全球植物凋落物纤维素分解速率的变化特征及其影响因子

doi:10.17521/cjpe.2024.0144

植物生态学报 ›› 2025, Vol. 49 ›› Issue (3): 393-403.DOI: 10.17521/cjpe.2024.0144

全球植物凋落物纤维素分解速率的变化特征及其影响因子

周思琪¹, 艾灵¹, 倪祥银¹^,²^,³, 吴福忠¹^,²^,³, 吴秋霞¹, 朱晶晶¹, 张欣影¹^,²^,³^,^*()

¹福建师范大学地理科学学院, 福州 350117
²福建师范大学湿润亚热带生态-地理过程教育部重点实验室, 福州 350117
³福建三明森林生态系统国家野外科学观测研究站, 福建三明 365002

收稿日期:2024-05-08 接受日期:2024-12-10 出版日期:2025-03-20 发布日期:2025-01-02
通讯作者: * 张欣影(xyzhang@fjnu.edu.cn)
基金资助:
国家重点研发计划(2023YFF1305500);国家自然科学基金(32022056);国家自然科学基金(32101509);国家自然科学基金(32171641)

Global patterns and controls of variation in cellulose decomposition rates of plant litters

ZHOU Si-Qi¹, AI Ling¹, NI Xiang-Yin¹^,²^,³, WU Fu-Zhong¹^,²^,³, WU Qiu-Xia¹, ZHU Jing-Jing¹, ZHANG Xin-Ying¹^,²^,³^,^*()

¹School of Geographical Sciences, Fujian Normal University, Fuzhou 350117, China
²Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, Fujian Normal University, Fuzhou 350117, China
³Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, Fujian 365002, China

Received:2024-05-08 Accepted:2024-12-10 Online:2025-03-20 Published:2025-01-02
Contact: * ZHANG Xin-Ying(xyzhang@fjnu.edu.cn)
Supported by:
National Key R&D Program of China(2023YFF1305500);National Natural Science Foundation of China(32022056);National Natural Science Foundation of China(32101509);National Natural Science Foundation of China(32171641)

摘要/Abstract

摘要： 纤维素作为凋落物的关键组分之一, 其分解过程在陆地生态系统碳循环中具有重要作用。该研究汇集了现有研究关于凋落物纤维素分解的时间序列数据, 根据一级指数动力学方程估算了凋落物纤维素分解常数(k), 探索了k在不同气候带、生态系统和叶形态的分布格局, 以及气候、地形、土壤性质、凋落物底物质量对k的影响。结果表明: (1) k在不同气候带与叶形态上差异显著, 表现为: 热带(0.086) >亚热带(0.069) >温带(0.048), 阔叶树种(0.069) >针叶树种(0.059); (2)考虑了随机效应后, k随凋落物初始碳氮比、木质素纤维素比增加而下降, 而随年平均气温升高而增加。该结果表明, 凋落物底物质量和气候对纤维素分解具有重要影响。该研究深化了对凋落物纤维素分解规律的认识, 有助于优化植物凋落物周转和生态系统碳循环模型。

关键词: 纤维素, 凋落物分解, 气候, 凋落物底物质量

Abstract:

Aims As one of the key components of litter, cellulose decomposition plays an important role in the carbon cycle of terrestrial ecosystems. The objective of this study was to investigate the global patterns of cellulose decomposition rates of plant litters and the associated influential factors.
Methods We compiled a dataset from existing studies that reported the litter cellulose decomposition constant (i.e., k value, a measure of the decomposition rate). Using the first-order exponential kinetic model, we calculated the k values for litter cellulose decomposition. Then, we explored the distribution patterns of k across climatic zones, ecosystem types and leaf morphological types, and determined the extent to which these patterns were influenced by climate, terrain, soil properties, and litter substrate quality.
Important findings The decomposition rates of litter cellulose shifted pronouncedly with climatic zones and leaf morphological types, with climatic zone being highest in tropical (0.086), intermediate in subtropical (0.069) and lowest in temperate (0.048) regions, and with leaf morphology being higher in broadleaf than coniferous litters. Cellulose decomposition rates decreased with increase in initial carbon nitrogen ratio and lignin cellulose ratio, while increased with increasing mean annual temperature. These results suggest that litter substrate quality and climate play significant role for influencing litter cellulose decomposition. This study enhances our understanding of the litter cellulose decomposition, and helps to optimize plant litter turnover and ecosystem carbon cycle models.

Key words: cellulose, litter decomposition, climate, litter substrate quality

周思琪, 艾灵, 倪祥银, 吴福忠, 吴秋霞, 朱晶晶, 张欣影. 全球植物凋落物纤维素分解速率的变化特征及其影响因子. 植物生态学报, 2025, 49(3): 393-403. DOI: 10.17521/cjpe.2024.0144

ZHOU Si-Qi, AI Ling, NI Xiang-Yin, WU Fu-Zhong, WU Qiu-Xia, ZHU Jing-Jing, ZHANG Xin-Ying. Global patterns and controls of variation in cellulose decomposition rates of plant litters. Chinese Journal of Plant Ecology, 2025, 49(3): 393-403. DOI: 10.17521/cjpe.2024.0144

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2024.0144

https://www.plant-ecology.com/CN/Y2025/V49/I3/393

图/表 5

图1 全球凋落物纤维素分解速率研究样点的地理分布。每个样点的样本量用符号大小表示, 每个样点的气候带类型用不同颜色表示。

Fig. 1 Global distribution of studied sites for litter cellulose decomposition. The circle size represents the sample size at each site, and different colors denote the differences across climate zones.

图2 不同气候带(A)、生态系统(B)和叶片形态(C)的凋落物纤维素分解常数(k)差异。菱形表示线性混合模型计算的估计值, 括号内数字表示样本量。

Fig. 2 Differences in litter cellulose decomposition constant (k) among each of the climatic zones (A) and ecosystems (B) and between leaf morphologies (C). The hollow diamonds represent the estimated values from the linear mixed model, and the numbers within parentheses represent sample sizes.

图3 凋落物分解常数(k)与气候、地形、土壤性质、凋落物底物质量的相关性。阴影表示95%置信区间。

Fig. 3 Correlations of litter cellulose decomposition constant (k) with climate factors, topographic factors, soil properties, and litter substrate quality. C, carbon; N, nitrogen. MAP, mean annual precipitation; MAT, mean annual air temperature. The shaded areas represent 95% confidence intervals.

表1 凋落物纤维素分解常数(k)线性混合模型中各影响因子的效应

Table 1 Effects of filtering factors on the litter cellulose decomposition constant (k) based on the linear mixed model

影响因子 Influencing factor	k
影响因子 Influencing factor	样本量 Sample size	估计值 Estimate value	p
年平均气温 Mean annual air temperature (℃)	144	0.212	0.040^*
年降水量 Mean annual precipitation (mm)	134	0.029	0.695
海拔 Altitude (m)	123	0.079	0.405
土壤黏粒含量 Soil clay content (%)	131	0.058	0.402
土壤pH Soil pH	135	-0.117	0.151
凋落物碳氮比 Litter C:N	111	-0.245	<0.001^***
凋落物纤维素含量 Litter cellulose content (mg·g^-1)	129	-0.110	0.139
凋落物木质素:纤维素 Litter lignin:cellulose	129	-0.187	0.002^**
凋落物纤维素:氮 Litter cellulose:N	117	0.046	0.581

图4 影响凋落物纤维素分解常数(k)变化各因子的相对重要性。模型选择分析只包括表1中显著影响纤维素分解速率的变量, 截断值设置为0.8 (黑色实线), 以探索最重要的影响因子。

Fig. 4 Relative importance of different influencing factors on variation in litter cellulose decomposition constant (k). The model analysis included only the variables that have significant effects on litter cellulose decomposition constant as shown in Table 1, and the weight threshold of 0.8 (black solid line) was set to identify the most essential influencing factors. C, carbon; MAT, mean annual air temperature; N, nitrogen.

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全球植物凋落物纤维素分解速率的变化特征及其影响因子

Global patterns and controls of variation in cellulose decomposition rates of plant litters

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