论文部分内容阅读
比较了生长于淹水田间的水稻、稗草和异型莎草甲烷排放的生物学特性。结果表明，三种植物的甲烷排放量次序为稗草＞水稻＞异型莎草，前两者的甲烷排放量分别为后者的１１倍和８．４倍。但这个次序刚好与这三种植物根系甲烷形成活性的次序相反。观察了三种植物甲烷排放的日周期变化。稗草和水稻根际土壤的产甲烷活性高于非根际土壤，而异型莎草的根际和非根际土壤的产甲烷活性之间无明显差异。还观察到稗草和水稻的叶鞘和茎杆连接节处的间隙是甲烷逸入大气的主要途径，而异型莎草则未见有可供甲烷排放的间隙与气孔。
The biological characteristics of methane emissions from paddy, barnyardgrass and Shaped satirch grown in flooded fields were compared. The results showed that the order of methane emissions of three plants was barnyard grass> rice> shaped sedge, the former two methane emissions were 11 times and 8.4 times that of the latter respectively. However, this order is exactly the opposite of the order of methane-forming activity of the three plant roots. Daily changes in methane emissions from three plants were observed. The methanogenesis activities of R. solanacearum and rice rhizosphere soil were higher than those of non-rhizosphere soil, while there was no significant difference in methanogenesis activity between rhizosphere soil and non-rhizosphere soil of A. septempunctata. It was also observed that the gap between the leaf sheath and the stem connection of barnyardgrass and rice was the main pathway for methane to escape into the atmosphere while the sedge did not find gaps and pores for methane emission.