酶是碳循环的真正催化剂，而土壤有机碳则是此反应的低物。

Carbon Mineralization and the Related Enzyme Activity of Soil in Wetland

The enzyme activity and carbon mineralization in the Calamagrostis angustifolia rhizosphere of soil in Sanjiang Plain, China, were investigated in order to understand the microbial effect on carbon mineralization in wetland soil. The results suggest that the β-Glucosidase, amylase and cellulase activities should be nice indicators for carbon cycling. The activities are high in the topsoil and low in the subsoil, decrease from rhizoplane soil to root-free soil for all three enzymes. Carbon is mineralized rapidly once separated from field, then decrease in a short term, and stable after 2.5 h. The enzymes in microorganism are real catalysts for carbon cycling.