关键词: 亚热带, 山区, 坡向, 坡度, 净辐射

Abstract: Each of the components of the radiation budget on sloping fields in the eastern subtropi-cal mountainous regions is calculated and analysed for the first time, dealing emphaticallywith the geographical distributions and variation rules of net radiation (NR). It is foundthat the value of annual average net radiation is greater in both south and north than in themiddle of the area, and the smallest value appears in the west of both Hunan and Hubei pro-vinces. The distribution of NR in summer is quite different from that mentioned above be-cause of the effect of the subtropical high. The variation of the NR with orientation is thegreatest in winter and smallest in summer. The variation pattern of NR with slope is appro-ximately the same on both north and south sides in summer, but it is extremely different inwinter. Annual range of NR is the greatest on north side and smallest on south side. Asfor cast and west sides, the annual range is between north and south. In addition, it is revea-led from the results of the calculation in this paper that the NR on north side may fall intominus value, and this is a new significant fact.

Key words: Subtropical zone (area), Mountainous area, Slope, Orientation, Net ra-diation