马占相思人工林近自然改造群落结构转型2年期效果初报

Preliminary Report on the Effect of Close-to-Nature Transformation of Acacia Mangium Plantation in Jianfengling,Hainan for Two Years

近自然改造对马占相思人工林群落向热带天然林群落结构演替具有重要促进作用。该试验对采取了近自然改造措施的马占相思人工林林分的群落结构动态进行分析研究,结果表明:⑴通过适当的人工干预措施能促进满足一定条件的马占相思人工林在2年的时间内转型为符合热带天然林标准的林分。其中,林分改造前林下天然更新乡土树种幼苗幼树密度是成功转型的关键因素,对马占相思林而言,该研究初步获得的该指标阈值为3400株/hm^(2);⑵林分在转型过程中仍然保持自然正向演替,采伐等人工干预措施对林下天然更新乡土林木冠幅造成的损伤对林分的演替方向没有决定性的影响。

Close to nature transformation plays an important role in promoting the succession of Acacia mangium plantation community to tropical natural forest community structure.This experiment analyzed and studied the dynamics of community structure of Acacia mangium plantation which had taken near natural transformation measures.The results showed that:⑴Proper manual intervention measures could promote the transformation of Acacia mangium plantation that met certain conditions into a tropical natural forest within 2 years.Among them,the density of seedlings and young trees of native tree species naturally renewed under the forest before forest transformation is the key factor for successful transformation.For Acacia mangium forest,the threshold value of this index preliminarily obtained in this study is 3400 plants per hectare;⑵In the process of transformation,the forest still maintains a natural positive succession,and the damage caused by artificial intervention measures such as logging to the natural regeneration of local forest crown under the forest has no decisive impact on the succession direction of the forest.