Chaparral and Desert are distinct biomes—often confused, fundamentally different.
| Aspect | Chaparral | Desert |
|---|---|---|
| Climate | Mediterranean: hot dry summer, cool wet winter. 300–800 mm rain. | Arid: <250 mm rain, extreme heat, high evaporation. |
| Vegetation | Dense evergreen shrubs (chamise, manzanita, scrub oak), sclerophyllous leaves, fire-adapted. | Sparse: cacti, succulents, xerophytes, ephemerals. Water-storing tissues. |
| Soil | Thin, rocky, nutrient-poor, weathered volcanic/sedimentary. | Sandy, gravelly, saline, low organic matter. |
| Fire | Natural, frequent (30–100 yr); plants resprout/seed bank. | Rare (fuel-limited); catastrophic when occurs. |
| Distribution | California, Mediterranean Basin, Central Chile, SW Australia, Cape SA. | Sahara, Arabian, Atacama, Gobi, Great Basin, Sonoran, Kalahari. |
| Productivity | Moderate (seasonal). | Very low. |
Chaparral = "Mediterranean shrubland" — winter rain, summer drought, fire ecology.
Desert = "Arid land" — precipitation < evaporation, unpredictable, specialized survival.
They can border each other (e.g., California transition zones) but function differently.