三江平原小叶章湿地枯落物分解及其影响因子研究

Study on Litter Decomposition and Influence Factors in Calamagrostis Angustifolia Wetland in Sanjiang Plain

应用分解袋法对三江平原小叶章湿地枯落物的分解及其影响因子进行了研究,小叶章枯落物的失重率随时间递增,分解速率随时间递减。小叶章枯落物位于地下0～10cm处时,分解最快,失重率最大,分解速率也最大;越往深处,其分解越慢,失重率越小,分解速率越小。通过相关分析和主成分分析,确定了温度和湿度条件以及pH状况是影响小叶章湿地枯落物分解的主要环境因子;并采用单指数衰减模型对小叶章湿地枯落物的分解速率动态和残留率动态进行了模拟。

The litter decomposition and influence factors in Calamagrostis angustifolia wetland in Sanjiang Plain are studied using mesh bags. As time passed, the weight reduction rate is increasing and the decomposition rate is decreasing. The decomposition is faster when the litter in 0~10 cm, and slower when in the deeper. Using correlation analysis and primary components,the temperature-humidity condition and pH are the major environment factors which could affect the litter decomposition of Calamagrostis angustifolia wetland. The Olson's single exponent model was adopted to simulate the dynamic of the litter decomposition rate and the remnant rate.