LBA-ECO LC-14 Modeled Soil and Plant Water Balance, Amazon Basin, 1995-2001

A simple GIS soil-water balance model for the Amazon Basin, called RisQue (Risco de Queimadasa -- Fire Risk), was used to conduct an analysis of spatial and temporal patterns of drought in moist tropical forests and the complex relationships between patterns of drought and forest fire regimes from 1995 through 2001.

The provided data products are the model output estimates of maximum plant-available soil water (PAWmax) at 10 m depth at 8 km resolution and model data inputs of monthly precipitation and evapotranspiration.

RisQue estimates PAWmax at 10 m depth starting with a map of PAWmax (1-2 m depth) developed using 1,565 RADAMBRASIL soil texture profiles and empirical relationships between soil texture and critical soil water parameters and then interpolated to 8 km resolution. In RisQue, plant-available soil water (PAW) is depleted by monthly evapotranspiration estimated using the Penman Monteith equation and satellite-derived radiation and recharged by monthly precipitation.

There are three data files with this data set, two *.zip, and one GeoTIFF image (.tif). The *.zip files expand to 83 *.asc files of evapotranspiration and 89 *.asc files for precipitation data. The image (.tif) is a map of maximum percent available water at 10 m depth. All the files in this data set are in standard arc/info asciigrid format at 8 km resolution.

本研究采用名为RisQue（Risco de Queimadasa -- 火险）的简单地理信息系统土壤-水分平衡模型，针对亚马逊盆地的湿润热带森林，在1995年至2001年期间对干旱的空间和时间模式进行了分析，并探讨了干旱模式与森林火灾制度之间的复杂关系。所提供的数据产品包括模型输出的最大植物有效土壤水分（PAWmax）在10米深度处的8公里分辨率估计值，以及模型数据输入的月降水量和蒸散量。
RisQue模型通过使用1,565个RADAMBRASIL土壤质地剖面和土壤质地与临界土壤水分参数之间的经验关系所开发的PAWmax（1-2米深度）地图，并以此为基础进行插值至8公里分辨率，从而估计10米深度的PAWmax。在RisQue模型中，植物有效土壤水分（PAW）通过使用Penman Monteith方程估计的月蒸散量而耗竭，并通过月降水量进行补给。
该数据集包含三个数据文件，两个*.zip文件和一个GeoTIFF图像文件（.tif）。*.zip文件展开后生成83个蒸发散量*.asc文件和89个降水量*.asc文件。图像文件（.tif）是10米深度处最大可用水分百分比的地图。数据集中所有文件均采用标准的arc/info asciigrid格式，分辨率为8公里。