Study the plant population density by quadrat method

The document describes two methods for studying plant population density: the quadrant method and the mark-recapture method. The quadrant method involves dividing a study site into 1m x 1m quadrants and counting the number of individuals of different plant species in each quadrant. The density is then calculated as the total number of individuals divided by the total number of quadrants. The mark-recapture method involves trapping and marking a sample of animals, releasing them, trapping again and counting marked and unmarked individuals to estimate the total population size using the Peterson-Lincoln estimator.