Wetland ecosystem services in California's Central Valley and implications for the Wetland Reserve Program

• Published in: Ecological applications 2011-04, Vol.21 (sp1), p.S18-S30
• Main Authors: Duffy, Walter G, Kahara, Sharon N
• Format: Article
• Language: English
• Subjects: Agricultural management; birds; California; Central Valley; Conservation programs; Floods; Freshwater; Habitat conservation; invertebrates; Nitrogen; Vernal pools; water quality; Waterfowl; Wetland conservation; Wetlands; Wildlife conservation
• ISSN: 1051-0761; 1939-5582
• DOI: 10.1890/09-1338.1

Primary ecosystem services provided by freshwater wetlands in the California Central Valley, USA, include water quality improvement, biodiversity support, and flood storage capacity. We describe these services for freshwater marshes, vernal pools, and riparian wetlands and the implications for wetlands restored under USDA programs in the Central Valley. California's Central Valley is a large sedimentary basin that was once covered by grasslands, extensive riparian forests, and freshwater marshes that today have been converted to one of the most intensive agricultural areas on earth. Remaining freshwater wetlands have been heavily altered, and most are intensively managed. Nitrogen loading from agriculture to surface and groundwater in the Central Valley was estimated to be 34.7 ×× 10 6 kg N/yr. Atmospheric deposition of nitrogen in the Central Valley was estimated to be 44.3 ×× 10 6 kg N/yr, of which ∼∼1.5 ×× 10 6 kg N/yr was introduced directly to wetlands. Our analysis indicates that wetlands enrolled in the USDA Wetland Reserve Program (WRP) may potentially denitrify the NO 3 -N load from relatively unpolluted source water in