Fertility and desorption capacity of Anthrosols (Archaeological Dark Earth - ADE) in the Amazon: The role of the ceramic fragments (sherds)
Abstract Numerous patches of black soil can be found throughout the Amazon basin, primarily along the margins of rivers. This type of soil is known as Archaeological Dark Earth (ADE) and is formed as a result of prehistoric human occupation and classified as Anthrosols. The chemical characteristics of ADE are distinct from those of the region's predominant soils, making them popular with local subsistence farmers. The patches of ADE are characterized by an abundance of ceramic fragments (sherds) (CF) both on the surface of the patches and within their inner depths. Considering that these sherds are generally composed of quartz, metakaolinite, feldspars, non-plastic materials, often with high levels of aluminum phosphates, the present study focused on their potential contribution to maintenance to the fertility of ADE soils, under the conditions of tropical weathering. With this aim, the mineralogical composition of the sherds was obtained using X-ray diffraction with the support of SEM-EDS readings. In addition, some parameters of fertility were measured as well as phosphates dissolution in the presence of citric acid as a function of time. The nutrients and micronutrients were determined by atomic absorption spectrometry and the molybdenum blue method. The results showed that the fragments analyzed were composed of quartz, feldspars, metakaolinite, micas/illites, and anatase, but differ in the presence/absence of chlorites, talc, cristobalite, and calcites. This study characterized the sherds as highly fertile and provides experimental confirmation that the sherds release phosphor under conditions approximating the natural weathering environment, which indicates that they are an important potential source of nutrients. Highlights The nutrients and micronutrients were determined. The sherds release phosphor. Minerals that contribute to the constitution of the sherds The sherds investigated may be seen in fact as fertile material.
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기