在不断变化的世界里,河流生态系统的新陈代谢和碳生物地质化学

Overview

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.

Aquatic BiomeAquatic biomes are ecosystems found in water environments, including freshwater and marine systems. These biomes are classified based on salinity, water depth, temperature, and flow. Major types include rivers, lakes, wetlands, estuaries, coral reefs, and oceans. Aquatic biomes are vital for life on Earth as they support biodiversity, regulate climate, and provide resources like food and oxygen. Each biome is uniquely adapted to support species suited to water-based conditions,...

Ecosystems An ecosystem is a community of living organisms interacting with their physical environment. Ecosystems include biotic (living) components like plants, animals, and microorganisms, and abiotic (non-living) elements such as water, soil, and climate. These interactions create a dynamic balance where energy flows through food webs, and matter cycles through photosynthesis, decomposition, and nutrient cycling.Science and Engineering Practices (SEP): Analyzing and Interpreting Data...

Carbon CycleThe carbon cycle shows how carbon travels between the air, land, water, and living things. Plants take in carbon dioxide from the air during photosynthesis to make their food. Animals get carbon by eating plants, and they release carbon back into the air through respiration. When plants and animals die, decomposers break them down, returning carbon to the soil and air. Burning fossil fuels also adds carbon to the atmosphere. By studying the carbon cycle, scientists can better...

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.