The effect of eco-tourism and invasive species on threatened plants are important. Then determine the status and trends of rare and sensitive plant populations and habitat in order to help inform management decisions. Populations can be monitored by determining frequency of rare plants or canopy cover. You can also use statistical models of habitat use and demographic models. See: Journal of Applied Ecology 2004
41, 413–426, Managing threatened species: the ecological toolbox, evolutionary theory and declining-population paradigm. I hope this helps :-)
in describing the ecology of threatened plants, you will not only look at the plants in question but the associated flora and fauna and well. in that case, structural and species composition would be key and these could be linked to disturbances (both anthropogenic and natural).
Dear Rishad, - I agree with Judith Okello regarding the importance of the immediate neighborhood of a threatened species. See if this Open-Access paper and the literature cited in it helps: Diversity and Production in an Afromontane Forest. Forest Ecosystems 2016, 3:15 (doi:10.1186/s40663-016-0074-7). regards, KG