【摘要】 2007年3月对禄丰村林场具有代表性的6.8 hm2云南松天然次生林的组成及生长状况进行了调查,分析了其林分类型、主要乔木树种的径阶分布及其在群落中的重要值,进而对林分的质量及生态效能进行了评价。研究结果表明:该云南松天然次生林可分为云南松-麻栎、云南松-麻栎-华山松及云南松-麻栎-滇油杉3种林分类型,位于山体上部、山尖、山顶坪地,具相同的稳定性。林木株数集中分布于径阶6 cm处,以云南松为优势树种,其林木分布较为均匀,优势度明显,在3种林分中所占的株数比例分别达61.21%、69.88%、77.36%,其次为伴生树种麻栎所占比例较高。整个云南松天然次生林云南松林木的优势度达69.19,重要值为79.67,其后依次为麻栎、滇油杉和华山松。林分中乔木树种的平均密度为2 730株/hm2,平均胸径为8.78 cm;而云南松林木的平均胸径为8.69 cm,平均高为6.9 m,平均密度为1 907株/hm2,蓄积量为38.14 m3/hm2,均低于滇中地区20年生云南松林木的平均生长量指标。其霸王木株数所占比例为7.87%,而被压木及濒死木所占比例高达44.41%。其群落结构简单,物种较少,林分中云南松林木的密度较小、平均胸径不大、出材率很低,生态功能差,为低质低效林分,急需改造。更多还原

【Abstract】 Choosing the secondary natural Pinus yunnanensis forests of 6.8 hm2 in Lufengcun forest farm of Yiliang county as the target,the composition and growth of the forests were investigated in March 2007,with the study propose to analyze the stand type,the diameter class distribution of dominant tree species and their important value in community,and further to assess the quality and function of the study forests.The results showed that the secondary natural P.yunnanensis forests at Lufengcun forest farm could be categoried into three stand types,namely P.yunnanensis-Quercus acutissima,P.yunnanensis-Q.acutissima-P.armandii,P.yunnanensis-Q.acutissima-Keteleeria evelyniana,growed at upper parts of mountain,mountain ridge and flatland in the top of mountain respectively.Most trees were in the diameter class of 6 cm,P.yunnanensis was dominant species,the percentage in three stand types were 61.21 %,69.88 % and 77.36 % respectively,next came the percentage of associated species named Q.acutissima.In the studied secondary natural P.yunnanensis forests,the dominance degree and important value of P.yunnanensis were 69.19 and 79.67 respectively,next came Q.acutissima,K.evelyniana and P.armandii.The average density of tree and the average DBH were 2 730 trees/hm2 and 8.78 cm respectively.The average DBH,average height,density,and volume of P.yunnanensis were 8.69 cm,6.9 m,1 907 trees/hm2 and 38.14 m3/hm2,all lower than the growth indexes of 20 years old P.yunnanensis forests in central Yunnan areas.The percentage of wolf trees accounted for 7.87 %,the percentage of suppressed trees and dead trees was 43.99 %.It was concluded from this study that the secondary natural P.yunnanensis forests in Lufengcun forest farm had simple community structure and low species number,the density of P.yunnanensis was low,the average DBH and timber percentage were also low,and the ecological function was poor.These studied forests could be defined as low quality and low effect stand,and operations for stand improvement were necessary.更多还原