Biological soil crust

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Biological soil crust in Hovenweep National Monument.
Biological soil crust in Natural Bridges National Monument near Sipapu Bridge.

Biological soil crusts are communities of living organisms on the soil surface in arid- and semi-arid ecosystems. They are found throughout the world with varying species composition and cover depending on topography, soil characteristics, climate, plant community, microhabitats, and disturbance regimes. Biological soil crusts perform important ecological roles including carbon fixation, nitrogen fixation, soil stabilization, alter soil albedo and water relations, and affect germination and nutrient levels in vascular plants. They can be damaged by fire, recreational activity, grazing, and other disturbance and can require long time periods to recover composition and function. Biological soil crusts are also known as cryptogamic, microbiotic, microphytic, or crytobiotic soils.

Natural History[edit]

Biology and composition[edit]

Biological soil crusts are most often[citation needed] composed of fungi, lichens, cyanobacteria, bryophytes, and algae in varying proportions. These organisms live in intimate association in the uppermost few millimeters of the soil surface, and are the biological basis for the formation of soil crusts.

Cyanobacteria

Main article: Cyanobacteria

Cyanobacteria are the main[citation needed] photosynthetic component of biological soil crusts, in addition to other photosynthetic taxa such as mosses, lichens, and green algae. The most common[citation needed] cyanobacteria found in soil crusts belong to large filamentous species such as those in the genus Microcoleus. These species form bundled filaments that are surrounded by a gelatinous sheath of polysaccharides. These filaments bind soil particles throughout the uppermost soil layers, forming a 3-D net-like structure that holds the soil together in a crust. Other common cyanobacteria species are as those in the genus Nostoc, which can also form sheaths and sheets of filaments that stabilize the soil. Some Nostoc species are also able to fix atmospheric nitrogen gas into bio-available forms such as ammonia.

Bryophytes

Main article: Bryophyte

Bryophytes in soil crusts include mosses and liverworts. Mosses are usually classified as short annual mosses or tall perennial mosses. Liverworts can be flat and ribbon-like or leafy. They can reproduce by spore formation or by asexual fragmentation, and photosynthesize to fix carbon from the atmosphere.

Lichens

Main article: Lichen

Lichens are often distinguished by growth form and by their photosymbiont. Crust lichens include crustose and aerolate lichens that are appressed to the soil substrate, squamulose lichens with scale- or plate-like bodies that are raised above the soils, and foliose lichens with more “leafy” structures that can be attached to the soil at only one portion. Lichens with algal symbionts can fix atmospheric carbon, while lichens with cyanobacterial symbionts can fix nitrogen as well. Lichens produce many pigments that help protect[citation needed] them from radiation.

Free-living Fungi

Microfungi in biological soil crusts can occur as free-living species, or in symbiosis with algae in lichens. Free-living microfungi often function as decomposers, and are a major[citation needed] contributor to soil microbial biomass. Many microfungi in biological soil crusts have adapted to the intense light conditions by evolving the ability to produce melanin. Fungal hyphae can bind soil particles together.

Free-living green algae

Main article: Green algae

Green algae in soil crusts are present just below the soil surface where they are partially protected from UV radiation. They become inactive when dry and reactivate when moistened. They can photosynthesize to fix carbon from the atmosphere.

Formation and succession[edit]

Biological soil crusts are formed in open spaces between vascular plants. Frequently, single-celled organisms such as cyanobacteria or spores of free-living fungi colonize bare ground first. Once filaments have stabilized the soil, lichens and mosses can colonize. Appressed lichens are generally earlier colonizers or persist in more stressful conditions, while more three-dimensional lichens require long disturbance-free growth periods and more moderate conditions. Recovery following disturbance varies. Cyanobacteria cover can recover by propagules blowing in from adjacent undistrubed areas rapidly after disturbance. Total recovery of cover and composition occurs more rapidly in fine soil textured, moister environments (~20 years) and more slowly (>1000 years) in coarse soil textured, dry environments. Recovery times also depend on disturbance regime, site, and availability of propagules.

Distribution[edit]

Geographical range[edit]

Biological soil crusts are found on almost all soil types, but are more commonly found in arid regions of the world where plant cover is low and plants are more widely spaced. This is because crust organisms have a limited ability to grow upwards and cannot compete for light with vascular plants. Across the globe, biological soil crusts can be found on all continents including Antartica.[1]

Variation throughout range[edit]

The species composition and physical appearance of biological soil crusts vary depending on the climate, soil, and disturbance conditions. For example, biological soil crusts are more dominated by green algae on more acidic and less salty soils, whereas cyanobacteria are more favored on alkaline and haline soils. Within a climate zone, the abundance of lichens and mosses in biological soil crusts generally increases with increasing clay and silt content and decreasing sand. Also, habitats that are more moist generally support more lichens and mosses.

The morphology of biological soil crust surfaces can range from smooth and a few millimeters in thickness to pinnacles up to 15cm high. Smooth biological soil crusts occur in hot deserts where the soil does not freeze, and consist mostly of cyanobacteria, algae, and fungi. Thicker and rougher crusts occur in areas where higher precipitation results in increased cover of lichen and mosses, and frost heaving of these surfaces cause microtopography such as rolling hills and steep pinnacles. Due to the intense UV radiation present in areas where biological soil crusts occur, biological soil crusts appear darker than the crustless soil in the same area due to the UV-protective pigmentation of cyanobacteria and other crust organisms.[1]

Ecology[edit]

Ecosystem function and services[edit]

Biogeochemical cycling[edit]

Carbon cycling Biological soil crusts contribute to the carbon cycle through respiration and photosynthesis of crust microorganisms which are active only when wet. Respiration can begin in as little as 3 minutes after wetting whereas photosynthesis reaches full activity after 30 minutes. Some groups have different responses to high water content, with some lichens showing decreased photosynthesis when water content was greater than 60% whereas green algae showed little response to high water content.[2] Photosynthesis rates are also dependent on temperature, with rates increasing up to approximately 28 °C (82 °F).

Estimates for annual carbon inputs range from 0.4 to 37 g/cm*year depending on successional state.[3]Estimates of total net carbon uptake by crusts globally are ~3.9 pg/year (2.1-7.4 pg/year).[4]

Nitrogen cycling Biological soil crust contributions to the nitrogen cycle varies by crust composition because only cyanobacteria and cyanolichens fix nitrogen. Nitrogen fixation requires energy from photosynthesis products, and thus increase with temperature given sufficient moisture. Nitrogen fixed by crusts has been shown to leak into surrounding substrate and can be taken up by plants, bacteria, and fungi. Nitrogen fixation has been recorded at rates of 0.7-100kg/ha*year, from hot deserts in Australia to cold deserts.[5] Estimates of total biological nitrogen fixation are ~ 49 Tg/year (27-99 Tg/year).[6]

Geophysical and geomorphological properties[edit]

Soil stability

Soils in arid regions are slow-forming[citation needed] and easily eroded. Crust organisms contribute to increased soil stability where they occur. Cyanobacteria have filamentous growth forms that bind soil particles together, and hyphae of fungi and rhizines/rhizoids of lichens and mosses also have similar effects. The increased surface roughness of crusted areas compared to bare soil further improves resistance to wind and water erosion. Aggregates of soil formed by crust organisms also increase soil aeration and provide surfaces where nutrient transformation can occur.[7]:181-89

Soil water relations

The effect of biological soil crusts on water infiltration and soil moisture depends on the dominant crust organisms, soil characteristics, and climate. In areas where biological soil crusts produce rough surface microtopography, water is detained longer on the soil surface and this increases water infiltration. However, in warm deserts where biological soil crusts are smooth and flat, infiltration rates can be decreased.[2]

Albedo

The darkened surfaces of biological soil crusts decreases soil albedo (a measure of the amount of light reflected off of the surface) compared to nearby soils, which increases the energy absorbed by the soil surface. Soils with well-developed biological soil crusts can be over 12 °C (54 °F) warmer than adjacent surfaces. Increased soil temperatures are associated with increased metabolic processes such as photosynthesis and nitrogen fixation, as well as higher soil water evaporation rates and delayed[citation needed] seedling germination and establishment. The activity levels of many arthropods and small mammals are also controlled by soil surface temperature.[7]

Dust-trapping

The increased surface roughness associated with biological soil crusts increase the capture of dust. These Aeolian deposits of dust are often enriched in plant-essential nutrients, and thus increase both the fertility and the water holding capacity of soils.[7]

Role in the biological community[edit]

Effects on vascular plants[edit]

Germination and establishment

The presence of biological soil crust cover can differentially inhibit or facilitate plant seed catchment and germination. The increased microtopography generally increases the probability that plant seeds will be caught on the soil surface and not blown away. Differences in water infiltration and soil moisture also contribute to differential germination depending on the plant species. It has been shown that while some native desert plant species have seeds with self-burial mechanisms can establish readily in crusted areas, many exotic invasive plants do not. Therefore, the presence of biological soil crusts may slow the establishment of invasive plant species such as cheatgrass (Bromus tectorum).[8]

Nutrient levels

Biological soil crusts do not compete with vascular plants for nutrients, but rather have been shown to increase nutrient levels in plant tissues, which results in higher biomass for plants that grow near biological soil crusts. This can occur through N fixation by cyanobacteria in the crusts, increased trapment of nutrient-rich dust, as well as increased concentrations of micronutrients that are able to chelate to the negatively-charged clay particles bound by cynaobacterial fillaments.[7]

Effects on animals[edit]

The increased nutrient status of plant tissue in areas where biological soil crusts occur can directly benefit herbivore species in the community. Microarthropod populations also increase with more developed crusts due to increased microhabitats produced by the crust microtopography.[2]

Human impacts and management[edit]

Human disturbance[edit]

Biological soil crusts are extremely susceptible to disturbance from human activities. Compressional and shear forces can disrupt biological soil crusts especially when they are dry, leaving them to be blown or washed away. Thus, animal hoof impact, human footsteps, off-road vehicles, and tank treads can remove crusts and these disturbances have occurred over large areas globally. Once biological soil crusts are disrupted, wind and water can move sediments onto adjacent intact crusts, burying them and preventing photoysnthesis of non-motile organisms such as mosses, lichens, green algae, and small cyanobacteria, and of motile cyanobacteria when the soil remains dry. This kills remaining intact crust and causes large areas of loss.

Invasive species introduced by humans can also affect biological soil crusts. Invasive annual grasses can occupy areas once occupied by crusts and allow fire to travel between large plants, whereas previously it would have just jumped from plant to plant and not directly affected the crusts.[7]

Climate change affects biological soil crusts by altering the timing and magnitude of precipitation events and temperature. Because crusts are only active when wet, some of these new conditions may reduce[citation needed] the amount of time when conditions are favorable for activity. Biological soil crusts require stored carbon when reactivating after being dry. If they do not have enough moisture to photosynthesize to make up for the carbon used, they can gradually deplete carbon stocks and die.[9] Reduced carbon fixation also leads to decreased nitrogen fixation rates because crust organisms do not have sufficient energy for this energy-intensive process. Without carbon and nitrogen available, they are not able to grow nor repair damaged cells from excess radiation.

Conservation and management[edit]

Removal of a stressors such as grazing or protection from disturbance are the easiest ways to maintain and improve biological soil crusts. Protection of relic sites that have not been disturbed can serve as reference conditions for restoration. There are several successful methods for stabilizing soil to allow recolonization of crusts including coarse litter application (such as straw) and planting vascular plants, but these are costly and labor-intensive techniques. Spraying polyacrylamide gel has been tried but this has adversely affected photosynthesis and nitrogen fixation of Collema species and thus is less useful. Other methods such as fertilization and inoculation with material from adjacent sites may enhance crust recovery, but more research is needed to determine the local costs of disturbance.[10]

In the media[edit]

In the movie Broken Arrow, Christian Slater's character Captain Riley Hale steps on a patch of biological soil crusts, to which Samantha Mathis's character Park Ranger Terry Carmichael scolds him for it and points out that its "endangered dirt".[11][12]

References[edit]

  1. ^ a b Rosentreter, R., M. Bowker, and J. Belnap. 2007. A Field Guide to Biological Soil Crusts of Western U.S. Drylands. U.S. Government Printing Office, Denver, Colorado.
  2. ^ a b c Belnap, Jayne, et al. 2001. Biological Soil Crusts: Ecology and Management. U. S. Department of Interior, Bureau of Land Management and U. S. Geological Survey. Technical Reference 1730-2. 118p. [1]
  3. ^ Housman, D.C., Powers, H.H., Collins, A.D., and Belnap J. 2006. Carbon and nitrogen fixation differ between successional stages of biological soil crusts in the Colorado Plateau and Chihuahuan Desert. Journal of Arid Environments 66: 620-634.
  4. ^ Elbert, W., Weber, B., Burrows, S., Steinkamp, J., Budel, B., Andreae, M. O., Poschl, U. 2012. Contribution of cryptogamic covers to the global cycles of carbon and nitrogen. Nature Geosci. 5(7): 459–462
  5. ^ Evans R. D. and Johansen J. R. 1999. Microbiotic Crusts and Ecosystem Processes. Critical Reviews in Plant Sciences 18(2): 183-225.
  6. ^ Elbert, W., Weber, B., Burrows, S., Steinkamp, J., Budel, B., Andreae, M. O., Poschl, U. 2012. Contribution of cryptogamic covers to the global cycles of carbon and nitrogen. Nature Geosci. 5(7): 459–462
  7. ^ a b c d e Belnap, J. (2003). The world at your feet: desert biological soil crusts. Front. Ecol. Environ., 1
  8. ^ L. Deines, R. Rosentreter, D.J. Eldridge, M.D. Serpe. Germination and seedling establishment of two annual grasses on lichen-dominated biological soil crusts. Plant Soil, 295 (2007), pp. 23–35
  9. ^ Belnap J, Phillips SL, Miller ME (2004) Response of desert biological soil crusts to alteration in precipitation frequency. Oecologia. DOI 10.1007/s00442-003-1438-6
  10. ^ Bowker, M. A. Biological soil crust rehabilitation in theory and practice: An underexploited opportunity. Restor. Ecol. 15, 13–23 (2007).[2]
  11. ^ Broken Arrow (1996), Quotes.net, [3]
  12. ^ 'The most beautiful place on Earth', Anthony C. LoBaido, 08/13/2005, WND News, [4]