黄河三角洲滨海湿地凋落物水溶性有机碳含量及质量

doi:10.13292/j.1000-4890.202207.029

摘要/Abstract

摘要： 立枯是凋落物分解的重要阶段，也是湿地生态系统碳循环的重要组成部分。水溶性有机碳（DOC）是凋落物分解产物之一，对湿地生态系统碳循环起着至关重要的作用。目前研究多侧重叶凋落物在地表分解过程中DOC含量及质量变化，对立枯分解过程叶及非叶器官（如茎、鞘等）DOC含量及质量的研究鲜见报道。本研究以黄河三角洲典型植被——芦苇（Phragmites australis）为例，以凋落物地表分解为参照，研究不同器官（叶、茎、鞘）立枯凋落物DOC含量及质量的变化。结果表明：（1）立枯凋落物DOC含量高于或等于地表同类型凋落物，最高相当于地表凋落物的1.64倍。立枯凋落物DOC的E₂/E₃值高于地表凋落物，C∶C值低于地表凋落物；（2）叶凋落物DOC含量高于非叶器官，分别是茎、鞘凋落物DOC含量的1.28～2.49、1.02～1.57倍。叶凋落物DOC的SUVA₂₅₄、C∶C值高于非叶器官，E₂/E₃值低于非叶器官。综上，从分解界面角度看，立枯凋落物DOC含量不低于地表，且其质量较高；从凋落物类型角度看，非叶器官凋落物DOC含量虽低于叶，但其质量高于叶。表明立枯及非叶器官DOC释放在芦苇凋落物分解过程中具有重要地位。因此，应注重立枯及非叶器官凋落物的分解研究，以期深入理解滨海湿地生态系统碳循环过程，对正确评价滨海湿地生态系统碳收支及其对全球气候变化的影响具有重要意义。

关键词: 立枯凋落物, 水溶性有机碳, 芦苇, 滨海湿地, 黄河三角洲

Abstract: Standing litter is an important stage of litter decomposition and a key component of carbon cycle in wetland ecosystems. Dissolved organic carbon (DOC) is the product of litter decomposition, playing a crucial role in ecosystem carbon cycling. Most previous studies have focused on the concentration and quality of DOC in leaf litter decomposed on soil surface. However, the DOC concentration and quality of leaf and non-leaf organs (e.g., sheath and culm) in standing litter are largely unknown. In this study, the concentration and quality of DOC in litter (i.e., leaf, culm, and sheath) of Phragmites australis were measured in the air and on the soil surface in the Yellow River Delta, China. The results showed that: (1) the concentration of DOC in standing litter was higher than or equal to that of litter on soil surface, with the highest DOC concentration of standing litter being 1.64 times of that on soil surface. The E₂/E₃ ratios of DOC in standing litter were higher than that of litter on soil surface, whereas the C∶C ratios of DOC in standing litter were lower than those on the soil surface. (2) The concentration of DOC in leaf litter was higher than that in nonleaf litter, which was 1.28-2.49 and 1.02-1.57 times of those in stem and sheath litter, respectively. Nevertheless, the SUVA₂₅₄ values and C∶C ratios of DOC in leaf litter were greater than those in non-leaf litter, whereas the E₂/E₃ ratios of DOC in leaf litter were lower than those in non-leaf litter. Taken together, standing litter of Phragmites australis had higher concentration and quality of DOC than litters on the soil surface. Furthermore, leaf litter had higher DOC concentration and lower DOC quality than non-leaf litter. Our results highlight that standing litter, especially non-leaf litter, plays a non-negligible role in litter decomposition. More attention should be paid to the decomposition of standing leaf and non-leaf litter in order to deeply understand carbon cycling of coastal wetlands, which is of great significance to accurately evaluate carbon budget of coastal wetlands and its impact on global climate change.

Key words: standing litter, dissolved organic carbon, Phragmites australis, coastal wetland, Yellow River Delta.

王晶东, 陶宝先, 陈庆海, 马澍, 张保华, 陈永金, 王浩, 袁海燕. 黄河三角洲滨海湿地凋落物水溶性有机碳含量及质量[J]. 生态学杂志, 2022, 41(7): 1276-1282.

WANG Jing-dong, TAO Bao-xian, CHEN Qing-hai, MA Shu, ZHANG Bao-hua, CHEN Yong-jin, WANG Hao, YUAN Hai-yan. The concentration and quality of dissolved organic carbon in the litter in the coastal wetlands of Yellow River Delta, China.[J]. Chinese Journal of Ecology, 2022, 41(7): 1276-1282.

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黄河三角洲滨海湿地凋落物水溶性有机碳含量及质量

The concentration and quality of dissolved organic carbon in the litter in the coastal wetlands of Yellow River Delta, China.

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