Before you dive into our soil science project, it might be useful to learn more about soils and the nematodes living in them. Feel free to reference this page as you work through the experiment and start thinking of potential research projects to carry out with the data from our community database.
Soil is a living system made of minerals, air, water, organic matter, and organisms. Most soils begin with the weathering of rock by water, wind, ice, temperature changes, and biological activity. Over time, these processes help transform parent material into soils that can support complex ecosystems.
Five major factors influence how soil forms: climate, organisms, relief or landscape, parent material, and time. Soil formation is ongoing, and soils continue to change as climate, biological activity, erosion, land use, and environmental conditions change.
The structure and appearance of soil can tell us a lot about how it behaves. Soil color can reflect mineral content, drainage, and organic matter. For example, red soils often contain iron oxides, while dark soils often contain more organic material. Soil texture describes the relative amounts of sand, silt, and clay. Sandy soils drain quickly, clay-rich soils hold more water, and loamy soils often support strong plant growth because they balance drainage, water retention, and nutrients.
Soil clumps, called peds, are formed when sand, silt, clay, organic matter, roots, microbes, and environmental processes bind particles together. Their shape and structure can help scientists understand soil formation, water movement, root growth, and ecosystem health.
Healthy soils support food production, water filtration, carbon storage, biodiversity, and ecosystem resilience. A single teaspoon of healthy soil may contain billions of microorganisms, along with fungi, protists, microscopic animals, and other forms of life. As a community scientist, you can help observe and document the living systems within soil in your own environment.
Soil health connects directly to climate resilience, agriculture, biodiversity, water quality, and human health. By studying soil organisms, moisture, pH, texture, and local environmental conditions, we can better understand how ecosystems respond to change and how communities can protect the living systems beneath our feet.
Nematodes are non-segmented roundworms found in many environments, including soil, freshwater, oceans, plants, animals, and humans. Most soil nematodes are very small, usually about 0.3 mm to 3 mm long, and are best viewed with a microscope or magnifying device.
Soil nematodes are important members of the soil food web. Different types feed on bacteria, fungi, plants, other nematodes, or small organisms. Because of these feeding roles, nematodes help scientists understand soil biodiversity, microbial activity, nutrient cycling, and ecosystem condition.
Nematodes contribute to nutrient cycling by feeding on bacteria, fungi, and other organisms, helping release nutrients into forms more readily available within the soil ecosystem. Some nematodes can damage crops by feeding on plant roots, but many others are considered beneficial indicators of healthy and active soil ecosystems.
Scientists study nematodes in ecology, agriculture, genetics, neurobiology, aging, development, and space biology. The model nematode Caenorhabditis elegans has been especially important in research because it is small, transparent, easy to study in the laboratory, and shares many basic biological pathways with other animals.
Unlike segmented earthworms, nematodes are unsegmented roundworms with relatively simple body plans and a fluid-filled body cavity that helps maintain their shape.
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