湿地松和火炬松纯林和混交林生长比较

Comparative Study on Growth of Monoculture Versus Mixed-species Stands of Pinus elliottii and Pinus taeda

以湖北省荆门市彭山林场不同林龄的湿地松纯林、火炬松纯林和湿地松+火炬松混交林为研究对象,采用木材解析法,比较研究了湿地松、火炬松两个树种在纯林和混交林的生长特性,以了解两树种混交效果是否具有明显的增产效果。结果表明:与纯林相比,在15年时,湿地松和火炬松在混交林中直径分别增加了12.05%和10.60%,材积分别增加38.91%和24.25%。在所有5个混交林中,湿地松和火炬松的相对产量均大于1。湿地松和火炬松混交在生长量和材积上表现出正效应。在混交林中,湿地松获得更多的效应,但无论在纯林还是在混交林中,火炬松均比湿地松生长得好。

Pure Pinus elliottii stands, pure P.taeda stands, and mixed stands of P.elliottii and P.taeda of different forest ages in Pengshan forest farm of Jingmen city were chosen as research object, the growth characteristics of P.elliottii and P.taeda in pure stands and mixed stands were studied by wood analysis method, so as to find out whether mixed tree species had obvious effect on increasing yield.The results showed that positive mixing effects of growth and volume yield occurred in mixed stands of the two pine species.Compared to the corresponding pure stands, the total diameter increased 12.05% and 10.60% for P.elliottii and P.taeda in mixed stands at tree age of 15 years, respectively, and total volume of P.elliottii increased 38.91%, 24.25% for P.taeda.Although P.elliottii obtained more benefits in the mixed stands, but P.taeda showed better growth in pure and mixed stands than P.elliottii.Relative yield of P.elliottii in all the five mixed stands was greater than 1.0.Mixed stands of P.elliottii/P.taeda showed positive effects of growth and volume yield, and P.elliottii obtained more benefits in the mixed stands, but P.taeda showed better growth, no matter where it was in pure and mixed stands.