中文摘要：

利用云贵高原1961-2005年9个日射站辐射和气候观测资料以及能见度观测资料等，采用数理统计方法，研究了该区域到达地表太阳总辐射量（以下简称总辐射）变化特征及其影响因子。结果表明：该区年总辐射的空间分布特点是西部高于东部，丽江站最高（6207MJ·m-2·a-1），遵义站最低（3340MJ·m-2·a-1）。1961-2005年间，该区6个站的年总辐射呈年际或年代际变化，但无线性变化趋势（P〉0．1），其余3个站（蒙自、贵阳、遵义）的年总辐射在1960年代至1980年代间呈显著下降趋势（P〈0．001），其后略有增加（蒙自）或增加明显（贵阳）。蒙自总辐射下降的主要原因是能见度降低，遵义下降则与总云量增加和能见度较低有关，贵阳总辐射下降则与总云量增加有关，总云量增加导致日照时数减少。总体而言，1961～2005年云贵高原总辐射的年际变化或年代际变化与总云量及日照时数有关，城市站（昆明、贵阳）日照时数随能见度降低而显著减少。

英文摘要：

The variation characteristics of the global radiation and the meteorological factors such as cloud cover, humidity, wind speed, visibility, and sunshine duration which may impact the global radiation over the Yunnan-Guizhou Plateau in the southwestern part of China were studied by mathematical statistics method, with which the data of nine radiation observation stations and about 200 weather stations from 1961 to 2005 were involved. The re- sults show that the spatial distribution characteristics of annual global radiation are higher in the western part than the eastern part, and the highest is at Lijiang station （6207 MJ·m-2·a-1 ）, the lowest is at Zunyi station （3340MJ·m-2·a-1 ）. The global radiations in six out of nine stations have no significant linear trend （P2〉0. 1） in interannual variation, but the other three stations （Mengzi, Guiyang, and Zunyi） have a significant decline （P〈0. 001） from the 1960s to the 1980s, and then followed by slight （Mengzi） or significant increasing （Guiyang）. The main reason of the global radiation declining in Mengzi may owe to the visibility decreasing, and that in Guiyang is con- cerned with the increasing total cloud cover which result in sunshine duration decreasing. The cloud cover increasing and visibility decreasing are the reasons of the global radiation decline in Zunyi. Overall, interannual or decadal time scale variations of the global radiation are relative to the cloud cover and sunshine duration on the Yunnan - Guizhou Plateau during 1961 - 2005. The sunshine duration at city stations （Kunming and Guiyang） decreased with visibility reducing.