三江平原小叶章湿地枯落物初期分解动态

通过4周淋洗分解试验，探讨了微生物活动和淋洗作用对三江平原沼泽湿地沼泽化草甸小叶章和湿草甸小叶章枯落物初期分解的影响.结果表明：两种小叶章植物初期分解的质量损失分别占当年分解物质损失量的59％和22％，28 d分解后枯落物残留量明显降低，并呈先快后慢的变化过程.两种枯落物中N、P含量均有明显下降，N含量分别下降了约3265%和2455%，P下降了36.71%和45.15％.抑制微生物处理的枯落物N、P含量较不抑制处理高，但差异不显著；抑制和不抑制微生物处理下枯落物释放到淋洗液N、P含量变化也不相同，但差异未达到显著水平.表明小叶章初期分解主要受淋洗作用的影响.两种小叶章植物的分解速率和养分损失速率差异均未达到显著水平.

Dynamics of initial decomposition of Calamagrostis angustifolia litter in Sanjiang Plain of China.

A 28-day leaching-decomposition experiment was conducted to study the effects of microbial activity and leaching on the initial decomposition of Calamagrostis angustifolia litters taken from the boggy meadow and meadow in Sanjiang Plain of China. The results showed that the mass loss of the litters at their initial decomposition stage accounted for 59% and 22% of yearly mass loss, respectively, and the remaining dry mass decreased significantly after 28-day decomposition. By the end of the experiment, the N content in the litters decreased by 32.65% and 24.55% , and P content decreased by 36.71% and 45.15%, respectively. The N and P contents in the litters treated with chloroform were higher than those of the control, but the difference was not significant. No significant difference was also observed in the N and P release from the litters to the leachates between the treatment of chloroform and CK, which indicated that the initial decomposition of the litters was mainly affected by leaching. There was no significant difference in the decomposition rate and nutrient loss rate between the two litters.