12个亚热带树种凋落叶对模拟酸雨的缓冲性能及其控制因子  

The difference of acid buffering capacity of 12 subtropical leaf litters to simulated acid rain and its controlling factors.

作　　者：段萱 杨庆朋[2,3] 关欣 张伟东 陈波翰[2,4] 王娇[2,4] 赵峰侠 DUAN Xuan;YANG Qingpeng;GUAN Xin;ZHANG Weidong;CHEN Bohan;WANG Jiao;ZHAO Fengxia(College of Geographical Sciences,Shanxi Normal University,Taiyuan 030000,China;CAS Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Huitong National Research Station of Forest Ecosystem,Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest,Huitong 418307,Hunan,China;University of Chinese Academy of Sciences,Beijing 101408,China)

机构地区：[1]山西师范大学地理科学学院,太原030000 [2]中国科学院森林生态与管理重点实验室,中国科学院沈阳应用生态研究所,沈阳110016 [3]中国科学院会同森林生态实验站,亚热带森林生态系统结构与服务功能湖南省重点实验室,湖南会同418307 [4]中国科学院大学资源与环境学院,北京101408

出　　处：《生态学杂志》2023年第10期2441-2448,共8页Chinese Journal of Ecology

基　　金：“十四五”国家重点研发计划(2021YFD2201303);国家自然科学基金项目(41977092,U22A20612)资助。

摘　　要：探讨亚热带地区常见树种凋落叶的酸缓冲能力差异及其控制因子对森林恢复与管理具有重要意义和应用价值。本文以12种亚热带森林常见树种凋落叶为试材进行模拟酸雨浸提实验,通过测定凋落叶的物理化学初始性状以及浸提液的pH值和盐基离子含量,分析凋落叶初始性状与酸缓冲能力的关联性,确定凋落叶缓冲酸雨的主要调控因子。结果发现:凋落叶均显著提高了模拟酸雨溶液的pH值。大部分阔叶树种,如香椿、檫木以及油桐酸缓冲能力(>4)明显优于针叶树种的杉木和马尾松。山乌桕虽是阔叶树种,但其酸缓冲能力最弱(<1)。浸提时间也显著影响不同凋落叶的酸缓冲能力。除马尾松凋落叶在浸提1 d时缓冲能力最高外,其他物种均在浸提5 d时缓冲能力达到最高。酸缓冲能力与凋落叶初始pH值呈正相关(浸提1 d、5 d、15 d时相关系数分别为0.84,0.80,0.83;P<0.05),与木质素含量呈负相关(浸提1 d、5 d、15 d时相关系数分别为-0.68,-0.75,-0.69;P<0.05)。逐步回归分析也证实了凋落叶初始pH值是最主要的酸缓冲能力控制因子。研究表明,凋落叶的初始性状可以很好地预测不同物种的酸缓冲能力,建议未来从酸缓冲能力角度筛选物种时优先考虑pH值。It is important to explore the differences in acid buffering capacity of leaf litter and its controlling factors for forest restoration and management in subtropical region.It is unclear whether leaf litter traits can be used to predict acid buffering capacity.In this study,the leaf litters of 12 tree species in subtropical forests were selected for simulated acid rain extraction experiments.The pH value and base ions content of the extraction solution and the initial physicochemical traits of litters were examined.The main regulating factors of acid buffering capacity of litters were tested through the relationships between initial traits and acid buffering capacity.The results showed that leaf litters of all the species significantly increased pH value of simulated acid rain solution.The acid buffering capacity(>4)of most broadleaved species(e.g.,Toona sinensis(A.Juss.)Roem.,Sassafras tzumu(Hemsl.)Hemsl.and Vernicia fordii(Hemsl.)Airy Shaw),except for Sapium discolor(Champ.ex Benth.)Muell.Arg(<1),was significantly higher than that coniferous species(including Cunninghamia lanceolata(Lamb.)Hook.and Pinus massoniana Lamb.).The extraction time significantly affected the acid buffering capacity of litters.The strongest acid buffering capacity of Pinus massoniana litter occurred at 1 day of extraction,while that of the other species occurred at 5 days of extraction.Acid buffering capacity was positively correlated with initial pH value of litters(the correlation coefficients at 1 d,5 d and 15 d were 0.84,0.80 and 0.83,respectively;P<0.05),and negatively correlated with lignin content(the correlation coefficients at 1 d,5 d and 15 d were-0.68,-0.75 and-0.69,respectively;P<0.05).Stepwise regression analysis confirmed that initial pH value was the most important driving factor of acid buffering capacity.Our results indicated that initial leaf litter traits,especially pH value,can predict their acid buffering capacity.Therefore,pH value should be given priority when selecting species from the perspective of acid bufferi

关 键 词：酸雨 森林凋落物 凋落叶性状 酸缓冲能力 物种筛选 

分 类 号：S714[农业科学—林学]