分解袋法在湿地枯落物分解研究中存在的问题与对策

Existing Problems and Countermeasures of Litter Bag Technique Applied to Emergent Macrophyte Litter Decomposition in Wetland

分解袋法是研究湿地植物枯落物分解应用最广泛的方法,但在研究湿地挺水植物枯落物分解时存在一些问题。首先,容易忽视挺水植物立枯分解阶段;其次,在研究不同类型无脊椎动物和微生物的分解功能时,不同网孔的分解袋都一定程度地阻碍了无脊椎动物,而且不同网袋中微生物的数量和活性等生态性质不一定相同,因而分解袋法不利于区分不同功能群的无脊椎动物和微生物;另外,分解袋法实验周期长,工作量大,枯落物残留量测量不准确。今后要加强湿地挺水植物枯落物分解的机理研究,在此基础上改进实验方法。

The litter bag technique is the most popular method used in the research of litter decomposition of macrophytes in wetland ecosystem. However, there exist some problems as used in the research of emergent macrophyte decomposition. Firstly, it ignores the decomposition stage of standing litter. Secondly, when it is used to study the decomposition function of different types of invertebrates and microbes, many problems appear, such as some invertebrates are prevented from different mesh-bags to a certain degree, moreover, there are differences in the number and activity of microbes in different mesh-bags, thereby, it is difficult to distinguish the functions of different function groups of invertebrates and microbes. Thirdly, this technique costs much time and labor, and the measurement of remaining litter is not exact. In the end, the authors suggest that the mechanism of emergent macrophyte decomposition should be paid attention, and based on this the experimental methods could be improved.