ASA Southern Branch 2008 Annual Meeting
February 3-5, 2008
Dallas, TX
Global climate change has important effects on agricultural
production.� Local climatic trends are
difficult to predict, but short-term changes can affect livelihoods of agricultural
producers and consumers.� The objective of this study was to predict
short-term changes in air temperature and rainfall in a 233,000 km2
area of the south-central USA (portions of Arkansas, Kansas, Louisiana,
Missouri, Oklahoma, and Texas).� Maximum, minimum, and average air
temperatures, and total precipitation, were computed annually (1948-2001) from
daily records of 17 locations and analyzed by regression.� Air
temperature variables exhibited quadratic, concave-shaped responses across
years (P ≤ 0.06).� Highest predicted temperatures tended to
occur in 1948 or 2001, and lowest predicted temperatures occurred about 1975 to
1980.� Mean air temperature in 2001 was
about 0.1 oC cooler than in 1948.� There was a linear (P = 0.06) increase in predicted rainfall across years, from 1005 mm
in 1948 to 1158 mm in 2001.� The model
had considerable uncontrolled variation (R2
≤ 0.19) regardless of variable.�
There was little evidence from these variables of adverse short-term
climate trends for this region of the