中国生态系统生产力区划

生态系统生产力区划是对生态系统生物生产能力在不同地域的差异性和相似性进行分区，本项研究根据序列划分、相对一致性、主导生态系统、区域生态系统共轭性、县级行政单元完整性等原则，把全国划分为12个1级区（生态系统生产力区域）、64个2级区（生态系统生产力地区），区划结果反映出中国生态系统生产力等级分布存在有明显的等级阶梯分布，而且这种阶梯分布与中国地貌轮廓的3级台阶有良好的关联，总的来说，全国大部分生态地区生态系统生产力水平可以农田生态系统的发展水平作为参照，而有些生态地区由于其利用结构的特殊性、对各类生态系统投入的不平衡导致了农田生态系统生产力与综合的生态系统生产力水平的变异。

Ecosystem Productivity Regionalization of China

The regionalization of ecosystem productivity in China is the process and result of dividing China into different regions according to the difference and likelihood of biota productivity. The ecosystem productivity region considers the modern topographic delineation and its macro control on the formation of ecosystem landscape characteristics and the influences of monsoon climate and the differentiation of ecosystems caused by light, temperature, water, and other conditions. The productivity zone firstly considers different ecosystem types and their combination characteristics, and then considers difference of ecosystem productivity for different types (e.g., farmland, forest and grassland). According to the value of comprehensive ecosystem productivity for each productivity zone in China, the comprehensive ecosystem productivity of China is divided into 5 grades. Finally, the regionalization divides the whole country into 12 first level ecosystem productivity regions, and 64 second level ecosystem productivity zones.It can be seen clearly from the regionalization that the grade distribution of ecosystem productivity of China is stepwise, which correlates well with the three steps of China's topographic profiles. The regionalization also indicates that the level of farmland ecosystem productivity can well evaluate the level of ecosystem productivity for most parts of China (i.e., 46 zones). However, for the rest of China (i.e., 18 zones), there exists sharp difference between the level of farmland ecosystem productivity and ecosystem productivity because of the imbalance of regional development.