Near-infrared spectra for the AfSIS Sentinel Sites in Tanzania

The Africa Soil Information Service (AfSIS), was a project led by the Tropical Soil Biology and Fertility Institute (TSBF) of the International Center for Tropical Agriculture (CIAT), based in Nairobi, in collaboration with several partners including the World Agroforestry Centre (ICRAF). The AfSIS projectf aimed to narrow sub-Saharan Africa’s (SSA) soil information gap and provide a consistent baseline for monitoring soil ecosystem services. Sentinel sites were established and top- and subsoil samples were collected from each subplot at 0-20 cm and 20-50 cm depth increments, respectively, and pooled (composited) into one sample for each plot and depth, resulting in a total of 320 standard soil samples per sentinel site (Vågen et al., 2010). These samples were analyzed using near-infrared (NIR) spectroscopy. NIR spectral measurements were conducted through regional laboratories in eastern, southern and West Africa (Vågen et al., 2010). The NIR spectral laboratory network used standard instrumentation and standard operating procedures to ensure reproducibility of results among laboratories and over time (Vågen et al., 2010). The ICRAF laboratory provided technical backstopping and quality control for the network of NIR spectral laboratories. This is the complete dataset of the NIR spectra matched with the Sentinel Site sample details for all seven AfSIS sentinel sites sampled and analyzed in Tanzania in 2010. Reference: Vågen, T-G., Shepherd, K., Walsh, M., Winowiecki, L., Desta, L. and Tondoh, J. 2010. Soil health surveillance: Technical specifications. World Agroforestry Centre (ICRAF). Nairobi, Kenya.

非洲土壤信息服务（Africa Soil Information Service, AfSIS）是由位于内罗毕的国际热带农业中心（International Center for Tropical Agriculture, CIAT）下属热带土壤生物学与肥力研究所（Tropical Soil Biology and Fertility Institute, TSBF）牵头实施的项目，合作方包括世界农林中心（World Agroforestry Centre, ICRAF）等多家机构。本项目旨在填补撒哈拉以南非洲（sub-Saharan Africa, SSA）的土壤信息缺口，并为土壤生态系统服务监测提供统一基准基线。项目设立了哨兵样区，在每个样地的亚区分别采集0-20 cm与20-50 cm深度的表层及下层土壤样品，将同一样地同一深度的样品混合（复合）为单一样品，最终每个哨兵样区共获得320份标准土壤样品（Vågen等，2010）。上述样品通过近红外（NIR）光谱法开展分析，近红外光谱检测工作由东非、南非及西非的区域实验室完成（Vågen等，2010）。该近红外光谱实验室网络采用标准仪器设备与标准操作规程，以确保不同实验室间及不同检测周期的结果可复现（Vågen等，2010）。世界农林中心（ICRAF）实验室为该近红外光谱实验室网络提供技术支持与质量控制。本数据集涵盖2010年在坦桑尼亚采样并分析的全部7个非洲土壤信息服务哨兵样区的近红外光谱数据，以及对应哨兵样区的样品详细信息。参考文献：Vågen, T-G., Shepherd, K., Walsh, M., Winowiecki, L., Desta, L. and Tondoh, J. 2010. Soil health surveillance: Technical specifications. World Agroforestry Centre (ICRAF). Nairobi, Kenya.