摘要
基于数字高程模型数据,全面考虑地形因子对太阳短波辐射各辐射分量的影响,在分别建立太阳直接辐射和散射辐射模型的基础上,确定了山地太阳光合有效辐射的基本模型,并依据模型计算陕西省平均月、季、年光合有效辐射及≥0℃和≥10℃期间光合有效辐射分布情况,探讨局地地形对光合有效辐射的影响机理。结果表明,模型模拟结果与利用传统方法计算结果相一致,说明模型是可靠的;≥0℃和≥10℃期间光合有效辐射的空间分布情况说明陕西省光能资源丰富,理论上农业产量有较大的提升空间;局地地形对山区光合有效辐射影响显著,光合有效辐射量随坡度的升高而逐渐减少,偏南方向辐射量较大,偏北方向较小,东、西坡辐射量呈对称分布,同时地形对其的影响程度随季节而变,相对于夏季,在太阳高度角较低的冬半年,地形影响较大。
A photosynthetic active radiation （PAR） model of actual terrain was established based on the distributed models of direct and diffuse radiation over mountainous terrains, in which the digital elevation model data and all the factors relating to topographical factors were combined effectively. According to the model, the spatial distribution of PAR in average month, season and year under temperature ≥0℃ and ≥10℃ were evaluated in Shaanxi province. The effect of various local topographic factors on PAR was also discussed. The results showed that the PAR distributed model was reliable. Spatial distribution of PAR with temperature ≥0℃ and ≥10℃ indicated that there were abundant solar energy resources in Shaanxi province and the agricultural production would improve in theory. The Effect of topographic factors on PAR over mountainous terrain were obviously, the PAR amount reduced gradually with the slope increasing, larger in southern direction and smaller in northern direction, distributed symmetrical in east and west slope. Moreover the effect of local topographic factors on PAR changed with season going. The topographical effect was more obviously in winter than in summer, because of lower sun elevation angle.
出处
《中国农业气象》
CSCD
北大核心
2012年第3期355-361,共7页
Chinese Journal of Agrometeorology
基金
陕西省科技厅13115重大科技专项"基于GIS的陕西省精细化农业气候资源与区划"(2009ZDKG-08)
