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Effects of Pine Reproduction Cutting Systems on Soils and Understory Vegetation in Southeast Louisiana.

Sail erosion was studied after four regeneration cutting methods — clearcut, seed-tree, shelterwood, and selection — were applied to mature loblolly pine (Finus taeda L.) stands on Idlewild Experiment Station and Lee Memorial Forest, both in southeastern Louisiana. The major soils on Idlewild Experiment Station are Providence and Lexington silt loam and Ruston fine sandy loam, while the Ruston series is predom­ inant on Lee Memorial Forest with minor areas of Johnston mucky loam. Plots of 8-ha In size were used for the treatments. Each treatment was replicated twice at each location. Soil erosion on slopes was measured from permanent stakes located at three slope positions — top, middle, bottom — on each of six slopes within each 8-ha plot. Soil erosion off the slopes was measured by use of a small trap built across an individual drainage on each plot. Analysis of variance of erosion data on the slopes revealed that significant differences among treatments occurred during only three out of the 16 data periods at Idlewild — D8 (May 20), D9 (June 3), and D16 (September 9). The clearcut and selection treatments were significantly different from the other treatments during D8. The clearcut treatment had an average increase of 0.22 cm in soil elevation and the selection treatment had a decrease of 0.23 cm, compared to +0.03 cm for the seedtree and shelterwood treatments. During D9, the selection treatment was significantly different from the other treatments with an average increase of 0.13 cm compared to +0.05 cm for the seed-tree, +0.01 cm for