Top 30 cm soil C org stocks, isotopic C org signature (13dC) and fine sediment content (silt and clay %) estimated in soil cores sampled in seagrass meadows around Australia [dataset]

This database contains data on top 30 cm soil biogeochemical properties from soil cores (minimum length of 30 cm) sampled in seagrass (n=201 cores) and adjacent unvegetated patches (n=39) around Australia.
Average biogeochemical properties per core along with information about type of environment, biotic characteristics and environmental conditions.
In particular, the variables included in sheet 1 are:
- Core ID (column A): core code
- Location (column B): name of the region of the sampling site.
- Latitude / Longitude (columns C, D): latitude and longitude
- Bioregion (column E): classified the sampling sites according to their location in Temperate-Southern Oceans and Tropical-Indo Pacific, following Short et al. (2007) classification.
- Coastal geomorphic setting (column F): classified sampling sites in estuarine settings, if influenced by riverine inputs, or coastal settings, in case located in open waters, no influence by rivers.
- Vegetated vs. bare (column G): refers to the vegetated vs. unvegetated condition of the sampling patch.
- Genus (column H): refers to the genus of the dominant species, in the case of vegetated patches.
- Species size (column I): classify vegetated sampling sites by the size of the dominat species in considering species of Posidonia and Amphibolis as large species, and those of Halodule, Halophila, Ruppia, Zostera, Cymodocea and Syringodium as small species (Kiminster et al., 2015).
- Water depth (m) (column J): depth of the sampling site. 0 for intertidal meadows.
- Dominant wind fetch (km) (column K): fetch in the direction of the dominant wind, calculated with ‘fetchR’ package, using the Australian coastline shapefile from GADM database (www.gadm.org, version 2.0) and the dominant wind for each location obtained from the Bureau of Meteorology (http://www.bom.gov.au/climate/data/). Fetch estimations are provided only for coastal locations or outer estuarine locations due to the spatial resolution of the Australian coastline.
- Air Tª (Cº)_Annual avg. (column L): Annual average air temperature from 1995-2005 at the sampling location, extracted from Australian Bureau of Meteorology: http://www.bom.gov.au/jsp/ncc/climate_averages/temperature/index.jsp.
- Solar exposure (MJ m-2)_Annual avg. (column M): Annual mean solar exposure extracted from 1990-2011, extracted from Australian Bureau of Meteorology:http://www.bom.gov.au/jsp/ncc/climate_averages/solar-exposure/index.jsp
- Rainfall (mm)_Decadal avg. (column N): Decadal average rainfall from 1996 to 2005 extracted from Australian Bureau of Meteorology: http://www.bom.gov.au/jsp/ncc/climate_averages/decadal-rainfall/index.jsp?maptype=1&period=9605&product=totals
- Deviation from natural state (column O): index to estimate the level of human pressure, calculated based on the intensity of land use (adapted from Lenzen, M., and S. A. Murray. 2006. A modified ecological footprint method and its application to Australia. Ecol. Econ. 37: 229–255.). Land use data was obtained from the Australian Bureau of Agriculture and Resource Economics and Sciences at https://data.gov.au/dataset/ds-dga-bba36c52-d5cc-4bd4-ac47-f37693a001f6/details
.
-Top 30 cm Corg stock (g cm-2) (column P): cumulative soil Corg stocks within the top 30 cm of soil (decompressed depth).
- Top 30 cm_13dC_avg (column Q): average Corg isotopic signature (d13C) within the top 30 cm of soil (decompressed depth).
- Top 30 cm_13dC_SE (column R): standard error of Corg isotopic signature (d13C) within the top 30 cm of soil (decompressed depth).
- Top 30 cm_% Silt & Clay_avg. (column S): average mud content (%) within the top 30 cm of soil (decompressed depth).
- Top 30 cm_% Silt & Clay_SE (column T): standard error of mud content (%) within the top 30 cm of soil (decompressed depth).

本数据库收录了澳大利亚周边海草生境（n=201个土芯）及相邻无植被斑块（n=39个土芯）中采集的、长度不低于30cm的土壤芯样的0~30cm表层土壤生物地球化学性质数据。
每份土芯的平均生物地球化学性质，连同生境类型、生物特征与环境条件相关信息一同收录。

具体而言，首个工作表中包含的变量如下：
- 土芯编号（A列）：土芯编码
- 采样区域（B列）：采样点所在区域名称
- 纬度/经度（C、D列）：采样点的纬度与经度
- 生物地理区（E列）：参照Short等人2007年的分类标准，依据采样点所处的温带南大洋（Temperate-Southern Oceans）与热带印度洋-太平洋（Tropical-Indo Pacific）区域进行分类
- 海岸地貌背景（F列）：依据采样点是否受河流输入影响进行分类：受河流影响的归为河口生境，不受河流影响、位于开阔水域的归为滨海生境
- 有植被 vs 无植被（G列）：表征采样斑块的有植被或无植被状态
- 属（H列）：针对有植被斑块，指优势物种的属级分类单元
- 物种体型（I列）：依据优势物种的体型对有植被采样点进行分类：将波喜荡草属（Posidonia）、安菲波草属（Amphibolis）归为大型物种，而将二药藻属（Halodule）、海菖蒲属（Halophila）、川蔓藻属（Ruppia）、大叶藻属（Zostera）、丝粉藻属（Cymodocea）以及针蔺藻属（Syringodium）归为小型物种（Kiminster等人，2015）
- 水深（米，J列）：采样点的水深，潮间带海草床记为0
- 优势风区长度（千米，K列）：主导风向方向上的风区长度，通过‘fetchR’软件包计算得到；计算所用数据包括GADM数据库（www.gadm.org，版本2.0）中的澳大利亚海岸线矢量文件，以及从澳大利亚气象局（Bureau of Meteorology，http://www.bom.gov.au/climate/data/）获取的各采样点主导风数据。由于澳大利亚海岸线的空间分辨率限制，仅滨海及河口外区域提供风区长度估算值
- 年平均气温（摄氏度，L列）：1995-2005年采样点的年平均气温，数据取自澳大利亚气象局（Bureau of Meteorology）：http://www.bom.gov.au/jsp/ncc/climate_averages/temperature/index.jsp
- 年平均太阳辐射量（兆焦/平方米，M列）：1990-2011年的年平均太阳辐射量，数据取自澳大利亚气象局（Bureau of Meteorology）：http://www.bom.gov.au/jsp/ncc/climate_averages/solar-exposure/index.jsp
- 十年平均降雨量（毫米，N列）：1996-2005年的十年平均降雨量，数据取自澳大利亚气象局（Bureau of Meteorology）：http://www.bom.gov.au/jsp/ncc/climate_averages/decadal-rainfall/index.jsp?maptype=1&period=9605&product=totals
- 自然状态偏离指数（O列）：用于评估人类活动压力水平的指数，基于土地利用强度计算得到（改编自Lenzen与Murray 2006年的研究：A modified ecological footprint method and its application to Australia. Ecol. Econ. 37: 229–255.）。土地利用数据取自澳大利亚农业与资源经济科学局（Australian Bureau of Agriculture and Resource Economics and Sciences），来源链接为https://data.gov.au/dataset/ds-dga-bba36c52-d5cc-4bd4-ac47-f37693a001f6/details
- 0~30cm表层土壤有机碳储量（克/平方厘米，P列）：0~30cm土层（经解压校正后的深度）内的累积土壤有机碳储量
- 0~30cm表层土壤δ¹³C平均值（Q列）：0~30cm土层（经解压校正后的深度）内的土壤有机碳同位素δ¹³C平均值
- 0~30cm表层土壤δ¹³C标准误差（R列）：0~30cm土层（经解压校正后的深度）内的土壤有机碳同位素δ¹³C的标准误差
- 0~30cm表层土壤粉粒与黏粒平均占比（百分比，S列）：0~30cm土层（经解压校正后的深度）内的泥质含量（%）平均值
- 0~30cm表层土壤粉粒与黏粒占比标准误差（T列）：0~30cm土层（经解压校正后的深度）内的泥质含量（%）的标准误差