Warming effects on the decomposition of two litter species in model subtropical forests
Warming effects on the decomposition of two litter species in model subtropical forests
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DOI：
10.1007/s11104-017-3392-9
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发表时间：
2017-08
期刊：
影响因子：
4.9
通讯作者：
Juxiu Liu;Shuange Liu;Yiyong Li;Shi-zhong Liu;Guangcai Yin;Juan Huang;Yue Xu;Guoyi Zhou
中科院分区：
文献类型：
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作者：
Juxiu Liu;Shuange Liu;Yiyong Li;Shi-zhong Liu;Guangcai Yin;Juan Huang;Yue Xu;Guoyi Zhou
目的保暖有可能改变植物在分解过程中的凋落物质量损失和养分释放。然而，关于凋落物种类或底物质量等其他因素如何改变温度升高对分解的影响，仍然存在很大的不确定性。同时，热带和亚热带森林生态系统中植物凋落物腐烂的温度敏感性一直没有得到很好的解决。方法通过将模型森林生态系统从高海拔地点转移到亚热带中国地区的低海拔地点，评估了实验变暖对两个不同树种(木荷和短花楠)凋落物分解和养分释放的影响。在试验期间，将模型山地常绿阔叶林(MEBF)迁移到海拔300米和30米处，使5厘米深的月平均地温分别提高了0.88℃和1.84℃。将模型针阔混交林(CBMF)移栽到海拔30 m处，使5 cm土层的月平均地温提高0.85℃。结果实验增温促进了两种模型林的凋落物分解，且随温度升高促进作用增强。高品质凋落物(木荷)比低品质凋落物(短花楠)对气候变暖有更强的响应。升温促进了木荷Na、K、Mg、P、N和Ca的释放，但仅促进了短花楠的模拟Ca释放。总体而言，在亚热带地区，凋落物分解受土壤温度、凋落物质量、土壤水分、凋落物孵化林型的控制。结论在亚热带中国地区，凋落物分解受到实验增温的促进。凋落物种类可以改变温度升高对凋落物分解的影响，而森林类型对凋落物分解没有影响。
AimsWarming has the potential to alter plant litter mass loss and nutrient release during decomposition. However, a great deal of uncertainty remains concerning how other factors such as litter species or substrate quality might modify the effects of increased temperature on decomposition. Meanwhile, the temperature sensitivity of plant litter decay in tropical and subtropical forest ecosystems remains poorly resolved.MethodsThis study was designed to assess the effects of experimental warming on litter decomposition and nutrient release of two contrasting tree species (Schima superbaandMachilus breviflora) by translocating model forest ecosystems from the high-elevation sites to the lower-elevation sites in subtropical China. Translocating model mountain evergreen broad-leaved forest (MEBF) to the altitude of 300 m and 30 m increased the average monthly soil temperature at 5 cm depth by 0.88 and 1.84 °C, respectively during the experimental period. Translocating model coniferous and broad-leaved mixed forest (CBMF) to the altitude of 30 m increased the average monthly soil temperature at 5 cm depth by 0.85 °C.ResultsWe found that experimental warming accelerated litter decomposition in both model forest types, and the promoting efficiency was greater when the temperature increased. The litter with high quality (Schima superba) had stronger response to warming than low quality litter (Machilus breviflora). Warming accelerated Na, K, Mg, P, N and Ca release fromSchima superbalitter, but only simulated Ca release fromMachilus brevifloralitter. Overall, litter decomposition was controlled by the order: soil temperature > litter quality > soil moisture > litter incubation forest type under experimental warming in the subtropical China.ConclusionWe conclude that leaf litter decomposition was facilitated by experimental warming in subtropical China. Litter species might modify the effects of increased temperature on litter decomposition; however, forest type has no effect on litter decomposition.