光合生产率也称净同化率,是植物在一定时期内(数日、数周、数月或整个生育期)通过光合作用所积累的干物质量,被这一时期的绿叶面积以及日数所除而得的数值。光合生产率通常以每平方米(M~2)叶面积于每昼夜(日)所增加的干物质克数来表示,常用的单位为干物质克/M~2·日。一般植物的光合生产率约为4～6克干物质/M~2·日,高的可达15～18克干物质/M~2·日。光合生产率与净光合强度这两个光合指标极其相似,但光合生产率的值总是比 The photosynthetic productivity, also known as the net assimilation rate, is the amount of dry matter accumulated by photosynthesis over a period of time (days, weeks, months, or entire growth periods) by the area of ​​green leaves and days The value of. Photosynthetic productivity is usually expressed in grams of dry matter per square meter (M ~ 2) of leaf area per day and night (day). Commonly used units are g / m 2 · day dry matter. The photosynthetic productivity of common plants is about 4 to 6 grams of dry matter / M ~ 2 days, up to 15 to 18 grams of dry matter / M ~ 2 days. Photosynthetic rate and net photosynthetic intensity of these two photosynthetic indicators are very similar, but the photosynthetic productivity value is always more than