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本文研究了粤北石灰岩地区以任豆（Ｚｅｎｉａｉｎｓｉｇｎｉｓ）为主的自然林（萌生３４年）的生产能力，并与任豆人工林（６年生）作对照。结果表明，在１９９２年７月调查时，自然林和人工林的现存生物量分别是１２５．３８和１０．３４ｔ·ｈｍ－２；平均增长量为３．６９和１．７２ｔ·ｈｍ－２·ａ－１；木材蓄积量为８６．３５和９．９３ｍ３·ｈｍ－２；其乔木层总生产力为８４２８４和２１５１０ｋＪ·ｍ－２·ａ－１；对光合有效辐射能的利用效率为５．４３％和１．３９％。反映了任豆自然林现存生物系和生产力比鼎湖山南亚热带常绿阔叶林（同龄荫生林，在１９９１年１１月调查）现存生物量１９６ｔ·ｈｍ－２低，而比热带和亚热带半干旱区森林植物量分别１０７和９８．７ｔ·ｈｍ－２高。任豆人工林因盖度和叶面积指数比自然林低，故总生产力和光能利用率也比较低，说明任豆人工林尚有较高的生产潜力。
In this paper, the productivity of natural forests dominated by Zenia insignis in limestone area of northern Guangdong Province (34-year-old) was studied and compared with that of Ren bean plantation (6-year-old). The results showed that the existing biomass of natural forests and plantations were 125.38 and 10.34 t · hm-2 respectively at the July 1992 survey; the average growth was 3.69 and 1.72 t · hm-2 · a-1; the stock volume of wood was 86.35 and 9.93m3 · hm-2 respectively; the total productivity of arbor layer was 84284 and 21510kJ · m-2 · a-1; the utilization efficiency of photosynthetic active radiation was 5.43 % And 1.39%. It reflects that the existing biology system and productivity of Renwu natural forest are lower than the 196t · hm-2 existing biomass of Dinghu Mountain subtropical evergreen broad-leaved forest (same shade forest, surveyed in November 1991) The amount of forest plants in arid areas was 107 and 98.7 t · hm-2, respectively. Ren-bean plantation due to the coverage and leaf area index lower than the natural forest, so the total productivity and utilization of light energy is also relatively low, indicating Ren-bean plantations still have a higher production potential.