科尔沁沙地不同水分条件下植物叶凋落物CO_2释放研究

The Study on CO_2 Release of Leaf Litters in Different Water Conditions in Horqin Sandy Land

采用可以有效控制环境因子的室内土壤培养试验,对固定沙地土壤不同水分作用下叶凋落物释放CO2的情况进行了初步研究。结果表明:土壤CO2的释放量及凋落物的分解均与土壤干湿情况相关。在添加凋落物与不添加凋落物的处理中,培养前4天的低含水条件下CO2释放速率与中高含水处理相比差异均呈极显著,而4天以后不同水分条件下的释放速率无显著差异。在沙地中,土壤过于湿润或干旱均能够阻碍凋落物的分解。

This experiment uses laboratory soil incubation experiment that can control environment factor measures the effect on CO2 re- lease of leaf litters in different water content in fixed dunes. The results showed that ： Total CO2 release and litter decomposition were correla- ted to water content of soil. Whether litter added or not, CO2 release rate of low water content was significantly different from that of medium and high water contents in the first 4 days. In sand land, either wetness or dryness of soil imposed great influence on litter decomposition, because soil and litter CO2 release amount were significantly different from that of the water content.