不同经营模式对马尾松人工林林下植被生物多样性的影响

Different Management Models:Effects on Bio-diversity of Undergrowth Vegetation of Pinus massoniana Plantations

为了对马尾松人工林在不同阶段不同的经营模式进行评价,本研究以湖南省祁阳县大江林场的马尾松人工林为研究对象,以林下草本植物的Margalef丰富度指数(R)、Simpson指数(D)、ShannonWiener指数(H′)与Pielou均匀度指数(E)为指标,研究无干扰模式、常规模式和近自然模式对马尾松人工林林下植被生物多样性的影响。结果表明:(1)在前期和中期,马尾松林下草本生物多样性指数(Margalef指数、Simpson指数、Shannon-Wiener指数和Pielou指数)的大小顺序为:无干扰模式>近自然模式>常规模式(P<0.05);(2)在后期,马尾松林下4个生物多样性的大小顺序为:近自然模式>常规模式>无干扰模式(P<0.05)。因此,在开展马尾松人工林的抚育经营活动时,应根据森林的发育阶段和经营目标,选择制定最适宜的经营方案。

To evaluate different forest management models of Pinus massoniana plantations at different stages,the authors took Pinus massoniana plantations of Dajiang Forest Farm in Qiyang,Hunan as a study object,studied the impacts of no disturbance management model,conventional management model and close-to-nature management model on bio-diversity of undergrowth vegetation of Pinus massoniana plantation,by using the indicators such as the Margalef richness index （R）,Simpson index （D）,Shannon-Wiener index （H＇） and Pielou evenness index （E） of undergrowth herb plantation.The results showed that：（1） at early and medium stage,the bio-diversity indexes of undergrowth herb of Pinus massoniana plantation （including R,D,H＇and E）followed an order as no disturbance management model〉close-to-nature management model〉conventional management model （P〈0.05）;（2） at later stage,the R,D,H＇and E followed an order as close-to-nature management model〉conventional management model〉no disturbance management model （P〈0.05）.All the results indicated that according to forest growth stages and aims,suitable plans should be made in Pinus massoniana plantation management.