论文部分内容阅读
本文对广东西江林场杉木萌更纯林和杉木、湿地松混交林分的结构、生长、生物量、根系和土壤理化性质等作了调查研究。调查资料用对比的方法和数理统计的方法进行分析。得出如下结论:(1)由于林分结构差,林木分布疏密不均,致使林分生长不佳,单位面积蓄积量和生物量低;(2)湿地松同萌更杉木混交,对杉木萌条高径生长无显著影响,而湿地松的高径生长和平均木生物量均优于杉木萌条,说明立地条件较适应湿地松生长;(3)9年生杉木萌条和8年生湿地松的树高和直径连年生长量均已急剧下降,平均生长量亦开始平缓下降,且下降时间相近似;(4)杉木为浅根密集型根系,湿地松为深根疏散型根系,两者混交,存在若争夺水分、养分的矛盾;(5)杉木萌更纯林与杉、湿混交林分的土壤理化性质大都没有显著差异。
In this paper, the structure, growth, biomass, root system and soil physical and chemical properties of the pure pure Chinese fir and the mixed Chinese fir and Slash Pine forests in Xijiang Forest Farm of Guangdong Province were investigated. Survey data using comparative methods and mathematical statistics for analysis. The conclusions are as follows: (1) Due to the poor stand structure, uneven distribution of forest, resulting in poor growth, per unit area volume and low biomass; (2) However, the diameter growth and the average wood biomass of P. elliottii were better than that of Chinese fir sprout, indicating that the site conditions were more suitable for the growth of P. elliottii. (3) The 9-year-old Chinese fir sprout and 8-year-old Pinus elliottii (4) Cunninghamia lanceolata is a shallow root-intensive root system and Slash pine is a deep root-evacuation type root system, the two are mixed, and the average annual growth rate of the tree height and diameter has declined sharply. (5) There is no significant difference in the soil physical and chemical properties between pure and pure Cunninghamia lanceolata forest and the mixed forest of Cunninghamia lanceolata and Cunninghamia lanceolata.