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3.2.2.1 Slope-Mulch Interactions <br />• a. 4:1 Slopes - North (Appendix B-1 through B-3) Controls on 4:1 <br />north plots maintained higher near-surface soil moisture than <br />either mulch (excelsior, straw) during the late spring-early <br />summer sampling period. Greater soil moisture was recorded at <br />depth for both mulches at the end of the season (November 4) <br />- than foz the control. The control and the straw mulch treat- <br />ment retained soil moisture at depth longer than the excelsior <br />treatment. <br />b. 4:1 Slopes - South (Appendix B-4 through B-6) <br />Early spring near-surface moisture was highest under the <br />control, following the pattern observed in the 4:1 north <br />plots. Soil moisture declined through time at approximately <br />the same rate for all mulch treatments. At least 10~ moisture <br />was recorded under the excelsior treatment throughout the <br />growing season. Ten percent moisture was recorded for the <br />control and straw treatments at the 5® depth on November 4; <br />none ras recorded under excelsior on the same date. <br />c. 2:1 Slopes -North (Appendix B-7 through B-9) <br />Early spring soil moisture was slightly higher under the <br />control than the two mulches. The decline in soil moisture <br />over time was similar for all treatments at the four depths. <br />The control treatment retained soil moisture at depth longer <br />than either the hydromulch or excelsior treatments. All three <br />treatments showed near-surface moisture of 10~-157. on <br />_ November 4. <br />d. 2:1 Slopes - South (Appendix B-10 through B-12) <br />Early spring (May 4) moisture at Scm was much higher under the <br />control than under the two mulches. Moisture levels declined <br />more rapidly over time under the excelsior mulch than the <br />control or hydromulch. Like the north slope, the control <br />retained deep soil moisture longer than either the hydromulch <br />or excelsior treatments. Ten, percent moisture was recorded <br />for the control and hydromulch treatments at 5 ® on November; <br />none was recorded for excelsior. <br />~• <br />14 <br />