土ど壌じょう浸しん食しょく

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Meanings

soil erosion

Technical term for the process by which soil is worn away by water, wind, or other natural forces.

浸しん食しょく
浸食 is the general term for erosion (by water, wind, etc.), while 土壌浸食 specifically refers to soil erosion.
土ど砂しゃ崩くずれ
土砂崩れ is a landslide or mudslide, a sudden event, whereas 土壌浸食 is a gradual process.

土ど壌じょう浸しん食しょく
Standard kanji spelling for soil erosion; 浸食 suggests gradual wearing away.
土ど壌じょう侵しん食しょく
Variant using 侵 (invade/encroach); also seen in technical contexts.
土ど壌じょう侵しん蝕しょく
Uses the older 蝕 character; less common in modern writing.
土ど壌じょう浸しん蝕しょく
Mixed variant with 浸 and 蝕; rarely used.

Compound of 土壌 (soil) and 浸食 (erosion). The term is a direct combination of its components, with no irregular historical derivation.