摘   要漂浮植物是湿地植物的重要组成部分，具有较快的繁殖速率以及较高的环境耐受性，在城市湿地水质净化、农业生产等方面发挥着重要作用。然而，大量的漂浮植物覆盖水面可影响水下生物和非生物因子。湿地凋落物的分解受到生物和非生物因子的共同调控作用。但是对大量的漂浮植物覆盖水面是否会影响到湿地生态系统的凋落物分解这一过程，目前是未知的。本文以和睦湿地为研究平台，以早园竹为研究对象，应用野外凋落袋分解法研究了漂浮植物覆盖与湿地凋落物分解的关系。本研究得到如下主要结果：89635

1）漂浮植物覆盖可降低水体电导率（EC）、溶解氧（DO）、pH、水温(Tw)和硝态氮（NO3--N）；

2）漂浮植物覆盖可降低叶凋落物的生物量损失，且在孔径水平上保持一致；

3）叶凋落物生物量损失与水环境因子表现出较好的相关性。

以上结果表明：漂浮植物覆盖会对湿地凋落物分解这一重要生态系统功能产生影响，主要通过改变水环境因子引起的，水环境因子的改变可对分解者产生调控，进而影响凋落物分解。

毕业论文关键词：湿地；漂浮物；水环境因子；凋落物分解

Abstract Floating plant is an important part of wetland, which has fast reproduction rate and high tolerance to environment change and play an important role in water purification, agricultural production etc。。 However, the surface of water covered by excessive floating plant may have effect on biotic/abiotic factors under water, linking with wetland litter decomposition。 To the best of our knowledge, whether excessive floating plant covering the surface of water could affect wetland litter decomposition is currently unknown。 In this article, in Hangzhou Hemu wetland, Zhejiang province, China, we used the Phyllostachys propinqua to explore the effect of excessive floating plant covering the surface of water on wetland litter decomposition, and main research results as follows: 

(1) Floating plant covering on the surfaces of water can decrease the electrical conductivity (EC), dissolved oxygen (DO), pH, temperature (Tw) and nitrate nitrogen content (NO3--N)。

(2) Floating plant covering on the surfaces of water can decrease leaf litter biomass loss rate, and it is consistent with aperture level of litter bag。

(3) There is significant relationship between leaf litter biomass lose rate and water environmental factors。 源Q于W优E尔A论S文R网wwW.yOueRw.com 原文+QQ75201,8766

Form what we have mentioned above, floating plant covering on the surfaces of water really does affect wetland litter decomposition。 Excessive floating plant covering on the surfaces of water changes biotic/abiotic factors under water, which could regulate litter decomposition progress, then affect wetland litter decomposition。 

Keyword: Wetland; Floating plant; Water environmental factors; Litter decomposition

目录

1 研究的背景与意义 1

2 研究材料及方法 2

2。1研究区自然概况 2

2。1。1和睦湿地的地理位置： 2

2。1。2和睦湿地自然环境状况 3

2。1。3和睦湿地历史人文环境状况 3

2。2实验方法 3

2。2。1实验对象 3

2。2。2试验方法 3

2。2。3实验指标 4

2。3研究工作的步骤及进度 4

3 结果与分析