Soil grid data for 4 agricultural fields in PT (ECe; soil organic carbon, pH)

Soil data collected in an agricultural area with annual crops in Portugal (Lezíria Grande). The data refers to soil properties of 63 soil samples collected at a depth of 0-20 cm, considering a regular sampling grid, in four fields with varying soil salinity (field areas between 2 and 34 ha). The samples were collected at a period when the soil was bare, following the harvest of the annual crops, and pictures of the soil surface were taken for eventual correction of corresponding remote sensing imaging. The data includes: soil organic carbon (SOC) (Walkley-Black method), soil water content, electric conductivity of the saturated soil paste (ECe), EC1:5, and pH1:5. The data may be representative of the soil conditions of the area, which is a highly productive agricultural low land, prone to the development of soil salinity as a result of the rise of saline groundwater and/or irrigation. The data can be used to establish relations between soil salinity (ECe) and other soil properties as well as build prediction models of the soil properties from remote sensing namely, for developing models for SOC prediction under the STEROPES project (WP5 (WP5-T3) and WP2 (WP2-T3)).The aim of the collected dataset was to be able to analyze the influence of soil salinity in SOC prediction from remote sensing. Data in the form of MS Excel files (xlsx), pictures of the soil surface in jpg. format.本数据集采集自葡萄牙莱齐里亚格兰德（Lezíria Grande）的一年生作物种植农业区。数据涵盖63份土壤样品的理化性质参数，采样深度为0-20 cm，采用规则网格布点法在4块土壤盐分条件各异的田块中采集，各田块面积介于2至34公顷之间。 采样时机为一年生作物收获后、土壤裸露的时段，同步拍摄了土壤表面照片，用于后续对应遥感影像的校正工作。 数据集包含以下测定指标：采用Walkley-Black法测定的土壤有机碳（soil organic carbon, SOC）、土壤含水量、饱和土壤浆体电导率（ECe）、1:5土水比浸提液电导率（EC1:5）以及1:5土水比pH值（pH1:5）。 该区域为高产农业低地，受含盐地下水上升及/或灌溉活动影响，易发生土壤盐渍化，本数据集可较好代表该区域的实际土壤状况。 本数据集可用于构建土壤盐分（ECe）与其他土壤性质之间的关联关系，同时可基于遥感数据建立土壤性质预测模型，例如STEROPES项目（WP5 (WP5-T3)与WP2 (WP2-T3)）框架下开发的土壤有机碳预测模型。本次采集数据集的核心目标为分析土壤盐分对遥感反演土壤有机碳预测精度的影响。 数据集以Microsoft Excel（xlsx）格式文件以及JPG格式的土壤表面照片形式存储。