The results indicate that the functional combination of net radiation and radiative dryness index may not only determine NPP, but also elucidate basically the ordinal range of vegetation types.

• 结果表明，净辐射和辎射干燥指数的函数组合既是确定植被NPP的主导因子，又能在很大程度上说明植被地带性结构的有序排列。