中文摘要：

利用贵州省太阳辐射的连续观测数据，初步确定了光合有效辐射与太阳总辐射的比例因子，并基于气候学估算模型，估算了贵州省2001年的光合有效辐射量，分析了其时空变化特征。结果表明：1）贵州省光合有效辐射与太阳总辐射的比例系数为0．45；2）全省年光合有效辐射的平均值约为1627．71MJ／m2，呈现自西向东、南、北3个方向递减的空间分布特征，与地势的变化大体一致；3）光合有效辐射的年内变化特征与气温变化较一致，7月份最高约为237．07MJ／m2，1月份最低约为78．52MJ／m2。

英文摘要：

Through statistical analysis on continuously observing data of solar radiation, the ratio factor of photosynthetically active radiation （PAR） to solar radiation is fixed; next, based on climatology estima- tion model, the PAR quantity of Guizhou province in 2001 is estimated; and then the spatio-temporal variation characteristics are ana- lyzed. Finally, the results indicate that ： （ 1 ） The linear regression equation of PAR is obtained; the scale factor of PAR to solar radiation is 0.45 in Guizhou province. （2） There are clearly regional variation characteristics on PAR in Guizhou province. It decreases from west towards east, south and north, similar to the topography variation characteristics. The values are in the range of 1 446 MJ/m2 and 2 173 MJ/m2. （3） The frequency distribution takes on unimodality. The peak value of the PAR is 1 566.16 MJ/m2 ; the mean annual PAR is about 1 627.7 MJ/m2, and the gross PAR is 2.86 ×10^4 MJ for the whole province in 2001. （4） There are obvious seasonal variations on PAR all over the Guizhou province. In each season, the maximum value is all present in the western districts where the alti- tude is highest. The PAR value is up to the maximum in summer and down to the minimum in winter with unobvious regional differences. The seasonal variation of PAR is more consistent with the temperature variation in whole province; the mean PAR in July is the largest with 237.07 MJ/m2 and in January is the smallest with 78.52 MJ/m2.