[Characteristics of soil organic carbon components across a chronosequence of Cryptomeria japonica plantations in Rainy Area of Western China].

Q3 Environmental Science
Yue-Han Wang, Rui Wang, Yu Li, Cheng-Ming You, Lin Xu, Hong-Wei Xu, Bo Tan, Zhen-Feng Xu
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引用次数: 0

Abstract

Soil organic carbon (SOC) components are crucial indicators of soil fertility and carbon sequestration capacity, playing a pivotal role in maintaining global carbon balance. However, the dynamics of SOC components across plantations with different stand ages remain poorly understood. In this study, we collected soil samples (0-15 cm and 15-30 cm) from 7, 13, 24, 33 and 53 years stands of Cryptomeria japonica plantations in the Rainy Area of Western China to quantify the contents of different SOC components, including particulate organic carbon (POC), easily oxidized organic carbon (EOC), light fraction organic carbon (LFOC), heavy fraction organic carbon (HFOC), labile organic carbon (LOC), and inert organic carbon (IOC). The results showed that: 1) POC content increased continuously with stand age, while contents of LOC, EOC, LFOC, HFOC, and IOC followed unimodal patterns, peaking at 24- and 33-year-old stands. 2) All SOC components were significantly higher in surface layer (0-15 cm) than subsurface layer (15-30 cm). The differences in POC and LFOC between two soil layers increased with stand ages, while EOC and LOC exhibited maximal inter-layer differences at 24 and 33 years, respectively. 3) Results of variance partitioning analysis showed that microbial variables (fungal and bacterial biomass, and enzyme activities) exerted stronger explanatory power on POC variation than soil physicochemical pro-perties. Other SOC components were co-regulated by both biological and physiochemical factors. Partial least squares path modeling further demonstrated that stand age directly influenced POC and indirectly modulated all SOC components by mediating soil physicochemical and microbial characteristics. In all, our findings suggested that there were distinct age-dependent patterns in SOC components in C. japonica plantation and their vertical stratification were driven by stand age-associated changes in soil microbial and physiochemical properties. This study would be helpful for understanding soil carbon sequestration along plantation development, and could offer scientific basis for enhancing carbon sink functions in C. japonica plantation.

[中国西部多雨地区柳杉人工林土壤有机碳组分的时序特征]。
土壤有机碳(SOC)组分是土壤肥力和固碳能力的重要指标,在维持全球碳平衡中起着关键作用。然而,不同林龄林分土壤有机碳组分的动态变化尚不清楚。本研究以中国西部阴雨地区柳杉人工林7、13、24、33和53年树龄的土壤样品(0 ~ 15 cm和15 ~ 30 cm)为研究对象,定量分析了不同土壤有机碳组分的含量,包括颗粒有机碳(POC)、易氧化有机碳(EOC)、轻组分有机碳(LFOC)、重组分有机碳(HFOC)、活性有机碳(LOC)和惰性有机碳(IOC)。结果表明:1)随着林龄的增长,POC含量呈持续上升趋势,而LOC、EOC、LFOC、HFOC和IOC含量呈单峰模式,分别在24和33年林龄达到峰值。2)各有机碳组分在表层(0 ~ 15 cm)均显著高于亚表层(15 ~ 30 cm)。土壤POC和LFOC的差异随着林龄的增加而增大,而EOC和LOC的层间差异在林龄24年和林龄33年最大。3)方差划分分析结果表明,微生物变量(真菌和细菌生物量以及酶活性)对POC变化的解释力强于土壤理化性质。其他有机碳组分受生物和理化因素共同调控。偏最小二乘路径模型进一步表明,林龄通过调节土壤理化和微生物特性,直接影响POC,间接调节各有机碳组分。综上所述,粳稻人工林有机碳组分存在明显的年龄依赖性,其垂直分层受林龄相关土壤微生物和理化性质变化的驱动。该研究有助于了解人工林发展过程中土壤固碳的情况,为提高粳稻人工林的碳汇功能提供科学依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
应用生态学报
应用生态学报 Environmental Science-Ecology
CiteScore
2.50
自引率
0.00%
发文量
11393
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