抚育对北京低山侧柏游憩林灌草生物多样性的影响

Influence of tending on biodiversity of shrub and herbage in Platycladus orientalis recreational forest in Beijing lower mountainous area

该文研究低山厚土阳、阴坡侧柏游憩林抚育前和抚育1年后林下灌草生物多样性的变化情况。抚育措施包括清死枝、修活枝、割灌木等。结果表明:在阳坡侧柏游憩林内,抚育后灌木的Shannon指数、Shannon均匀度指数、Simpson指数、丰富度指数升高,提高幅度在0.6%～204.2%之间,且灌木优势种的优势地位减弱;而草本层的Shannon指数、Shannon均匀度指数、Simpson指数、丰富度指数都有所降低,降低幅度在9.0%～19.7%之间,且草本层中优势种的优势地位有所加强。在阴坡侧柏游憩林内,抚育后林下灌木的丰富度指数、Shannon指数和Simpson指数分别提高83.3%、32.4%和13.9%,且灌木优势种的优势地位减弱;而草本层的丰富度指数和Shannon指数增加18.7%和2.5%,且草本优势种的优势地位有所加强。研究认为,在北京低山侧柏游憩林内进行抚育是可行的。

The changes of several biodiversity indices of shrub and herbage in Platycladus orientalis recreational forest before and 1 year after tending were studied. The tending management included pruning dead branches and alive branches,cutting shrubs,etc. The results showed that after tending in P.orientalis recreational forest in sunny slope,the species richness index,Shannon-Wiener index,Shannon evenness index and Simpson index of shrub were increased by 0.6% to 204.2%,and the dominant status of dominant shrub species was weakened; while for herbage,these indices were reduced by 9.0% to 19.7%,and the dominant status of dominant herbage species was strengthened. In P. orientalis recreational forest in shady slope,the species richness index,Shannon-Wiener index and Simpson index of shrub were increased by 83.3%,32.4% and 13.9% respectively,and the dominant status of dominant shrub species was weakened; the species richness index and Shannon-Wiener index of herbage were increased by 18.7% and 2.5% respectively,and the dominant status of dominant herbage species was strengthened. Considering the ecological effects of tending,it is feasible to use tending in P. orientalis recreational forest in Beijing lower mountainous area.