Laserfiche WebLink
<br />COLOWYO COAL COMPANY L.P. <br />YEAR 2000 REVEGETATION MONITORING <br />Samplers: Brian Boden and Zoe Miller <br />1. Frequency/Density Data for the 1999 Reclamation Areas <br />A frequency/density relationship method is used to assess the success of the first yeaz's growth <br />in a pazticulaz reclaimed azea. A 60cm x 60 cm squaze plot frame was placed randomly 250 times <br />throughout the 1999 East/West pit reclaimed area and the 1999 Section 16 reclaimed azea. <br />Occurrence of each species was determined and summarized on the following tables. Each table <br />lists the top twenty most abundant species, number of occurances/250, frequency and density. <br />The frequency and density numbers were determined statistically based on n = 250 and using the <br />pre-calculated frequency and density tables at a 90% confidence level. <br />2. Herbaceous Cover <br />Herbaceous cover and establishment of woody plants during the second and fourth growing <br />seasons is an important tool to determine initial revegetation success. In the summer of 2000, the <br />1996 and 1998 reclaimed lands were sampled for herbaceous cover and woody plant density. <br />There were two sample areas, one of which was the combined the East and West Pit azeas and <br />the other was Section 16. Procedures for sampling herbaceous cover included randomly <br />selecting points to extended a 50-meter transect. Along this transect we lowered a pin every half <br />meter and recorded the first hit by vegetative species, litter, rock or bate ground. In each azea, 15 <br />transects were initially taken in each 1996 and 1998 reclaim area. Once this data was compiled, <br />calculations were performed to determine if sample adequacy was met. The equation used to <br />calculate results is seen below. It was determined that adequate samples were taken, therefore <br />there was no need to complete further transects. <br />tzsZ <br />Where: <br />d = desved level of precision (0.1 the level of precision for estimate of the mean to be within 10% of the actual <br />mean). <br />x =sample mean <br />SZ =sample variance <br />For all sample adequacy formulas, each transect is considered 1 "N," therefore the initial T table value was 1.345 <br />with a degree of freedom of 14. <br />