Climatic changes in yield index and soil water deficit trends in China

Authors
Citation
A. Thomas, Climatic changes in yield index and soil water deficit trends in China, AGR FOR MET, 102(2-3), 2000, pp. 71-81
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Agriculture/Agronomy
Journal title
AGRICULTURAL AND FOREST METEOROLOGY
ISSN journal
0168-1923 → ACNP
Volume
102
Issue
2-3
Year of publication
2000
Pages
71 - 81
Database
ISI
SICI code
0168-1923(20000512)102:2-3<71:CCIYIA>2.0.ZU;2-I
Abstract
Long-term trends of the combined effects of evapotranspiration and precipit ation effect surface hydrology and soil water and consequently natural and agricultural ecosystems. This paper analyses yield index and soil water def icit time series derived from water balance calculations for multiple cropp ing systems with FAO methodology. The analysis shows that yield index value s have increased and soil water deficits have consequently decreased over m uch of China during 1954-1993. The likely parameters contributing to this t rend are precipitation changes north of 35 degrees N and maximum evapotrans piration as well as available soil water trends south of this line. Increas ing the assumed maximum soil water storage did not result in substantially different results. While this analysis indicates that regional climatic cha nge appears to have had a beneficial effect for several regions in China, p redictions from combined global climate model climate change experiments an ticipate decreasing yields due to decreased water availability by 2050 in t he same regions. (C) 2000 Elsevier Science B.V. All rights reserved.