中国植物的可能生产力农业和林业的气候产量

THE POSSIBLE PRODUCTIVITY OF CHINESE PLANTS ——The Climatic Yield of Forest and Agricuture

植物的可能生产力是在一定的气候条件下,植物单位面积每年可能生产的有机干物质量。包括植物地上部分和地下部分生物量之和。在自然界,对于植物或植物群落的生产力起重要作用的因子是适宜的温度和充足的水分条件,但与地形和土壤肥力等因子也有关。由于各地气候条件不同,首先是热量和水分条件不同,形成植物产量也不同。因此。

The account by using Miami model states that most area of China have a very abundant quantity of heat. Water is the most important restrictive factor to the possible productivity force of Chinese plants.The possible productivity force of Chinese plants are gradually decrease from south-east seashore to north-west inland. The highest yield are up to 2100g/m2 year, and occured in Taiwan province.Base on the clematic yield, five producing regions are divided. Only a little bit defferent of evaporating index between these regions (from 450 to 500) . In China, in order to producing 1 ton crop, goo-1000 ton of water and 8.2× 106 kilocalorie solar energy are needed, and 1ton crop fixed 4.1× 106 kilocalorie of solar energy. Producing 1m3 wood, 400 ton of water and 3.9× 108 kilocalorie of solar energy are needed, and 1m3 wood fixed 2.35× 106 kilocalorie solar energy. The utilization ratio of solar energy are less than 1% in both case, But forest is a little bit higher than crops.