Holdridge Life Zones Classification in New Caledonia Habitats

Description This dataset aims to represent, in geographic space, the distribution of life zones as first defined by Holdridge in 1947 and updated in 1967. Life zones are delineated through three parameters: Mean Annual Biotemperature (°C): This axis represents the average annual temperature, considering only temperatures above 0°C, as it influences biological activity. It determines the thermal regime of the environment. Annual Precipitation (mm): This axis measures the total annual precipitation, indicating moisture availability. It is crucial for determining the hydric regime and supporting different types of vegetation and ecosystems. Potential Evapotranspiration Ratio (PET): This axis is the ratio of potential evapotranspiration to annual precipitation. It reflects the balance between water demand and supply, indicating aridity or humidity levels and influencing vegetation types and ecosystem dynamics. We used a combination of WorldClim datasets (Biotemperature and potential evapotranspiration) and Météo-France Aurelhy datasets (Annual Precipitation) specifically designed for New Caledonia to produce the raster with a 1 km² resolution. Content This dataset was produced, analyzed, and verified using a combination of open-source software, including QGIS, PostgreSQL, PostGIS, Python, R and the GDAL library, all running on Linux. amap_raster_holdridge_nc.tif is a GeoTIFF, utilizing the WGS84 international coordinate system, and consists of a single band with three major classes coded as Dry life zone (rast = 1) Moist life zone (rast = 2) Rain life zone (rast = 3) holdridge_3classes_NC.png is an image illustrating the valid domain of life zones in New Caledonia and the classification used in the dataset. Limitations Strictly, the classification leads to five distinct classes (very dry, dry, moist, wet, and rain), but as the two extreme classes cover less than 0.5% of New Caledonia, we merged very dry and dry into the "dry" class, as well as wet and rain into the "rain" class as illustrated in the Figure holdridge_3classes_NC.png.数据集描述 本数据集旨在从地理空间维度，呈现霍尔德里奇（Holdridge）于1947年首次定义、并于1967年更新的生命地带（life zones）分布格局。生命地带的划定基于三项参数： 1. 年均生物温度（Mean Annual Biotemperature，单位：°C）：该指标表征仅统计0°C以上温度的年均温，直接影响生物活动水平，决定了区域环境的热状况。 2. 年降水量（Annual Precipitation，单位：mm）：该指标衡量全年总降水量，反映区域可获取的水分供给，是确定水文状况、支撑不同植被类型与生态系统的关键因素。 3. 潜在蒸散比（Potential Evapotranspiration Ratio，PET）：该指标为潜在蒸散量与年降水量的比值，可反映水分供需平衡关系，指示区域干旱或湿润程度，并对植被类型与生态系统动态产生影响。 本研究结合WorldClim数据集（生物温度与潜在蒸散量）以及专为新喀里多尼亚打造的法国气象局（Météo-France）Aurelhy数据集（年降水量），生成了分辨率为1 km²的栅格数据。 数据集内容 本数据集依托运行于Linux系统的开源软件完成制作、分析与校验，所用工具包括QGIS、PostgreSQL、PostGIS、Python、R以及GDAL库。 amap_raster_holdridge_nc.tif为GeoTIFF格式数据，采用WGS84国际坐标系，仅包含单波段，其编码的三大主要类别为： - 干旱生命地带（rast = 1） - 湿润生命地带（rast = 2） - 雨林生命地带（rast = 3） holdridge_3classes_NC.png为可视化图像，展示了新喀里多尼亚境内生命地带的有效分布范围与本数据集采用的分类方案。 数据集局限性 严格而言，该分类体系本应划分出5个独立类别（极干旱、干旱、湿润、湿润多雨、雨林），但由于两个极端类别（极干旱与湿润多雨）的覆盖面积不足新喀里多尼亚总面积的0.5%，因此本数据集将极干旱与干旱合并为"干旱"类别，同时将湿润多雨与雨林合并为"雨林"类别，具体分类方案详见图像holdridge_3classes_NC.png。