摘要
为提高红椎人工林育林成效,以3.5年生5种不同混交模式的红椎、黑木相思林分为研究对象,分析了不同混交模式下林分树高、胸径生长量及叶片光合产物(叶绿素、可溶性糖、淀粉)、养分含量的变化。结果表明:与纯林相比,混交能显著提升红椎、黑木相思林分的高径生长量,叶片叶绿素、可溶性糖与淀粉含量明显增加。混交显著增加了黑木相思叶片中氮、磷、钾含量,而红椎则以纯林中叶片氮、磷、钾含量最高,且具有随着黑木相思混交比例增大而红椎叶片养分含量呈下降趋势。但整体上,在供试5种试验林中,以7∶3红椎、黑木相思混交林中树高、胸径生长量最大,光合产物含量最高。混交能显著能提升红椎林分生长量,固碳能力增强,但考虑到树种间竞争性,其混交比例应控制在适宜范围内。
In order to improve the effectiveness of Castanopsis hystrix,and taking 3.5-year-old Castanopsis hystrix and Acacia melanoxylon with different mixed modes as the research subjects,this paper analyzed tree height of stand,growth amount of diameter at breast height,and photosynthetic products of leaves(chlorophyll,soluble sugar,starch)and the changes of nutrient content under different mixed modes.The results showed that compared with pure forest,mixed crossing could significantly improve the high diameter growth volume of Castanopsis hystrix and Acacia melanoxylon,and the content of leaf chlorophyll,soluble sugar and starch increased significantly.Mixed crossing significantly increased the content of nitrogen,phosphorus and potassium in leaves of Acacia melanoxylon,while Castanopsis hystrix had the highest content of nitrogen,phosphorus and potassium in the pure forest,and the nutrient content of Castanopsis hystrix leaves decreased with the increase of Acacia melanoxylon mixed crossing ratio.However,on the whole,in the five kinds of test forests,the largest tree height and growth amount of diameter at breast height and the highest output of photosynthetic product were found in the mixed forest with 7∶3 of Castanopsis hystrix and Acacia melanoxylon.The mixed crossing could significantly improve the growth amount and the carbon fixation ability of Castanopsis hystrix stand,but considering the competition among tree species,the mixed ratio should be controlled within the suitable range.
作者
陈家裕
Chen Jiayu(Zijin County Ecological Public Welfare Forest Management Center,Heyuan 517400,Guangdong)
出处
《防护林科技》
2022年第6期44-46,50,共4页
Protection Forest Science and Technology
基金
南平市自然科学基金项目(N2021J014)。
关键词
红椎
黑木相思
混交林
林分生长
生理特性
Castanopsis hystrix
Acacia melanoxylon
mixed forest
stand growth
physiological characteristics
作者简介
陈家裕(1992-),男,广东高州人,大学,工程师,主要从事森林培育研究.
