木质素酚类物质对内蒙古退化草地土壤有机碳的影响

doi:10.17521/cjpe.2024.0072

植物生态学报 ›› 2025, Vol. 49 ›› Issue (1): 30-41.DOI: 10.17521/cjpe.2024.0072 cstr: 32100.14.cjpe.2024.0072

木质素酚类物质对内蒙古退化草地土壤有机碳的影响

杜淑辉¹, 褚建民², 段俊光², 薛建国³, 徐磊⁴, 徐晓庆², 王其兵³, 黄建辉³, 张倩²^,^*()

¹山西农业大学林学院, 山西太谷 030800
²中国林业科学研究院林业研究所, 北京 100091
³中国科学院植物研究所植被与环境变化国家重点实验室, 国家植物园, 北京 100093
⁴乌鲁木齐种苗场, 乌鲁木齐 830013

收稿日期:2024-03-14 接受日期:2024-08-23 出版日期:2025-01-20 发布日期:2025-03-08
通讯作者: * (langli_zhang@126.com)
基金资助:
中国科学院战略性先导科技专项(A类)(XDA26020102)

Influence of lignin phenols on soil organic carbon in degraded grassland in Nei Mongol, China

DU Shu-Hui¹, CHU Jian-Min², DUAN Jun-Guang², XUE Jian-Guo³, XU Lei⁴, XU Xiao-Qing², WANG Qi-Bing³, HUANG Jian-Hui³, ZHANG Qian²^,^*()

¹College of Forestry, Shanxi Agricultural University, Taigu, Shanxi 030800, China
²Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
³State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, China National Botanical Garden, Beijing 100093, China
⁴Ürümqi Seedling Farm, Ürümqi 830013, China

Received:2024-03-14 Accepted:2024-08-23 Online:2025-01-20 Published:2025-03-08
Supported by:
Strategic Priority Research Program of the Chinese Academy of Sciences(XDA26020102)

摘要/Abstract

摘要：

退化草地土壤有机碳流失与积累的影响因素亟需深入研究。植物残体来源的木质素酚类物质是土壤有机碳的重要组成部分, 苯环开环导致的木质素酚类物质分解是否是退化草地土壤有机碳流失的重要过程, 尚未见研究报道。该研究针对内蒙古锡林郭勒典型草原4个退化阶段草地, 测定了土壤中木质素酚类物质含量、苯环开环关键功能基因(邻苯二酚-1,2-双加氧酶基因, catA)丰度和分解产物(顺,顺-已二烯二酸)丰度, 分析了其沿退化梯度的变化规律及其与土壤有机碳含量的关系。主要结果: 1)与未退化草地相比, 轻、中、重度退化草地土壤木质素酚类物质含量均显著降低, 且随退化程度加剧呈下降趋势, 木质素酚类物质含量与土壤有机碳含量呈显著正相关关系; 2) catA基因丰度在退化草地中显著升高, 顺,顺-已二烯二酸丰度在中、重度退化草地显著高于轻度和未退化草地; 3)相关性分析结果表明, catA基因丰度和顺,顺-已二烯二酸丰度显著正相关, 而木质素酚类物质含量与catA基因丰度显著负相关, catA基因丰度和顺,顺-已二烯二酸丰度均与土壤有机碳含量显著负相关。该研究发现, 在样地尺度上, 苯环开环导致的木质素酚类物质分解可以用于解释内蒙古退化草地土壤有机碳含量的变化, 土壤木质素酚类物质降解是土壤有机碳流失的重要原因。该研究有望为退化草原土壤有机碳流失、积累特征及驱动机制研究提供新的视角, 为退化草原恢复提供一定的理论依据。

关键词: 草原生态学, 退化草地, 木质素酚类, 苯环开环, 土壤有机碳, 退化因子解析

Abstract:

Aims The influencing factors on the loss and accumulation of soil organic carbon in degraded grasslands need to be clarified. The lignin phenols derived from plant are important composition of soil organic carbon, and the decomposition of lignin phenols caused by benzene ring opening is an important process of soil organic carbon loss in degraded grasslands, however, studies on this point are not fully understood.

Methods Soil samples were collected in four degradation severities of typical grasslands in Xilin Gol, Nei Mongol. The content of lignin phenolic and the abundance of the key functional gene for benzene ring opening, catechol-1,2-dioxygenase gene (catA), and product (cis,cis-muconic acid) were measured. And variations of lignin phenols and the abundance of catA gene along the degradation gradient and their correlation with soil organic carbon content were also analyzed.

Important findings The results showed that 1) compared to the non-degraded grasslands, the content of lignin phenols in the soil of light, medium, and severe degraded grasslands decreased significantly, and showed a decreasing trend with increasing degradation. The content of lignin phenols showed the same pattern with significantly positively correlation with soil organic carbon content. 2) The abundance of catA gene significantly increased in degraded grasslands, and the abundance of its decomposition product cis,cis-muconic acid was significantly higher in moderate and severe degradation compared to that in the light and non-degradation grasslands. 3) The abundance of catA gene was significantly positively correlated with the abundance of cis,cis-muconic acid, while the content of lignin phenols was significantly negatively correlated with the abundance of catA gene. The abundance of catA gene and cis,cis-muconic acid were both significantly negatively correlated with soil organic carbon content. The results showed that, at the sample site scale, the decomposition of lignin phenols caused by benzene ring opening could be a potential mechanism in explaining the changes in soil organic carbon content in degraded typical grasslands in Nei Mongol. Thus, our results are expected to provide a new perspective for the driving mechanism of soil organic carbon loss and accumulation in degraded grasslands, and thereby providing a certain theoretical basis for the restoration of degraded grasslands.

Key words: grassland ecology, degraded grassland, lignin phenols, benzene ring opening, soil organic carbon, degradation factor analysis

杜淑辉, 褚建民, 段俊光, 薛建国, 徐磊, 徐晓庆, 王其兵, 黄建辉, 张倩. 木质素酚类物质对内蒙古退化草地土壤有机碳的影响. 植物生态学报, 2025, 49(1): 30-41. DOI: 10.17521/cjpe.2024.0072

DU Shu-Hui, CHU Jian-Min, DUAN Jun-Guang, XUE Jian-Guo, XU Lei, XU Xiao-Qing, WANG Qi-Bing, HUANG Jian-Hui, ZHANG Qian. Influence of lignin phenols on soil organic carbon in degraded grassland in Nei Mongol, China. Chinese Journal of Plant Ecology, 2025, 49(1): 30-41. DOI: 10.17521/cjpe.2024.0072

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2024.0072

https://www.plant-ecology.com/CN/Y2025/V49/I1/30

图/表 9

表1 不同退化程度典型草原植物群落特征(平均值±标准差)

Table 1 Plant community characteristics of grasslands with different degradation severities (mean ± SD)

	物种丰富度 Species richness	地上生物量 Above ground biomass (g·m^-2)	盖度 Coverage (%)	密度(株·m^-2) Density (No.·m^-2)
未退化 Non-degradation	9 ± 1.4^ab	400.13 ± 20.86^a	81.7 ± 6.3^a	799 ± 292.9^a
轻度退化 Lightly degradation	5 ± 0.8^c	252.55 ± 26.37^b	51.7 ± 2.4^b	402 ± 176.5^ab
中度退化 Moderately degradation	6 ± 2.1^bc	156.16 ± 10.09^c	37.7 ± 2.0^c	309 ± 31.4^b
重度退化 Severely degradation	11 ± 1.4^a	65.72 ± 24.46^d	20.0 ± 4.1^d	193 ± 31.4^c

表2 不同退化程度草地土壤木质素酚类物质组成的二元置换多元方差分析

Table 2 PERMANOVA analysis on soil lignin phenols composition of grasslands with different degradation severities

	自由度 df	平方和 Sum of squares	复相关系数 r	F检验计算值 F value	p
退化程度 Degradation severity	3	1.03	0.71	24.39	0.001^***
土壤深度 Soil depth	1	0.10	0.07	7.25	0.007^***
交互效应 Interactive effect	3	0.09	0.06	2.26	0.050^*
残差 Residual	16	0.22	0.16
总计 Total	23	1.45	1.00

图1 不同退化程度草地不同土壤深度中木质素酚类物质含量(平均值±标准差)。不同小写字母表示相同土层不同退化程度之间有显著差异; 不同大写字母表示相同退化程度不同土层之间有显著差异(p < 0.05)。

Fig. 1 Content of lignin phenols in different soil depth of different degradation severity grasslands (mean ± SD). Different lowercase letters indicate significant differences among different degradation severities in the same soil layer; different uppercase letters indicate significant differences between different soil layers at the same degradation severity (p < 0.05).

图2 不同退化程度草地土壤木质素酚类物质归一化含量(平均值±标准差)。不同小写字母表示相同土层不同退化程度之间有显著差异; 不同大写字母表示相同退化程度不同土层之间有显著差异(p < 0.05)。

Fig. 2 Normalized content of lignin phenols of different degradation severity grasslands. SOC, soil organic carbon content (mean ± SD). Different lowercase letters indicate significant differences among different degradation severities in the same soil layer; different uppercase letters indicate significant differences between different soil layers at the same degradation severity (p < 0.05).

图3 不同深度草地土壤中木质素酚类物质含量和土壤有机碳含量相关性。

Fig. 3 Correlation between the content of lignin phenols and the soil organic carbon (SOC) of different soil depth.

图4 不同退化程度草地土壤中catA基因(A)和顺,顺-已二烯二酸(B)丰度(平均值±标准差)。不同小写字母表示相同土层不同退化程度之间有显著差异, 不同大写字母表示相同退化程度不同土层之间有显著差异(p < 0.05)。

Fig. 4 Abundance of catA gene (A) and cis,cis-muconic acid (B) in different degradation severity grasslands (mean ± SD). Different lowercase letters indicate significant differences among different degradation severities in the same soil layer, and different uppercase letters indicate significant differences between different soil layers at the same degradation severity (p < 0.05).

图5 退化草地不同深度土壤中catA基因丰度与顺,顺-已二烯二酸丰度(A)和木质素酚类物质含量(B)相关性。

Fig. 5 Correlation between the abundance of catA and cis,cis-muconic acid (A) and the content of lignin phenols (B) of different degraded grasslands soil depth.

图6 退化草地不同深度土壤中catA基因丰度(A)、顺,顺-已二烯二酸丰度(B)与土壤有机碳含量相关性。

Fig. 6 Correlation between the abundance of catA (A) and cis,cis-muconic acid (B) and the soil organic carbon (SOC) content of different degraded grasslands soil depth.

图7 退化草地不同深度土壤中catA基因丰度与香草基酚类物质的酸醛比(A)、丁香基酚类的酸醛比(B)相关性。Ad/Al, 酸醛比; s, 丁香基酚类物质; v, 香草基酚类物质。

Fig. 7 Correlation between the abundance of catA and the acid-aldehyde ratio of vanillyl (A) and eugenol (B) of different degraded grasslands in different degraded grasslands soil depth. Ad/Al, acid-aldehyde ratio; s, eugenol; v, vanillyl.

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木质素酚类物质对内蒙古退化草地土壤有机碳的影响

Influence of lignin phenols on soil organic carbon in degraded grassland in Nei Mongol, China

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