The patterns of responses of litter decomposition of Cunninghamia needles and Cinnamomum leaves to substrate acidolysis
The patterns of responses of litter decomposition of Cunninghamia needles and Cinnamomum leaves to substrate acidolysis
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DOI：
10.5846/stxb201606301312
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发表时间：
2017
影响因子：
--
通讯作者：
唐黎 Tang Li;林永慧 Lin Yonghui;何兴兵 He Xingbing
中科院分区：
文献类型：
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作者：
唐黎 Tang Li;林永慧 Lin Yonghui;何兴兵 He Xingbing
为研究基质酸解对杉木（Cunninghamia lanceolata）针叶和香樟（Cinnamomum grassolora）叶片凋落物分解的影响，在湘西地区进行了田间试验。结果表明，凋落物的质量损失受基质酸解的刺激，并随酸解强度的增加而增加。此外，酸解对C。黄花蒿凋落物的强度大于黄花蒿。披针叶凋落物我们发现酸解可能会影响C.通过抑制微生物活动，包括真菌生物量和纤维素分解酶和木质素分解酶，来抑制杉木凋落物。然而，C.结果表明，不同的分解阶段和所测变量对酸解的影响程度不同。降解凋落物的总质量损失、木质素损失和纤维素损失对酸解的反应在两种物种之间不同，并且取决于分解阶段（即，凋落物分解的早期和晚期）。关于C.在腐解初期，随着酸解作用的加强，质量损失逐渐减小（T1> T2> T3），而在腐解后期，随着酸解作用的加强，质量损失逐渐增大（T3> T2/T1）。对于C.相反，在分解过程的每个阶段都是如此。因此，凋落物基质酸解不仅改变了凋落物分解过程中的有机化学成分和物理密实度，而且改变了微生物群落结构。这些综合效应，在不同的水平上，决定了凋落物分解和相关的微生物活动的反应，以底物酸解凋落物。
To test the effect of substrate acidolysis on litter decomposition of Cunninghamia lanceolata needles and Cinnamomum camphora leaves, we conducted a field experiment in western Hu′nan Province, China. In general, the results showed that mass loss of litter was stimulated by substrate acidolysis, and increased with the magnitude of acidolysis. Moreover, the effect of acidolysis on C. camphora litter was stronger than that on C. lanceolata litter. We found that acidolysis may affect the degradation of C. lanceolata litter through inhibition of microbial activities, including fungal biomass and cellulolytic and ligninolytic enzymes. However, for C. camphora litter, the responses of microbial activities to acidolysis during decomposition depended on the measured variables and decomposition stages. The responses of total mass loss, lignin loss, and cellulose loss of degrading litter to acidolysis differed between the two species, and depended upon decomposition stage (i.e., early and late stages of litter decomposition) . Regarding the litter of C. lanceolata, the mass loss declined with the strengthening of substrate acidolysis ( T1 > T2 > T3) at the early stage of decomposition, whereas it htt p:/ /w ww .ec olo gic a.c n http: / / www.ecologica.cn improved with increasing acidolysis (T3 > T2 / T1) at the late stage of decomposition. For the litter of C. camphora, the opposite was the case at each stage of the decomposition process. Thus, litter substrate acidolysis not only altered organic chemical components and physical compactness, but also altered the microbial community during the processes of litter decomposition. These combined effects, at different levels, determined the responses of litter decomposition and associated microbial activities to substrate acidolysis of litter.