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Title: Impacts of Future Climate Change on California Perennial Crop Yields: Model Projections with Climate and Crop Uncertainties

Impacts of Future Climate Change on California Perennial Crop Yields: Model Projections with Climate and Crop Uncertainties Most research on the agricultural impacts of climate change has focused on the major annual crops, yet perennial cropping systems are less adaptable and thus potentially more susceptible to damage. Improved assessments of yield responses to future climate are needed to prioritize adaptation strategies in the many regions where perennial crops are economically and culturally important. These impact assessments, in turn, must rely on climate and crop models that contain often poorly defined uncertainties. We evaluated the impact of climate change on six major perennial crops in California: wine grapes, almonds, table grapes, oranges, walnuts, and avocados. Outputs from multiple climate models were used to evaluate climate uncertainty, while multiple statistical crop models, derived by resampling historical databases, were used to address crop response uncertainties. We find that, despite these uncertainties, climate change in California is very likely to put downward pressure on yields of almonds, walnuts, avocados, and table grapes by 2050. Without CO{sub 2} fertilization or adaptation measures, projected losses range from 0 to >40% depending on the crop and the trajectory of climate change. Climate change uncertainty generally had a larger impact on projections than crop model uncertainty, although the latter was substantial for several crops. Opportunities more » for expansion into cooler regions are identified, but this adaptation would require substantial investments and may be limited by non-climatic constraints. Given the long time scales for growth and production of orchards and vineyards ({approx}30 years), climate change should be an important factor in selecting perennial varieties and deciding whether and where perennials should be planted. « less
Authors: ; ; ;
Publication Date:
OSTI Identifier:OSTI ID: 898436
Report Number(s):UCRL-JRNL-219785
TRN: US200706%%59
DOE Contract Number:W-7405-ENG-48
Resource Type:Journal Article
Resource Relation:Journal Name: agriculture and forest meteorology, vol. 141, N/A, December 11, 2006, pp. 208-218
Research Org:Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:USDOE
Country of Publication:United States
Language:English
Subject: 09 BIOMASS FUELS; 54 ENVIRONMENTAL SCIENCES; 60 APPLIED LIFE SCIENCES; AVOCADOS; CALIFORNIA; CLIMATE MODELS; CLIMATES; CROPS; CULTIVATION TECHNIQUES; FERTILIZATION; GRAPES; HEAT EXCHANGERS; ORANGES; PRODUCTION