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Effect of Polyphenol of leaf litter on the leaf breakdown in a subtropical Stream

亚热带溪流中树叶凋落物多酚含量对树叶分解过程的影响


利用邻二氮菲-铁(Ⅲ)分光光度法测定了蒲桃与人面子树叶在二级溪流中分解时植物多酚含量的变化,并研究了多酚含量对树叶分解速率、底栖动物定殖以及微生物呼吸量的影响。结果表明,蒲桃叶片中初始多酚含量(19%)比人面子树叶的含量高(6%),其分解速率(分解系数k=0.01d-1)比人面子树叶慢(k=0.04d-1)。研究还发现,蒲桃叶片上的微生物呼吸量比人面子的低(每克叶片单位时间的耗氧量分别为0.2和0.4毫克),而且底栖动物中撕食者的种类和数量也比人面子树叶少。说明蒲桃叶片中较高的多酚含量抑制了微生物的活性和底栖动物的取食,从而减缓了蒲桃树叶的分解进程,表明叶片中多酚含量与树叶凋落物分解速率呈负相关关系。

We used a spectrophotometry method with 1, 10-phenanthroline-Fe (Ⅲ) to determine the contents of total polyphenol in two species of leaf litter, Dracontomelon duperreanum and Syzygium jambos. The effects of remaining polyphenolics concentration on decomposition rates, colonization of macroinvertibrates and microbial respiration in a subtropical stream were examined. Results showed that total polyphenol was significantly higher in S. jambos (19%) when compared to D. duperreanum (6%), and breakdown rate of S. jambos (k=0.01 day-1) was slower than that of D. duperreanum (k=0.04 day-1). The results also indicated that the average microbial respiration rates (0.2 mg O2 h-1 g DM-1) of S. jambos litters was significantly lower than those of D. duperreanum ( 0.4 mg O2 h-1 g DM-1), and its taxa richness and total density in shredders of macroinvertebrate was significantly less than in those of D. duperreanum (P<0.05). The low breakdown rate of S. jambos leaves in the early period is mainly as a result of inhibition of microbial activity as well as less palatable to shredders of macroinvertebrates due to high contents of polyphenols, which showed that the leaf polyphenol had a strong negative effect on leaf litter decomposition.


全 文 :第27卷第5期
2008年10月
生态科学
EcologicalScience
27(5):436
Oet.2008
EffectofPolyphenolofleaflitterontheleafbreakdown
inasubtropicalStream
GUANZhao.yin91,ZHAOYin92,TONGXiao.1i1·
1 CollegeofNatureResourcesandEnvironment,SouthChinaAgriculturalUniversity,Guangzhou510642,China
2CollegeofScience,SouthChinaAgriculturalUniversity,Guangzhou510642,China
Keywords:litterdecomposition,polyphenol,subtropicalstream
Abstract:Weusedaspectrophotometrymethodwithl。l0.phenanthroline.Fe(III)todet rminethecontentsofotal
polyphenolintwospeciesofleaflitter.Dracontomelonduperreanuma dSyzygiumjambos.Theeffectsofremaining
polyphenolicsc ncentrationondecompositionrates.colonizationofmacroinvertibratesandmicrobialrespirationina
subtropicalstreamwereexamined.ResultsshowedthattotalpolyphenolwasignificantlyhigherinSjambos(19%)
whencomparedtoD. uperreanum(6%),andbreakdownrateofS.jambos(豇:0.01day- )wasslowerthanthatofD.
duperreanum(后=0.04day叫) Theresultsal oindicatedthattheaveragemicrobialrespirationrates(0.2mg02h。g
DM以)ofS.jamboslitterswasignificantlylowerhanthoseofD.duperreanum(0.4mg02h。gDM。),anditstaxa
richnessandtotaldensitynshreddersofmacroinvertebrateWasignificantlylessthaninthoseofD.duperreanum
仔,microbialactivityaswellaslesspalatabletoshreddersofmacroinvertebratesduetohighcontentsofpolyphenols,
whichs owedthattheleafpolyphenolhadastrongnegativeeff ctonleaflitterdecomposition.
亚热带溪流中树叶凋落物多酚含量对树叶分解过程的影响
官昭瑛1,赵颖2,童晓立p
1华南农业大学资源环境学院广州510642;
2华南农业大学理学院广州510642
【摘要】利用邻二氮菲一铁(III)分光光度法测定了蒲桃与人面子树叶在二级溪流中分解时植物多酚含量的变化,并研究了多
酚含量对树叶分解速率、底栖动物定殖以及微生物呼吸量的影响。 结果表明,蒲桃叶片中初始多酚含量(19%)比人面子树叶
的含量高(6%),其分解速率(分解系数k=O.01d。1)比人面子树叶慢(k=O.04d。1)。研究还发现,蒲桃叶片上的微生物呼吸
量比人面子的低(每克叶片单位时间的耗氧量分别为0.2和0.4毫克),而且底栖动物中撕食者的种类和数量也比人面子树叶少。
说明蒲桃叶片中较高的多酚含量抑制了微生物的活性和底栖动物的取食,从而减缓了蒲桃树叶的分解进程,表明叶片中多酚含量
与树叶凋落物分解速率呈负相关关系。
关键词:多酚;树叶分解;亚热带溪流
中图分类号:Q948.1。S718.5 文献标识码:A 文章编号:1008.8873(2008)05-436一Ol
收稿日期:2008-09-10收稿,2008-10-10接受
基金项目:国家自然科学基金项目(30170121和30270279)
作者简介:官昭瑛(1982--),女,博士研究生,从事淡水生态学研究。
}通讯作者,E.mail:xton翰scau.edu.eel
万方数据
亚热带溪流中树叶凋落物多酚含量对树叶分解过程的影响
作者: 官昭瑛, 赵颖, 童晓立, GUAN Zhao-ying, ZHAO Ying, TONG Xiao-li
作者单位: 官昭瑛,童晓立,GUAN Zhao-ying,TONG Xiao-li(华南农业大学资源环境学院,广州,510642)
, 赵颖,ZHAO Ying(华南农业大学理学院,广州,510642)
刊名: 生态科学
英文刊名: ECOLOGICAL SCIENCE
年,卷(期): 2008,27(5)
被引用次数: 1次

引证文献(3条)
1.周晓庆.吴福忠.杨万勤.朱剑霄 高山森林凋落物分解过程中的微生物生物量动态[期刊论文]-生态学报 2011(14)
2.周晓庆.吴福忠.杨万勤.朱剑霄 高山森林凋落物分解过程中的微生物生物量动态[期刊论文]-生态学报 2011(14)
3.迟国梁.王军.王建武.童晓立 两种树叶在华南地区陆地与水环境中的分解速率比较[期刊论文]-生态科学
2009(4)


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