in particular area of land trampling by humans or cattle can lead to uneven distribution of plants
habitat destruction
could include deforestation or clearing of land for development of agriculture
pollution
acid rain can cause soils to become too acidic, killing some plants and inhibiting the growth of others
use of chemicals
chemicals used include pesticides, fungicides, herbicides, fertilisers and liming, these affect growth and distribution of plants and are likely to reduce biodiversity in natural habitats
over-harvesting
this depletes soil of nutrients, making it difficult for plants to grow
monoculture
involves growing only one type of plant in a particular field, which keeps depleting the soil of the same minerals, which are essential for healthy plant growth
