Water level drawdown and perennial vegetation impact litter decomposition in the sediment of a eutrophic wetland in the Netherlands

Managed wetlands often lack natural dynamics, such as water level fluctuations that normally cause dry-wet cycles. Several dry years result in a (partial) water level drawdown, after which an excess of rainfall creates the wet phase. To mimic these natural cycles, a water level drawdown can be manually induced. However, this will have major consequences for the cycling of carbon and nutrients. Yet, it is hereto unknown how water level drawdown, and the associated changes in vegetation composition and environmental conditions, affect plant litter decomposition. In the sediment of a eutrophic wetland, we buried green and rooibos tea bags, and local reed litter within a full-factorial design of water level drawdown (yes or no) and perennial vegetation (yes or no) (n=9). Inundated conditions had lower temperature and higher  conductivity and moisture content in the sediment.  We found lower tea decay in the water level drawdown area, indicating more tea mass remaining after 90 days. The dec..., To study the impact of changing environmental conditions during a water level drawdown on organic matter breakdown, tea bags and reed litter bags were buried in a full-factorial design, covering the water level drawdown management conditions (yes or no) and the presence of perennial reed vegetation (yes or no), resulting in four location types. The use of both tea bags and reed litter bags allows for the comparison with other areas that have used the tea bag index and for a standardized comparison between the drawdown and non-drawdown area. The added value of the reed litter bags is that this is area-specific material and may thus respond differently to the local conditions. Discrepancies between the two methods may indicate that material from the area itself is more adapted to the disturbances that occur. Exclosures were built to protect the buried litter bags against herbivory and bioturbation at the locations with no perennial vegetation, that are prone to disturbance. In the water l..., , # Water level drawdown and perennial vegetation impact litter decomposition in the sediment of a eutrophic wetland in the Netherlands

[https://doi.org/10.5061/dryad.dbrv15fc4](https://doi.org/10.5061/dryad.dbrv15fc4)

## Description of the data and file structure

There are four data files in this dataset.

The first dataset contains the environmental conditions that were measured (\"Soil properties\"). This was done in the inundated locations using probes (Hach) and in the dry locations and in the reed vegetated locations this was done using a W.E.T. Sensor kit at three points in time. 

The second dataset contains the vegetation recordings that were made at the start of the experiment (Day 0 of burial). It contains the cover of the found plant species that were measured in a plot of 1x1 meter. 

The third dataset is the data for working with the tea bag index (TBI). This consists of the weights of the bags before and after burying them in the sediment and their weight after ashing. For...

# 水位下降与多年生植被对荷兰某富营养化湿地沉积物中植物残体分解的影响
https://doi.org/10.5061/dryad.dbrv15fc4

人工管理湿地往往缺乏自然动态过程，例如通常会形成干湿循环的水位波动。连续数年干旱会导致（部分）水位下降，随后过量降雨则会重新形成湿润阶段。为模拟这类自然循环，可通过人工方式诱导水位下降。然而这一操作会对碳与养分循环产生显著影响，但目前尚不清楚水位下降，以及由此引发的植被组成与环境条件变化，会如何影响植物残体分解过程。
本研究在富营养化湿地的沉积物中，采用水位下降（是/否）与多年生植被（是/否）的全因子实验设计（n=9），埋藏了绿茶袋、路易波士茶袋以及本地芦苇残体。淹水环境下的沉积物温度更低，而电导率与含水率更高。研究发现，水位下降区域的茶袋分解率更低，意味着90天后茶袋剩余质量更多。[原文截断]
本研究旨在探究水位下降过程中环境条件变化对有机质分解的影响，因此采用水位下降管控措施（是/否）与多年生芦苇植被存在状态（是/否）的全因子实验设计，埋藏茶袋与芦苇残体袋，最终形成四类样地。同时使用茶袋与芦苇残体袋，既可以与采用茶袋指数法的其他研究区域进行对比，也能实现水位下降区与非下降区之间的标准化比较。芦苇残体袋的附加价值在于其为区域特异性材料，因此对本地环境条件的响应可能有所不同。两种方法之间的差异或许表明，本地来源的残体更适应研究区域内发生的干扰。针对无多年生植被、易受干扰的样地，我们设置了围栏以保护埋藏的残体袋免受草食动物啃食与生物扰动。[原文截断]

## 数据与文件结构说明
本数据集包含4个数据文件。
第一个数据集为实测环境条件数据（"土壤属性"）。淹水环境样地的环境参数采用哈希（Hach）探头测定，干旱样地与芦苇植被样地则采用W.E.T.传感器套件，于三个时间点完成测定。
第二个数据集为实验起始时（残体埋藏第0天）的植被调查数据，包含在1米×1米样方中测得的所有发现植物物种的盖度。
第三个数据集为茶袋指数（TBI）相关分析数据，包含残体袋埋藏前后的质量以及灰化后的质量。[原文截断]