自然地理地带问题,由于各家所拟区划的原则、方法和主要指标的侧重点不同,所划分的地带和界限很不一致,暖温带和亚热带的界限争议尤多。本文从热量和水分在地理环境中的对比关系——辐射干燥指数,结合辐射差额,讨论安徽省自然地理地带问题。

This paper discusses about the problem of the physical geographical zone in Anhui province in the light of the balance of heat and water in geographical condition,i.e.the radiative aridity index and the radiation balance. According to the formula,the evaporative power E=(δ/(δ+r))(1/L)×0.8Q-(δ/(δ+r))(1/L)R_e+(r/(δ+r))E_a and coefficient K=E/r and R=Q(1-a)-R_e,the radiative can be calculated. Based on the chart showing the radiatative aridity index,the author divide temperature zone with K and natural zones with K,and regards the isopleth of R= 60kcal/cm².yr as the derision between the warm temperate zone and the subtropical zone,the isopleth,of K=1.1 as the division between the deciduous broadleaf forest (brown earth) zone and the northern subtropical deciuous and evergreen broadleaf mixed (forest yellow-brown earth) zone,the isoplth of 0.8 as divesion between the northern subtropical deciduous and evergreen broadleaf mixed forest (yellow brownearth) zone and the mid-subtropical evergreen broadleaf forest (red-yellow earth) zone.Therefore,Anhui province can be diveded into three natural geographical zones:(1)The warm temperate submoist region-deciduous broadleaf forest (brown earth) zone. (2)The northern subtropical moist region-deciduous and evergreen broadleaf mixed forest (yellow-brown earth) zone. (3)The mid-subtropical moist region-evergreen broadleaf forest (red-yellow earth) zone.