南亚热带不同菌根类型树种叶凋落物化学性质  

Chemical properties of leaf litter among tree species with different mycorrhizaltypes in southern subtropical China

作　　者：巢林 李忠国[2] 莫珍珍 黄慧莲 王爱华 张建兵[1] 胡宝清 刘艳艳 CHAO Lin;LI Zhongguo;MO Zhenzhen;HUANG Huilian;WANG Aihua;ZHANG Jianbing;HU Baoqing;LIU Yanyan(Key Laboratory of Environment Change and Resources Utilization in Beibu Gulf,Ministry of Education,Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning,Guangxi 530001,China;Experimental Center of Tropical Forestry,Chinese Academy of Forestry,Guangxi Youyiguan Forest Ecosystem Research Station,Pingxiang,Guangxi 532600,China;School of Geography and Planning,Nanning Normal University,Nanning,Guangxi 530001,China;Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,Key Laboratory of Plant Resources Conservation and Sustainable Utilization,Guangzhou,Guangdong 510650,China;Huitong National Research Station of Forest Ecosystem,Huitong,Hunan 418307,China)

机构地区：[1]南宁师范大学北部湾环境演变与资源利用教育部重点实验室,广西地表过程与智能模拟自治区重点实验室,广西南宁530001 [2]中国林业科学研究院热带林业实验中心,广西友谊关森林生态系统国家定位观测研究站,广西凭祥532600 [3]南宁师范大学地理科学与规划学院,广西南宁530001 [4]中国科学院华南植物园,中国科学院退化生态系统植被恢复与管理重点实验室,广东广州510650 [5]湖南会同森林生态系统国家野外科学观测研究站,湖南会同418307

出　　处：《中国岩溶》2023年第3期472-481,共10页Carsologica Sinica

基　　金：国家自然科学基金青年项目(31800333);中央引导地方科技发展基金项目(桂科AD20238078,桂科AD19245133);中国博士后科学基金(2022M713194);广西自然科学基金项目(2018GXNSFBA138009,2021GXNSFBA196021);南宁师范大学科研启动项目(602021239257);北部湾环境演变与资源利用教育部重点实验室(南宁师范大学)开放或系统基金项目(NNNU-KLOP-X1917)。

摘　　要：文章以南亚热带24种木本植物(丛枝菌根、外生菌根和固氮树种各8种)叶凋落物为研究对象,探讨不同菌根类型树种叶凋落物化学性质的差异性。结果表明:叶凋落物在碳相关化学性质、养分含量以及化学计量比特征方面均表现出较大程度变异。不同菌根类型树种碳相关化学性质没有显著差异(P>0.05),而养分含量(N、P、Mg)和化学计量特征(C/P、N/P)差异显著(P<0.01)。固氮树种叶凋落物N含量(16.1 g·kg^(−1))显著高于丛枝菌根树种(10.1 g·kg^(−1))和外生菌根树种(10.7 g·kg^(−1)),但丛枝菌根树种叶凋落物P含量(0.4 g·kg^(−1))要显著高于固氮树种(0.1 g·kg^(−1))和外生菌根树种(0.08 g·kg^(−1)),而外生菌根树种Mg含量(0.51 g·kg^(−1))则显著高于丛枝菌根树种(0.19 g·kg^(−1))和固氮树种(0.03 g·kg^(−1));此外,固氮树种C/P和N/P均显著高于丛枝菌根树种。在南亚热带退化生态系统恢复过程中,应考虑不同菌根类型树种叶凋落物化学性质的差异,依据不同菌根类型树种养分利用策略的差异性选择适宜的恢复树种。The sample plot is located in the Experimental Center of Tropical Forestry,Chinese Academy of Forestry,the southwest of Guangxi,China.In a typical southern subtropical monsoon climate,the annual temperature of this area averages at 21℃with the lowest average at 12.5℃in January and the highest at 27℃in July.The average annual precipitation is between 1,200 to 1,500 mm,and shows obvious seasonality with the wet season from April to September and the dry season from October to March in the following year.The area is characterized by a typical landform with peak-cluster depression at the elevation ranging from 150 to 800 m.The main soil type in this area is red soil developed from carbonatite.Taking the leaf litter of 24 tree species with different mycorrhizal types(respective eight species for arbuscular mycorrhizal fungi,ectomycorrhizal fungi and nitrogen-fixers)as the research object,we measured the chemical properties of leaf litter(non-structure carbohydrate,water-soluble carbon,lignin,cellulose,hemicellulose and tannin)and nutrient concentration(N,P,K,Ca,Mg and Mn),analyzed the relationships of these properties,and explored the effects of different mycorrhizal types on the chemical properties.The results indicate that the chemical properties of leaf litter exhibited a fair degree of variation in carbon-related properties,nutrient contents and stoichiometric properties.There were no significant differences in carbon-related chemical properties among tree species with different mycorrhizal types(P>0.05).However,the nutrient content(N,P and Mg)and stoichiometry properties of leaf litter(C/P and N/P)were significantly different among mycorrhizal types.Nitrogen-fixer trees showed a significantly higher leaf litter N (16.1 g·kg^(−1)) than the trees with arbuscular mycorrhizal (10.1 g·kg^(−1)) and ectomycorrhizal fungi(10.7 g·kg^(−1)). However, tree species with arbuscular mycorrhizal fungi (0.4 g·kg^(−1)) exhibited a significantly higher Pconcentration than the trees with ectomycorrhizal fungi (0.1

关 键 词：凋落物 菌根 化学计量 碳循环 生态恢复 

分 类 号：S714[农业科学—林学]