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fragipan Horizons: Definition, Properties, Genesis, and Influence on Soil Behavior

Agricultural Sciences 2021年第12期12卷 1490-1507页

作者： Michael Aide Department of Agriculture Southeast Missouri State University Cape Girardeau MO USA

Many Missouri forest soils exhibit fragipans, which influence soil productivity, ecosystem services and land management. fragipan bearing soils tend to occur where loess thickness is moderate (1 to 2 meters) or where the soil profile exhibits evidence of mass wasting of weathered limestone residuum. Consensus is consolidating around the self-weight collapse of loess and residuum after repeated wetting and desiccation. The use of gravel as an indicator of parent material differences and its correlation with fragipan development is not perfectly aligned, thus although most fragipans do exhibit a bisequal soil profile, the placement of the lithologic discontinuity is difficult given mass wasting, eluviation-illuviation, side slopes, and other soil processes that contribute to increasing the bulk density and conferring strength. fragipan genesis is evolving;however, research involving Ecosystem Site Descriptions are a fusion of a land parcel’s soil properties, vegetational community, hydrology, and climate to guide land management. Ecological Site Descriptions associated with fragipan bearing soils are necessary, especially when making land management decisions.

关键词： fragipan Soil Genesis Soil Taxonomy Forest Soils Loess

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fragipan Horizon Changes Using Annual Ryegrass and Other Admendments

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Open Journal of Soil Science 2024年第6期14卷 388-397页

作者： Lloyd Murdock Anastasios Karathanasis Dottie Call Dana L. Dinnes Amitava Chatterjee Department of Plant & Soil Science University of Kentucky Lexington KY USA USDA-ARS National Laboratory for Agriculture and the Environment University Bldg Ames IA USA

A greenhouse experiment was conducted involving intact fragipan soil cores of 50 cm thickness after removing the topsoil horizons. The cores were maintained in moist condition throughout the experiment and received several treatments with various amendments for different periods ranging from 9 to 17 months. The amendments included annual ryegrass or Festulolium residues, powder limestone and various humate compounds alone or in combination with the grass residues. The results suggested a significant effect of ryegrass and Festulolium in reducing penetration resistance into the top 10 cm of the fragipan within 9 - 17 months, particularly when used in combination with certain humate materials such as Leonardite. Apparently, this is the result of the release of certain soluble organic compounds from the plant residues or the humate amendments that increase the solubility of Si and Al associated with the fragipan brittleness, thus decreasing the density of the compacted fragipan material.

关键词： fragipan fragipan Horizon fragipan Soils Changing the fragipan Annual Ryegrass Changes fragipan Festulolium Changes fragipan Amendments That Change the fragipan

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