THE PRIMARY STUDY OF THE GRAIN YIELD OF YUNNAN PROVINCE RESPONDING TO ENSO
分析了1952-1998年云南粮食产量与ENSO的关系，发现产量呈S型波动并与ENSO共振，ENSO通过影响温度导致产量出现5.2年和4.33年的周期变化。
This paper points out that Yunnan's grain yield shows a 'S' type variation, and has a significant resonance oscillation with ENSO, by analysing the SOI, temperature, rainfall and Yunna's grain yield from 1952 to 1998 years. Because of the influence of ENSO, Yunnan's grain yield shows both the cyclic variation of 5.2 years and 4.33 years. The variations of ENSO took place before Yunnan' s grain yield by 0.412 year and 0.024 year respectively. ENSO affected Yunnan's grain yield through influncing the temperature change mainly.