林下植被对杉木林地力影响的研究*

本文研究了林下植被对杉木林地力的影响,结果表明在正常的经营水平下,林下植被生长迅速。0.7的林分郁闭度,4～5年后生物量积累达4～5 t/ha;营养元素达80～100kg/ha。丰富的林下植被能促进养分的有效化,并且在一定程度上能起到改善土壤肥力的作用,因此对防止杉木林地力衰退具有一定的意义。

The Effects of Undergrowth on Productivity of Chinese Fir Plantation

A possibility study was conducted for controlling the degradation of productivity of Chinese Fir plantations by the help of its undergrowth. The results were as follows:1. The undergrowth develops quickly in Chinese Fir stands of closure 0.7. Its biomass and nutrient can accumulate 4~5 t/ha and 80~100 kg/ha respectively in 4~5 years and approximately 10~15 t/ha of organic matter can be obtained during a rotation by slash cutting tending.2. The content of nutrient in undergrowth is higher than that in trees. The undergrowth contributes more to nutrient cycling in the near-mature and mature stands.3. The undergrowth is favorable for the increase of the soil organic matter and soil nutrient content, especially available nutrient content.The results showed that it is possible to control the degradation of Chinese Fir plantations by the help of undergrowth and ecological management and self-fertilization of forest.