Valuation and management of desert ecosystems and their services
Haojie Chen, Robert Costanza
Abstract
Based on different definitions, deserts may constitute 13% to 33% of the global terrestrial surface. This is larger than the area of tropical forests and all types of wetlands combined. However, desert ecosystems are among the least studied in terms of their ecosystem services (ES), especially those that arise from species and processes unique to deserts. There are numerous research gaps that need to be filled including: (1) ignorance of unique desert ES, as well as deserts’ special effects on ES; (2) limited application of sophisticated approaches for economic valuation of desert ES; and (3) lack of diverse approaches to values and valuation. Moreover, payment for ecosystem services (PES) schemes are often used to combat desertification rather than for conserving well-functioning deserts. Valuation of desert ES is crucial to implementation of PES through raising awareness of overlooked deserts, motivating investment, designing payment amounts, and estimating the social benefit-cost ratios of payments. In addition to market-based voluntary PES, common asset trusts (CATs) following Ostrom’s eight core design principles may also contribute to sustainable management of desert ecosystems. Future research should explore unique desert ES, investigate the relationships between desert ES and geosystem services, improve accuracy of economic valuation of desert ES, and integrate diverse perspectives of values. The research results may potentially aid in both combatting desertification and conserving important deserts.