南方红壤侵蚀区芒萁生长特征及其对环境因子的响应

采用样方法,调查了福建省长汀县红壤侵蚀区马尾松林下芒萁的生物量、覆盖度和高度生长特征,并与地形、土壤养分和土壤侵蚀强度等环境因子进行相关性分析.结果表明,不同坡向上的芒萁生物量差异较为明显,其中位于东坡的样地生物量最大(1 967.65 g/m2),位于南坡的生物量最小(1 230.28 g/m2).各样地的芒萁覆盖度和高度随着坡位的升高而逐渐降低.芒萁总生物量、覆盖度和高度与有机质和全氮呈显著的正相关性.土壤侵蚀程度与芒萁的生物量、覆盖度和高度都达到极显著的负相关性.该地区芒萁的生长主要受侵蚀程度、土壤有机质和全氮等因素的影响.芒萁对控制水土保持有着重要的作用,因而可作为南方红壤侵蚀区水土保持与生态修复的先锋植被.

Responses of Disranopteris Dichotoma Growth to Environmental Factors in Eroded Red-soil Region of Southern China

The biomass,coverage and height of Disranopteris dichotoma,as well as topography,soil nutrients and soil erosion degree in Changting County,Fujian Province,were investigated using quadrat methods.The differences of the biomass were evident in different slope directions.The total biomass for the quadrats on east slope was with the maximum of 1 967.65g/m² and for the quadrats on south slope,with the minimum of 1 230.28g/m².The coverage and height decreased with increased slope position.The total biomass,coverage and height were positively correlated with soil organic matter and total nitrogen.Soil erosion degree was significantly negatively correlated with the biomass,coverage and height.The Dicranopteris dichotoma growth was apparently influenced by soil erosion degree,soil organic matter and total nitrogen.Dicranopteris dichotoma plays some important roles in controlling soil and water loss and therefore,it can be used as pioneer vegetation in soil and water conservation and ecological restoration of the study area.