REN R314 Lecture Notes - Lecture 15: Microsite, Revegetation, Tillage

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Proposed ecological solution to soil restoration reset morphological soil development. Principles: retain surface soil horizons, retain organic matter, restructure physically altered soil with deep tillage. 20% of the root system of forests (based on total root length) is located below 20cm in the soil. Dozer rippers: the wetter the soil, the shallower the critical depth, critical depth limits effectiveness of rippers and other tinges. Loose soil reduces the stated penetration depth by ~1/2: generally not heavy enough. Because it maximizes the effectiveness of freeze/thaw process in several ways: Increases the melting of snow in early fall. Increases depth and rate of frost penetration: allows lateral expansion of soil during freezing. We want to minimize admixing of soil during tillage: admixing/homogenization of soil layers can be detrimental to forest productivity. Is current reclamation criteria and practices adequate: generally no, there is no criteria on restoring hydrologic function, forest restoration is more than soil restoration.

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