低效生态公益林中套种的长叶榧生长状况分析

Growth Status Analysis of Torreya grandis Interplanting in Low-Efficiency Forest

阐述了在福建清流低山地带公益林中套种长叶榧树的生长状况。试验选择弱度郁闭(0.20~0.39)、中度郁闭(0.40~0.69)和高度郁闭(≥0.7)3种处理和不套种(CK处理),采用标准地法调查测定长叶榧树造林成活率与保存率以及林木生长量;结果表明:长叶榧树在低山地带生长状况良好,但不同郁闭度公益林下套种的长叶榧树生长状况存在一定差异,以中度郁闭(0.40~0.69)林下长叶榧树生长最好。中度郁闭与弱度郁闭、高度郁闭处理比,造林成活率和造林保存率均较高,7 a生中度郁闭处理树高生长量显著高于弱度郁闭,中度郁闭处理胸径显著高于高度郁闭处理,中度郁闭处理单株立木材积显著高于弱度和高度郁闭处理,中度郁闭的处理单位面积立木材积显著高于弱度郁闭和高度郁闭处理。中度郁闭的长叶榧树生长状况较为稳定,具有较高的竞争能力。建议在低山地带推广应用长叶榧树造林,以保护和发展这一珍贵树种,同时提高低山地带生态公益林森林质量。

This paper reports the growth status of Torreya grandis interplanting in non-profit forest on low mountain zone of Qingliu County,Fujian Province.Three treatments of weak canopy(0.20~0.39),moderate canopy(0.40~0.69)and high canopy(≥0.7)as well as no interplanting(CK treatment)were selected.The survival rate and conservation rate of T.grandis plantation as well as tree growth increment were investigated by standard plot method.The results showed that T.grandis grew well in the low mountain zone,but there were some differences in the growth of T.grandis interplanted in the non-profit forest with different canopy density,and T.grandis grew best in the moderate canopy forest(0.40~0.69).The ratio of moderate canopy to weak canopy and high canopy treatment showed higher survival rate and preservation rate.The tree height increment in moderate canopy treatment was significantly higher than that in weak canopy;the diameter at breast height in moderate canopy treatment was significantly higher than that in high canopy treatment,and the volume per tree in moderate canopy treatment was significantly higher than that in low canopy and high canopy treatment.The stand volume per unit of moderate canopy treatment was significantly higher than that of weak canopy or high canopy treatment.T.grandis with moderate canopy had relatively stable growth and higher competitive ability.It is suggested that T.grandis should be popularized in the low mountain zone to protect and develop this precious tree species and improve the forest quality of the ecological non-profit forest in the low mountain zone.