Q1.
How do forests with rich and highly diverse flora and fauna work as a barrier and reduce the impact of disasters?
Answer
A biodiverse forest acts as three barriers at once — physical, biological and chemical. The chapter gives one worked example of each.
| Type of barrier | Example from the chapter | Mechanism |
|---|---|---|
| Physical | The 1999 super cyclone in Orissa: villages with more mangroves experienced less destruction | Dense mangrove roots and trunks break the force of wind and storm surge, and hold the sediment so the shoreline is not stripped away |
| Biological | Monkey Fever (Kyasanur Forest Disease, KFD) in the Western Ghats: rich biodiversity correlates with lower tick-borne disease risk | Many of the animals a tick feeds on are hosts in which the virus cannot replicate. The more such species there are, the more tick bites are "wasted" on dead-end hosts, so fewer infected ticks reach people |
| Chemical | Forest soils and plant roots; mangrove soils | Diverse microorganisms absorb, transform or break down pollutants, improving water quality; mangrove soils trap sediments and heavy metals, preventing pollution from spreading into oceans and rivers |
Why diversity and not just tree cover: in each case the protection comes from having many different kinds of organism doing overlapping jobs. A single-species plantation gives some wind break, but it has one root architecture, one set of soil microbes and one set of animal hosts. If a pest or a disease or a salt surge takes out that one species, the whole barrier fails at once. A diverse forest keeps working because when one species fails, others are still doing the job. That property has a name worth knowing: ecological redundancy, and it is what makes a diverse system stable.
Connect it forward: this is also the reason section 12.10 treats biodiversity loss as urgent. Losing species does not only reduce the number of names on a list — it thins out the barrier, and the damage shows up only when the next cyclone or outbreak arrives.