Laserfiche WebLink
• sampled. These data were then utilized to evaluate the successfiilness of revegetation efforts with respect to <br />cover, forage production, species diversity, and shmb density. <br />Transact Locations. To ensm~e that all of the areas within the two Rangeland Reclamation Blocks, Cropland <br />Reclamation Block and Cropland Reference areas evaluated had an equal chance of being sampled, each <br />reclamation block was treated as a single sample unit and a totally randomized sampling effort was <br />implemented Utilizrug the GPS unit, the extreme north, south, east and west boundaries of each site sampled <br />were identified according to the 1927 Colorado State Plane Northam Zone (NAD 27) coordinate system. The <br />interval used in the state plane coordinate system is based on foot increments. Given the typical real-time <br />accuracy of this GPS unit of plus or minus 18 inches, all of the hansect locations were field located at a sub- <br />meter acc;rnacy. <br />Once the boundaries ofthe reclaimed area were identified, then a computer program which generates random <br />coordinates was used to locate the potential lransect location points. These coordinates were then entered into <br />the GPS unit and the transact location starting points were marked in the field. At each transact location <br />starling point, the Irarlsect direction was detemvned by selecting a random direction based on the degrees of <br />the compass (1 to 360°). Once the orientation of the trarrsect was detemuned, then the 50-meter tape was laid <br />out across the site. All hansects were kept within the reclaimed sample unit boundaries. In situations where the <br />trausect placement resulted in the trarlSeCt alignment crossing a sample unit boundary, the trar>,sect line was <br />backed up for that portion of the transec:t which crossed the boundary line 180 degrees. Where the 50-meter <br />tape could not be placed within a narrow reclaimed area due to boundary conshaints, then the irarrsect line was <br />changed 90 degrees at the point where the boundary line was crossed to ensure that the entire trausec:t <br />alignment was within the area to be sampled. <br />• Plant Cover. Plant cover was evaluated by sampling along an outstretched 50-meter tnu>.sect tape. Along <br />the outstretched tape, a total often previously identified and randomly selected intervals were selected as the <br />sample locations for sampling. These ten points were then used as the sample locations for collecting plant <br />cover. At each designated sample point, an inclined metalten-point fiarrre, one meter in height was positioned <br />perpendicular to the tape and a sharpened metal rod was dropped. Each sampling point was sampled at ten- <br />centimeterintervals along the ten-point frame. Even numbers where sampled on the right hand side of the tape <br />and odd numbers were sampled on the left hand side of the tape. <br />Each observation was recorded as to the specific plant species encountered as the rod was dropped. If no <br />plant cover was encountered, then the observation was recorded as to the presence of plant litter, rock, or <br />bare ground. Plant material produced in the 2004 growing season was considered as living plant material and <br />all plant material produced prior to the current growing season was considered to be litter. The 100 data <br />points collected along each transact were then s<urunvized into a single datum for purposes of <br />statistical analysis. Absolute and relative plant cover, species diversity, and plant life forms were detemvned <br />based upon the observations collected in sampling the plant cover. <br />As outlined in the Trapper Mine Permit and the Division's Guidelines, annual and biennial plant <br />cover in excess often percent of the total vegetative cover was excluded from the calculations of "allowable <br />cover." As directed by Trapper, litter in excess of the acceptable standard, cryptograms and rock were <br />excluded in calculating the values of "allowable cover." <br />• <br />