摘要
通过 建立径 流场,进行 不 同抚 育方 式 对 杉木 人 工 林水 土 流失 、土 壤 肥力 及 林 木生 长5 a 的定位 研究,结 果表明: 传统杉木 抚育方式 导致了 杉木幼林 地严 重水 土流 失,不 同抚 育方 式林地 水土流失 表现为 :扩穴连带 抚育> 块状抚 育> 不抚 育;随 抚育 破土 面 增大 ,林 地表 层土 壤砂质 化愈明 显,林地养 分含量 下降,抚育 对林地 的干扰主 要集中 在0 ~20 c m 土 层;不同抚 育方式杉 木生长效 应表现 为:扩穴连 带抚育 > 块状 抚育, 随时 间推 移,抚 育对 杉 木生 长 的影 响逐 年缩小 ,抚育方 式是影响 杉木人 工林长期 生产力 维持的重 要人为因 子。
Effects of tending on long term productivity of Chinese fir plantation were studied through runoff plots for 5 years. The results are as follows: Traditional tending of Chinese fir plantation leads to severe losses of soil and water. The loss amounts caused by different tending methods are in the sequence of strip tending>spot tending>non tending. The upper soil layer becomes arenaceous and its nutrient concentration decreases with increase of interference degree by tending. The soil in the layer of 0~20cm is strongly interfered. The growth responses of Chinese fir trees to different tending methods are in the sequence of strip tending >spot tending. The effect of tending on growth of Chinese fir decreases as time goes by. Therefore, traditional tending methods of Chinese fir plantation are important measures of their long term productivity.
基金
福建省教委科学基金