陕北黄土高原生态系统的生产功能

视生态系统的生物量产出为其重要的功能，应用系统组分—功能分析法，建立了生态系统生物量产出功能的基本估算模型；用此模型对陕北黄土高原以植被群丛组为主体划分的２２个基本生态单元的生物量产出进行了估算；在少匕基础上运用聚类分析法将其分为３个生态区，１３个生态亚区；依照生态系统的组分与功能特点，提出了各区生态系统向良性转化的对策与措施。

An Analysis on the Ecosystem Productive Function of the Loess Plateau in North Shaanxi Province

The primary net productivity has been regarded as the most important function of the ecosystem.After analysing the ecosystem structure and function of the Loess Plateau in North Shaanxiprovince,the primary net productivity of 22 ecological units has been calculated. Then the units havebeen incorporated into 3 ecological areas and 13 ecological subareas with the cluster analysis method.Finally,according to the character of the ecosystem productive function,measures have been providedto convert the ecosystem into beneficent cycle.