Peterson Fishhook random selection for mortality

This is an Excel spreadsheet, containing all trees in the Fishhook site. For each tree, a random number between zero and unity is assigned for each of 20 separate iterations; the random number for each iteration is a separate column with the headings "Rand1", "Rand2", "Rand3", etc. These numbers form the basis of selection of trees for the 20 iterations of random selection of trees to simulate mortality. For example, at Fishhook 211 trees were fallen out of the 434 predisturbance trees. In iteration 1, the random numbers and associate trees (with coordinates) are sorted from smallest to largest, and the 211 trees with the lowest random numbers in column "Rand1" are selected to randomly simulate mortality; these are then input to the NDF algorithm. The same process is repeated 20 times, but because the random numbers are different in each column, the 211 trees selected in each of 20 iterations is a different subset of the predisturbance trees.本数据集为Excel格式表格，涵盖Fishhook样地内的全部林木。针对每株林木，20轮独立迭代各为其生成一个介于0至1之间的随机数；每一轮迭代对应的随机数单独作为一列，列标题依次为"Rand1"、"Rand2"、"Rand3"等。此类随机数为20轮林木随机遴选以模拟林木死亡的迭代过程提供了选择依据。例如，在Fishhook样地中，扰动前共有434株林木，其中211株发生了枯损。在第1轮迭代中，将随机数与附带坐标信息的关联林木按升序排序，选取"Rand1"列中随机数值最小的211株林木以随机方式模拟林木死亡，随后将该选中林木集输入NDF算法。上述流程将重复执行20次，由于每一列的随机数值均不相同，因此20轮迭代中每一轮选中的211株林木均为扰动前林木种群的不同子集。