A wetland ecosystem service assessment tool; Development and application in a tropical peatland in Uganda
A wetland ecosystem service assessment tool; Development and application in a tropical peatland in Uganda
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DOI：
10.1016/j.ecolind.2019.04.019
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发表时间：
2019-08-01
影响因子：
6.9
通讯作者：
Smith, Jo U.
中科院分区：
文献类型：
--
作者：
Langan, Charlie;Farmer, Jenny;Smith, Jo U.
我们提出了一个调查和会计工具的方法发展，在东非热带湿地的生态系统服务建模缺乏适当的数据。该调查提供了一个实用的实地方法，快速表征环境，植被，土壤和水文特性的湿地使用嵌套的采样点和子地块程序。核算程序提供了简单的计算，结合这些调查数据与文献价值，以估计湿地提供的生态系统服务。湿地生态系统服务价值评估是基于土地覆盖类型的单位面积估算，并按每种土地覆盖的面积范围进行缩放。该工具在乌干达西南部Kashambya湿地综合体的60个地点进行了测试和部署。调查和核算程序的结果与湿地土壤、植被和水文特性的数据一起沿着。我们的结果显示了标准误差，表明虽然Kashambya湿地受到人为影响的广泛影响，但它仍然是一个巨大的水（7.0 +/- 1.3 m（3））和碳（0.5 +/- 0.04 Mt）储存库。湿地是一个巨大的水蒸气源（40 +/- 180 km（3）y（-1））和碳汇（3 +/- 4 k t y（-1））。通量估计的高度不确定性表明，需要根据调查工具获取的数据进一步建立生物物理模型。湿地提供的粮食生产服务价值为1 +/- 0.1 M y（-1）。研究结果表明，不同土地覆被类型下湿地生态系统服务功能变化显著，但不同土地覆被类型下湿地生态系统服务功能具有高度异质性。为了提高湿地生态系统服务评估的准确性，并研究土地管理和气候变化对湿地生态系统服务的影响，需要更多地了解空间动态。
We present the methodological development of a surveying and accounting tool created in response to a lack of appropriate data for modelling ecosystem services in tropical wetlands in East Africa. The survey provides a practical field methodology for quickly characterising the environmental, vegetation, soil and hydrological properties of a wetland using a nested sample site and sub-plot procedure. The accounting procedure provides simple calculations for combing these survey data with literature values to estimate ecosystem services provided by the wetland. The wetland ecosystem service assessment is based on per unit area estimates by land cover type, and scaled by areal extent of each land cover. The tool was tested and deployed in 60 locations within the Kashambya wetland complex, southwest Uganda. Results of the survey and accounting procedure are presented along with data on wetland soil, vegetation and hydrological properties. Our results, showing standard errors, demonstrate that while the Kashambya wetland has been extensively modified by anthropogenic influences, it remains a large store of water (7.0 +/- 1.3 m(3)) and carbon (0.5 +/- 0.04 Mt). The wetland is a large source of water vapour (40 +/- 180 km(3) y(-1)) and sink for carbon (3 +/- 4 k t y(-1)). The high uncertainty of flux estimates demonstrate the need for further biophysical modelling based upon the data captured by the survey tool. The wetland provides food production services valued as US$ 1 +/- 0.1 M y(-1). Our results show that ecosystem services provided by wetlands change significantly under different land cover, but high heterogeneity of ecosystem service provision exists within land cover classes. Greater understanding of spatial dynamics is required to improve accuracy of wetland ecosystem service assessments, and to examine the implications of land management and climate change on wetland ecosystem services.