马占相思人工林不同林下灌木叶片功能性状的差异  

Variations of Leaf Functional Traits of Some Understory Species in Acacia mangium Plantation

作　　者：莫其锋 孔杰君 王艺颖 陈轶群 何至杭 刘效东 王文娟 彭钟通 钟佩桥 MO Qi-feng;KONG Jiejun;WANG Yi-ying;CHEN Yi-qun;HE Zhi-hang;LIU Xiao-dong;WANG Wen-juan;PENG Zhong-tong;ZHONG Pei-qiao(College of Forestry and Landscape Architecture,South China Agricultural University,Guangzhou 510642,Guangdong,China;Guangdong E5huangzhang Forest Ecological Research Station,Yangjiang 529631,Guangdong,China;College of Natural Resource and Environment,South China Agricultural University,Guangzhou 510642,Guangdong,China;Research Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing,100091,China;Life Sciences College of Zhaoqing University,Zhaoqing 526061,Guangdong,China)

机构地区：[1]华南农业大学林学与风景园林学院,广东广州510642 [2]广东鹅凰嶂森林生态系统定位观测研究站,广东阳江529631 [3]华南农业大学资源环境学院,广东广州510642 [4]中国林业科学研究院森林生态环境与保护研究所,北京100091 [5]肇庆学院生命科学学院,广东肇庆526061

出　　处：《林业科学研究》2021年第3期135-144,共10页Forest Research

基　　金：广东省基础与应用基础研究基金(2019A1515011508);国家自然科学基金(31700371);广东林业生态监测网络平台建设项目(2019KJCX021,2020-KYXM-09)资助。

摘　　要：[目的]探究马占相思(Acacia mangium Willd.)人工林不同林下灌木叶片功能性状的差异,为华南地区成熟人工林林下植被更新中物种选择提供科学参考。[方法]本研究以广东鹤山地区造林恢复34年的马占相思人工林林下4种灌木(九节(Psychotria rubra(Lour.)Poir.)、梅叶冬青(Ilex asprella(Hook.et Arn.)Champ.ex Benth var.as)、三叉苦(Evodia lepta(Spreng.)Merr.)和桃金娘(Rhodomyrtus tomentosa(Ait.)Hassk.))为研究对象,探讨4种灌木叶片功能性状的差异,试图阐明不同灌木对人工林林下环境适应的生理机制。[结果](1)4种灌木中,桃金娘的比叶质量最大,为157.51 g·m^(-2),显著高于其它3个物种,梅叶冬青的比叶质量最小;三叉苦叶片的氮和磷含量最高,但氮磷比却最低;(2)梅叶冬青叶片叶绿素a和b含量都显著高于其它物种,但其类胡萝卜素含量却显著低于九节,而高于三叉苦和桃金娘;(3)梅叶冬青叶片可溶性总糖和非结构性碳水化合物(NSC)显著高于其它3个物种,淀粉含量显著高于三叉苦和桃金娘,说明维持较高的可溶性糖和淀粉有利于梅叶冬青适应林下的荫蔽环境。[结论]综合以上的各项指标,在4种灌木中,梅叶冬青较低的比叶质量可以维持较强的光合能力,且其较高的叶片非结构性碳水化合物含量也能为其适应林下荫蔽环境提供稳定的能量供应。因此,梅叶冬青可以作为华南地区成熟人工林林下植被更新的选择物种。[Objective]To study the variation of leaf functional traits of different understory shrubs in Acacia mangium Willd.plantation,so as to provide references for species selection for regeneration of understory vegetation in mature plantation in southern China.[Method]In this paper,four understory shrubs,including Psychotria rubra(Lour.)Poir.,Ilex asprella(Hook.et Arn.)Champ.ex Benth var.as,Evodia lepta(Spreng.),and Rhodomyrtus tomentosa(Ait.)Hassk.in a thirty-four-year reforested A.mangium plantation in Heshan City,Guangdong Province,were used to study the variation of leaf functional traits and try to clarify the adapting mechanisms of understory species to light environment in plantation.[Result](1)The leaf mass per area(LMA)of R.tomentosa was the highest,with the value of 157.51 g·m^(-2),which was significantly higher than those of the other species,and the LMA of I.asprella was the smallest;the leaf N and P concentrations of E.lepta was the highest,but with the lowest N:P ratios;(2)Both the Chl a and Chl b contents in I.asprella leaves were significantly larger than those of the other species,and the leaf carotinoid content in I.asprella was lower than that of P.rubra,but higher than that of E.lepta and R.tomentosa;(3)The leaf soluble sugar and non-structural carbohydrates(NSC)of I.asprella was significantly higher than those of the other species,and the leaf starch concentration of I.asprella was also significantly larger than those of E.lepta and R.tomentosa,indicating that I.asprella can well adapt to the shade environment via storing relatively higher soluble sugar and starch.[Conclusion]Among the four understory plants,the lower LMA of I.asprella can be helpful to maintain the strong photosynthetic capacity.Also,the higher NSC in leaf of I.asprella can provide stable energy for adapting shade environment.Therefore,I.asprella can be a selective species for regeneration of understory in mature plantation in southern China.

关 键 词：林下层 光合色素 非结构性碳水化合物 人工林 华南地区 

分 类 号：S754.3[农业科学—森林经理学]