Effects of agricultural management on the quantity and quality of soil organic matter in 0-100 cm - data from ten German long-term experiments.

Agricultural management can influence the quantity and quality of soil organic matter (SOM), thereby contributing to carbon (C) sequestration and climate change mitigation. The depth to which agricultural management practices affect SOM is uncertain. Soil depth can have an important influence on SOM dynamics, so it is important to consider depth effects to fully account for changes, particularly in soil organic C (SOC) stocks. This is particularly true when assessing C faming measures, which are becoming increasingly important due to climate change. We sampled and analysed the top metre of mineral arable soils from ten long-term experiments (LTEs) in Germany to quantify and qualify the depth-dependent effects on SOC stocks, C and nitrogen (N) content, the δ13C and δ15N signature and the C/N ratio of the soils due to common agricultural management practices: Mineral N fertilisation (only for SOC stocks), a combination of N, phosphorus (P) and potassium (K) fertilisation, irrigation, crop rotation with legumes, straw incorporation, farmyard manure (FYM) application, liming and reduced tillage. In addition, the effects of soil compaction (only for the SOC stocks) were analysed as a negative side-effect of agricultural management. The dataset includes metadata and research data on soil properties at 0-100 cm, e.g., mean annual temperature and precipitation, C and N content, SOC stocks, water content, texture data (sand, silt, clay), pH, δ13C and δ15N values. This table contains Data on Thuenen Soil3 Soil Organic Matter stable isotope 1.

Related datasets are listed in the metadata element 'Related Identifier'.
Dataset version 1.0

农业管理措施可影响土壤有机质（soil organic matter, SOM）的数量与质量，进而助力碳固存与气候变化减缓。目前，农业管理措施对土壤有机质影响的深度范围尚不明确。土壤深度对土壤有机质动态具有重要影响，因此若要全面解析土壤变化，尤其是土壤有机碳（soil organic carbon, SOC）储量的变化，必须考虑深度效应。在评估碳农业措施时尤其如此，而由于气候变化，这类措施的重要性与日俱增。本研究采集并分析了德国10个长期试验（long-term experiments, LTEs）的表层0~1 m矿质耕地土壤样品，以量化并定性分析常见农业管理措施对土壤SOC储量、碳与氮（nitrogen, N）含量、δ13C与δ15N同位素特征以及土壤C/N比的深度依赖性影响。涉及的常见农业管理措施包括：仅针对SOC储量的矿质氮肥施用、氮-磷（phosphorus, P）-钾（potassium, K）配施、灌溉、豆科作物轮作、秸秆还田、农家肥（farmyard manure, FYM）施用、石灰施用以及少耕。此外，本研究还分析了土壤板结（仅针对SOC储量）作为农业管理负面副作用所产生的影响。本数据集包含0~100 cm土层土壤属性的元数据与研究数据，具体包括年平均气温、降水量、碳与氮含量、SOC储量、土壤含水量、质地数据（砂粒、粉粒、黏粒）、pH值以及δ13C、δ15N数值。本表格包含图嫩（Thuenen）Soil3土壤有机质稳定同位素相关数据1。相关数据集已在元数据元素"Related Identifier"中列出。数据集版本：1.0