Scarcity of trees defines these water scarce Forests. Most of these in India are heavily populated or have number settlements which have contributed to their mistaken classification as urban land. Relatively low density of trees makes it difficult to classify them as forests. But nevertheless they contribute to ecosystems with carbon absorption capacity. 

The Dryland forests are generally classified as arid or hyper arid and contain varying degree of water and floral elements. These type of forests are widespread and due to weak tree cover are often usurped by settlers, urban colonizers and by industries. 

Water scarcity in these biomes does not mean complete absence of water rather the crucial element is present on surface. The biodiversity does support million of people. 

Ironically most arid tropical forests have turned into dryland after severe deforestation in countries like India.  Most of the agriculture takes place by using stored surface water during a suitable period.

It would be interesting to study wildlife prevailing in arid conditions. Most of the open country mammals and birds should be present in the dryland forests.

Interesting Reading on Dryland Agro Forestry