在29a不同密度杉木林分内,对不同林下植物覆盖度和生物量梯度与土壤肥力的关系进行研究,研究结果表明:杉木林下植物的平均高、总覆盖度和生物量均随杉木林分密度的增加呈现明显的递减趋势;林下植物对土壤水分和孔隙状况有一定程度的改善作用,但0～20cm和20～40cm土层的有机质、全N、全P、水解N和速效P的含量基本上呈现出随林下植物覆盖度的增加而增加的趋势,并且以0～20cm尤为明显,这说明林下植物具有促进营养元素在地表富集的作用。因此,保护和恢复林下植物对杉木林地力的维护具有重要的意义。
The relations between gradients of undergrowth plant coverage and biomass and soil fertility have been studied in 29 year-old different density Chinese fir plantation.The results showed that the mean height, total coverage and biomass of undergrowth plant in 29 year-old Chinese fir plantation obviously decrease with the increase of forest stand density;soil moisture and pore properties are certainly improved by undergrowth plant,but the content of organic matter, total nitrogen, total phosphorous, available nitrogen and available phosphorous basically increase with the increase of coverage of undergrowth plant in 0～20 cm and 20～40 cm, and more obvious in 0～20 cm,It shows that undergrowth plant can promote to richen nutritional elements in topsoil. Therefore protection and restoration of undergrowth plant have important significance to conservation of soil fertility in Chinese fir plantation.
全 文 ：