亚热带典型人工林凋落物地表和空中分解过程中溶解性有机质数量和光谱特征

doi:10.13292/j.1000-4890.202106.004

生态学杂志 ›› 2021, Vol. 40 ›› Issue (6): 1599-1608.doi: 10.13292/j.1000-4890.202106.004

亚热带典型人工林凋落物地表和空中分解过程中溶解性有机质数量和光谱特征

丁翊东,徐江琪,郑娇,吴盼盼,毛瑢^*

（江西农业大学林学院，国家林业和草原局鄱阳湖流域森林生态系统保护与修复实验室，南昌 330045）

出版日期:2021-06-10 发布日期:2021-12-10

Quantity and optical characteristics of dissolved organic matter derived from decomposing leaf litter on the ground and in the air in typical subtropical plantations.

DING Yi-dong, XU Jiang-qi, ZHENG Jiao, WU Pan-pan, MAO Rong^*

(Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed, College of Forestry, Jiangxi Agricultural University, Nanchang 330045, China).

Online:2021-06-10 Published:2021-12-10

摘要/Abstract

摘要： 以江西亚热带地区主要造林树种枫香（Liquidambar formosana）、木荷（Schima superba）、马尾松（Pinus massoniana）和湿地松（Pinus elliottii）作为研究对象，分别选取空中和地表分解150和360 d的叶片凋落物，通过模拟淋溶试验探究分解位置对凋落物来源的溶解性有机质（DOM）数量、C∶N∶P化学计量比和紫外可见吸收光谱特征的影响。结果表明：（1）分解150 d后，除木荷外，地表分解的枫香、马尾松和湿地松凋落物溶解性有机碳（DOC）产量显著高于空中分解的凋落物，但分解360 d后，分解位置对凋落物源DOC产量的影响因树种而异；（2）所有树种空中分解150 d的凋落物浸提液中C∶N、C∶P和N∶P比均高于地表分解的凋落物，但在分解360 d后，分解位置对C∶N∶P化学计量比的影响随着凋落物类型的变化而变化；（3）分解150 d后，与地表分解的凋落物相比，空中分解的凋落物淋溶液中的SUVA₂₅₄、SUVA₂₈₀和SUVA₃₅₀值较低，而S_275-295和S_350-400值较高，即DOM芳香化程度和分子质量较低；分解360 d后，阔叶树种（枫香和木荷）维持这种空间变化趋势，而针叶树种（马尾松和湿地松）则呈现相反的格局。综上，分解位置是影响亚热带人工林植物凋落物来源DOM数量和质量的重要因素，但其调控格局受凋落物类型和分解阶段的影响。

关键词: 芳香化程度, 分解位置, 分解阶段, 化学计量特征, 淋溶

Abstract: In this study, we collected leaf litter from four main afforestation species (i.e., Liquidambar formosana, Schima superba, Pinus massoniana, and Pinus elliottii) in subtropical regions of Jiangxi Province. Litter was decomposed for 150 and 360 days in the air and on the ground. Then, we assessed the effects of decomposition position on the amount, C∶N∶P stoichiometry and ultraviolet-visible absorbance optical properties of litterderived dissolved organic matter (DOM) in subtropical plantations. After 150 days decomposition, L. formosana,P. massoniana, and P. elliottiilitter decomposed on the ground produced higher dissolved organic carbon (DOC) amounts than those in the air, whereas the pattern of S. superba litter was opposite. After 360 days of decomposition, the effect of decomposition position on litter-derived DOC production was species-specific. After 150 days of decomposition, C∶N, C∶P, and N∶P ratios were higher in the leachate of tree litter decomposed in the air than those on the ground. The effect of decomposition position on C∶N∶P stoichiometry was dependent on litter type after 360 days of decomposition. Litter of broad-leaved tree species (L. formosana and S. superba) decomposed in the air often had lower SUVA₂₅₄, SUVA₂₈₀, and SUVA₃₅₀ values (i.e., lower aromaticity of DOM), but higher S_275-295 and S_350-400 values (i.e., lower molecular weight) in the leachates than that on the ground after 150 and 360 days of decomposition. For coniferous trees (P. massoniana and P. elliotti), litter-derived DOM aromaticity and molecular weight were lower in the air than on the ground after 150 days of decomposition, but greater after 360 days of decomposition. These results suggest that decomposition position is an important factor determining the quantity and quality of litter-derived DOM in subtropical plantations, and such effect is regulated by tree species and the stage of decomposition.

Key words: aromatic degree, decomposition position, decomposition stage, stoichiometric characteristics, leaching.

丁翊东, 徐江琪, 郑娇, 吴盼盼, 毛瑢. 亚热带典型人工林凋落物地表和空中分解过程中溶解性有机质数量和光谱特征[J]. 生态学杂志, 2021, 40(6): 1599-1608.

DING Yi-dong, XU Jiang-qi, ZHENG Jiao, WU Pan-pan, MAO Rong. Quantity and optical characteristics of dissolved organic matter derived from decomposing leaf litter on the ground and in the air in typical subtropical plantations.[J]. Chinese Journal of Ecology, 2021, 40(6): 1599-1608.

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亚热带典型人工林凋落物地表和空中分解过程中溶解性有机质数量和光谱特征

Quantity and optical characteristics of dissolved organic matter derived from decomposing leaf litter on the ground and in the air in typical subtropical plantations.

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