Chapter Six - The Influence of Volcanic Tephra (Ash) on Ecosystems

Volcanic eruptions influence the majority of the Earth 's ecosystem from delicate dust input to thick deposits near the volcano. In this chapter, we are studying the influence of volcanic ash deposits on the land using recent volcanic eruption examples. "Tephra" is a generic name for volcanic substances in the air, but ash is limited to 1000 years. Alien species may severely hinder the recovery of ecosystems. The erosion process affects volcanic ash by redistributing volcanic ash, thereby reducing the thickness of volcanic ash in some areas, but there is also the possibility of erosion rates exceeding 100,000 tkm - 2 years. Dust input thick tephra deposits have a significant impact on agriculture, and the toxicity of F is common in volcanic areas. The soil formed from the volcanic ash-based matrix is ​​mainly Andisols, and its colloidal part consists mainly of short-range ordered minerals and metal-humus complex. Andisols are normally fertile soils with high carbon deposition capacity. Interdisciplinary long-term research on influence and correspondence of volcanic eruption

Several types of volcanic eruptions - lava, ash (ash, volcanic ash, volcanic eruption, volcanic rock), and various gases emitted from craters and cracks - have been distinguished by volcanologists. These are usually named after famous volcanoes where they are observed. Some volcanoes may show only one characteristic type of eruption during activity, but other volcanoes may show all types of volcanoes with a series of eruptions. There are three volcanic eruptions. The most noteworthy thing is the magmatic eruption. Magma eruption involves depressurizing gas in magma and advancing it. The Phratomagmatic volcanic eruption is another type of volcanic eruption caused by gas compression in magma, opposite to the process of magma activity.

Volcanic eruptions influence the majority of the Earth 's ecosystem from delicate dust input to thick deposits near the volcano. In this chapter, we are studying the influence of volcanic ash deposits on the land using recent volcanic eruption examples. "Tephra" is a generic term for volcanic substances in the air, but ash is limited to substances with particle size less than 2 mm. The effect of tephras depends on the properties of tephra, such as crystallinity, chemical composition, particle size. The interaction between the height of the vegetation and the depth of the sediment has a significant influence on the influence, and factors like surface roughness are also important. Low growth Arctic, Takayama, desert ecosystems are more sensitive than high vegetation and forests. Recovery time ranges from several years to over 1000 years. Alien species may severely hinder the recovery of ecosystems. Andisols are normally fertile soils with high carbon deposition capacity.

Volcanic ash is produced during volcanic eruptions and consists of pulverized coal, mineral, and volcanic glass fragments less than 2 mm (0.079 in) in diameter. The term volcanic ash is also commonly used to refer to all explosive eruptive substances (more precisely called tephra) containing particles larger than 2 mm. Volcanic ash is formed during an explosive volcanic eruption as dissolved gas in magma expands and escapes violently into the atmosphere. The power of escaping gas crushes the magma and pushes it into the atmosphere, where it solidifies into volcanoes and glass fragments. As magma erupts, ash will also be formed when magma comes in contact with water, causing water to vapor and causing magma to break. Once in the air, the ash will spread in the winds thousands of kilometers away.