{"id":2877,"date":"2025-10-23T15:57:00","date_gmt":"2025-10-23T15:57:00","guid":{"rendered":"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/?p=2877"},"modified":"2025-10-29T18:17:41","modified_gmt":"2025-10-29T18:17:41","slug":"amazon-forest-carbon-sandy-soils-fieldwork","status":"publish","type":"post","link":"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/2025\/10\/23\/amazon-forest-carbon-sandy-soils-fieldwork\/","title":{"rendered":"Fieldwork Investigates Forest Carbon, Structure, and Composition on Sandy Soils in Southern Amazonia"},"content":{"rendered":"\n<p>Amazonian rainforests play an important global role in maintaining biodiversity, regulating climate, generating rainfall, and storing carbon. Yet, despite their importance, these forests continue to face multiple forms of degradation. <\/p>\n\n\n\n<!--more-->\n\n\n\n<p>The southern edge of the Amazon\u2014often called the <em>\u201cArc of Deforestation\u201d<\/em>\u2014is a region of particular concern. This area marks a transition between the Amazon and the Cerrado and is dominated by forests growing on nutrient-poor sandy soils that experience severe water stress during droughts.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Understanding Forest Variation on the Amazon\u2019s Southern Edge<\/h3>\n\n\n\n<p>A central research question is:<br><strong>What drives variation in the structure and composition of Amazonian forests on the southern edge, particularly in vulnerable forests with sandy soils?<\/strong><\/p>\n\n\n\n<p>To explore this, <strong>Amauri Barradas<\/strong>, a PhD candidate in the <strong>Postgraduate Program in Ecology and Conservation (PPG-EC)<\/strong> at the <strong>State University of Mato Grosso (UNEMAT)<\/strong>, is conducting extensive fieldwork in southern Amazonia. He is supervised by <strong>Prof. Ben Hur Marimon<\/strong> and <strong>Prof. Ted Feldpausch<\/strong>. This research forms part of both the <strong>Amazon SOS Project<\/strong> and the <strong>Amazon PyroCarbon Project<\/strong>.<\/p>\n\n\n\n<p>Fieldwork is taking place in forest reserves on <em>fazendas<\/em> (farms) near <strong>Alta Floresta, Mato Grosso, Brazil<\/strong>, where Amauri and his team are collecting detailed data on vegetation, roots, and soils.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Digging Deeper: Investigating Roots, Soils, and Carbon<\/h3>\n\n\n\n<p>A major component of the fieldwork involves laboriously excavating soil trenches to sample soil and root systems. From these trenches, the team measures <strong>soil and root density, nutrient content, and carbon stocks<\/strong>. They also look for <strong>charcoal fragments<\/strong>, which can reveal evidence of past fires, and collect <strong>leaf and soil samples<\/strong> to identify plant species and analyse their chemical properties.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"236\" height=\"316\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-18.png\" alt=\"\" class=\"wp-image-2925\" style=\"width:266px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-18.png 236w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-18-224x300.png 224w\" sizes=\"(max-width: 236px) 100vw, 236px\" \/><figcaption class=\"wp-element-caption\">Figure: Sampling soil and roots in sandy soils in southern Amazonia<\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"230\" height=\"308\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-21.png\" alt=\"\" class=\"wp-image-2935\" style=\"width:265px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-21.png 230w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-21-224x300.png 224w\" sizes=\"(max-width: 230px) 100vw, 230px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"238\" height=\"316\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-20.png\" alt=\"\" class=\"wp-image-2933\" style=\"width:266px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-20.png 238w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-20-226x300.png 226w\" sizes=\"(max-width: 238px) 100vw, 238px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why This Research Matters<\/h3>\n\n\n\n<p>The <strong>carbon storage potential of sandy, low-fertility Amazonian soils<\/strong> remains poorly understood. In most tropical forests, high productivity is supported by rapid nutrient cycling and decomposition. However, in forests growing on sandy soils\u2014where nutrients and water are scarce\u2014many questions remain.<\/p>\n\n\n\n<p>Amauri\u2019s research aims to address key gaps, including:<\/p>\n\n\n\n<ul>\n<li><strong>What is the carbon stock in vegetation, and how does litterfall contribute to carbon fluxes?<\/strong><\/li>\n\n\n\n<li><strong>What are the main characteristics of root systems, particularly the fine surface roots that dominate nutrient uptake?<\/strong><\/li>\n\n\n\n<li><strong>How do the physicochemical properties of these sandy soils influence both aboveground and belowground carbon dynamics and forest composition?<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" \/>\n\n\n\n<h3 class=\"wp-block-heading\">Towards Better Understanding and Restoration<\/h3>\n\n\n\n<p>By combining new insights from this work with broader analyses of forest processes across Amazonian soil types, the research seeks to clarify the mechanisms shaping forest structure and function. This understanding could ultimately guide efforts to <strong>restore degraded ecosystems<\/strong> and identify ways to <strong>make low-fertility landscapes both ecologically resilient and economically viable<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"200\" height=\"356\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-23.png\" alt=\"\" class=\"wp-image-2941\" style=\"width:234px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-23.png 200w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-23-169x300.png 169w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><figcaption class=\"wp-element-caption\">Figure: PhD student Amauri Barradas sampling leaves to identify species and assess nutrients and properties.<br><\/figcaption><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"178\" height=\"318\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-25.png\" alt=\"\" class=\"wp-image-2945\" style=\"width:232px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-25.png 178w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-25-168x300.png 168w\" sizes=\"(max-width: 178px) 100vw, 178px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"238\" height=\"318\" src=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-24.png\" alt=\"\" class=\"wp-image-2943\" style=\"aspect-ratio:0.5625;object-fit:cover;width:233px;height:auto\" srcset=\"https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-24.png 238w, https:\/\/sites.exeter.ac.uk\/ted-feldpausch\/wp-content\/uploads\/sites\/257\/2025\/10\/image-24-225x300.png 225w\" sizes=\"(max-width: 238px) 100vw, 238px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Amazonian rainforests play an important global role in maintaining biodiversity, regulating climate, generating rainfall, and storing carbon. Yet, despite their importance, these forests continue to face multiple forms of degradation.<\/p>\n","protected":false},"author":999,"featured_media":2955,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5,9,13,17,19,71,83],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Fieldwork Investigates Forest Carbon, Structure, and Composition on Sandy Soils in Southern Amazonia - Ted Feldpausch Research Group<\/title>\n<meta name=\"description\" content=\"PhD student Amauri Barradas investigates Amazon forest structure on its southern edge, focusing on high-biomass forests on sandy soils. 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