The technique that should be used to survey the grass ecosystem is by the Line interception method. In this method, the lateral extent of the plant and also the height of the grass is measured and thus this helps in the quantitative estimations. The grassland ecosystem is full of pasteur and this method of survey accounts for the relation between the surrounding environment with the grasses and also the rate of decomposition and many more factors can be surveyed using this technique.
A reference research paper of how this method is used is being attached. Hope it helps. Crocker, R.L. and Tiver, N.S. (1948), SURVEY METHODS IN GRASSLAND ECOLOGY. Grass and Forage Science, 3: 1-26. doi:10.1111/j.1365-2494.1948.tb00836.x
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