https://padlet.com/liyu4/5tzt2gsgonex90r4 Oxford - 2.2, 2.3, 2.4 en-us 2022-02-09 03:21:25 UTC 2022-02-09 03:44:16 UTC hello@padlet.com https://padlet.net/icons/png/1f342.png liyu4 https://padlet.com/liyu4/5tzt2gsgonex90r4/wish/2037019757 The loss of productivity and decline in fertility of land-based environments as a result of human activities.

3 Types of Land Degradation:
Soil Degradation

• loss of fertility of soil (often due to climate change)
• compaction by large machinery and hard-hooved animals
• acidity due to build up of fertilizer or loss of soil nutrients
• one of the greatest problems for Aus. is the build-up of salt in the topsoil (salinity) 

Soil Erosion

• when soil is gradually worn away by natural phenomena (eg. rivers, rain, waves)
• clearing trees for farming accelerate erosion
• cleared land is more vulnerable to wind erosion, gully erosion and sheet erosion
• much of Aus. is at risk of one or more types of erosion

Ecosystem Decline

• natural ecosystems such as forests and streams can also be degraded
• loss of vegetation, invasion of alien plant and animal pests or decline in quality of streams of rivers
• degradation of ecosystems can lead to desertification

]]> 2022-02-09 03:43:17 UTC https://padlet.com/liyu4/5tzt2gsgonex90r4/wish/2037019757