Soil fauna affects the optical properties in alkaline solutions extracted (humic acid-like) from forest litters during different phenological periods
Soil fauna affects the optical properties in alkaline solutions extracted (humic acid-like) from forest litters during different phenological periods
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DOI：
10.1139/cjss-2018-0081
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发表时间：
2019-04
影响因子：
1.7
通讯作者：
Yu Tan;Wanqin Yang;X. Ni;B. Tan;Kai Yue;R. Cao;Shu Liao;Fuzhong Wu
中科院分区：
文献类型：
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作者：
Yu Tan;Wanqin Yang;X. Ni;B. Tan;Kai Yue;R. Cao;Shu Liao;Fuzhong Wu
通过腐殖化作用形成的土壤有机质对森林的长期固碳具有重要意义，但土壤动物是否影响腐殖化作用尚不清楚。在这项研究中，我们量化了土壤动物对光学特性的影响（即，采用不同筛孔大小的凋落物袋对两种亚热带万年青阔叶林4种凋落物的碱提类胡敏酸溶液进行处理，测定了其碱提类胡敏酸溶液的pH值（ΔlogK和E4/E6）。于2013年11月至2015年10月在落叶、萌芽、展开、成熟和衰老阶段收集凋落物袋，以评估土壤动物对凋落物腐殖化的影响是否在不同植物物候期存在差异。结果表明，土壤动物显著降低了栎树凋落物展叶期的ΔlogK和E4/E6值，显著降低了樟树和冷杉凋落物落叶期的ΔlogK和E4/E6值。土壤动物的丰富度指数解释了21%，55%，19%和45%的变化，在E4/E6值的橡树，冷杉，樟脑，松树凋落物，分别。凋落物含水量对这些光学性质的影响大于温度。这些结果表明，土壤动物在凋落物腐殖化过程中起着关键作用，在这些亚热带森林的土壤固碳的潜在参与。
The formation of soil organic matter via humification of plant litter is important for long-term carbon sequestration in forests; however, whether soil fauna affects litter humification is unclear. In this study, we quantified the effects of soil fauna on the optical properties (i.e., ΔlogK and E4/E6) of the alkaline-extracted humic acid-like solutions of four foliar litters by removing soil fauna via litterbags with different mesh sizes in two subtropical evergreen broad-leaved forests. Litterbags were collected at the leaf falling, budding, expanding, maturation, and senescence stages from November 2013 to October 2015 to assess whether the effects of soil fauna on litter humification vary in different plant phenology periods. The results showed that soil fauna significantly reduced the ΔlogK and E4/E6 values in the leaf expanding stage of oak litter and in the leaf falling stage of camphor and fir litters. The richness index of soil fauna explained 21%, 55%, 19%, and 45% of the variations in the E4/E6 values for oak, fir, camphor, and pine litters, respectively. The effects of litter water content on these optical properties were greater than that of temperature. These results indicated that soil fauna plays a key role in litter humification in the leaf expanding and falling stages and are potentially involved in soil carbon sequestration in these subtropical forests.