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Although often inconspicuous, fungi occur in every environment on Earth and play very important roles in most ecosystems. Along with bacteria, fungi are the major decomposers in most terrestrial (and some aquatic) ecosystems, and therefore play a critical role in biogeochemical cycles [174] and in many food webs.
Fungi provide numerous ecosystem services that are essential in maintaining ecological environments and reducing the effects of climate change. [3] Fungi help facilitate the nutrient cycle and carbon cycle, act as a food source for humans and animals, regulate animals populations, and contribute to the degradation of various pollutants. [3]
Soil carbon storage is an important function of terrestrial ecosystems. Soil contains more carbon than plants and the atmosphere combined. [1] Understanding what maintains the soil carbon pool is important to understand the current distribution of carbon on Earth, and how it will respond to environmental change.
As ecosystems age this supply diminishes, making phosphorus-limitation more common in older landscapes (especially in the tropics). [20]: 287–290 Calcium and sulfur are also produced by weathering, but acid deposition is an important source of sulfur in many ecosystems. Although magnesium and manganese are produced by weathering, exchanges ...
Fungi, acting as decomposers, are important in today's terrestrial environment. During the Carboniferous period, fungi and bacteria had yet to evolve the capacity to digest lignin, and so large deposits of dead plant tissue accumulated during this period, later becoming the fossil fuels. [9]
By decomposing these molecules, fungi play a critical role in the global carbon cycle. Fungi and other organisms traditionally recognized as fungi, such as oomycetes and myxomycetes (slime molds), often are economically and socially important, as some cause diseases of animals (including humans) and of plants. [10]
Fungi contribute to nutrient cycling [32] and nutritionally rearrange patches of ecosystem creating niches for other organisms. [33] In that way fungi in growing dead wood allow xylophages to grow and develop and xylophages , in turn, affect dead wood, contributing to wood decomposition and nutrient cycling in the forest floor .
Fungi spread underground by sending long thin threads known as mycelium throughout the soil; these threads can be observed throughout many soils and compost heaps. From the mycelia the fungi is able to throw up its fruiting bodies, the visible part above the soil (e.g., mushrooms, toadstools, and puffballs), which may contain millions of spores.