The variation characteristics of particulate organic carbon and mineral-associated organic carbon during the development of Metasequoia glyptostroboides plantations

doi:10.12302/j.issn.1000-2006.202309037

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2025, Vol. 49 ›› Issue (3): 25-32.doi: 10.12302/j.issn.1000-2006.202309037

The variation characteristics of particulate organic carbon and mineral-associated organic carbon during the development of Metasequoia glyptostroboides plantations

ZHAI Ningning¹(), SHI Ke¹, RUAN Honghua¹^,^*(), NI Juanping¹, FANG Yu¹, CAO Guohua², SHEN Caiqin², XU Yaming², HUO Jianjun³

1. Co-Innovation Center for Sustainable Forestry in Southern China, College of Ecology and Environment, Nanjing Forestry University, Nanjing 210037, China
2. Dongtai Forest Farm of Jiangsu Province, Yancheng 224243, China
3. Sihong County Forestry Science and Technology Extension Center, Suqian 223900, China

Received:2023-09-27 Accepted:2024-12-07 Online:2025-05-30 Published:2025-05-27
Contact: RUAN Honghua E-mail:18951802663@163.com;hhruan@njfu.edu.cn

Abstract

Abstract:

【Objective】Plantations play significant roles in mitigating climate change. Understanding the dynamics of soil organic carbon (SOC), particularly through its key components—particulate organic carbon (POC) and mineral-associated organic carbon (MAOC)—is crucial for predicting carbon sequestration in soil.【Method】This study investigated Metasequoia glyptostroboides plantations of varying ages (7, 16, 21, 26, 31, 36, 42 and 46 a) located in the Dongtai Forest Farm, Jiangsu Province. For each forest age, four replicated field plots were established, and soil samples were collected from five distinct depths: [0, 20), [20, 40), [40, 60), [60, 80), and [80, 100) cm. A range of soil physicochemical properties—including pH, ammonium nitrogen, nitrate nitrogen, total phosphorus, and available phosphorus—along with SOC fractions (POC and MAOC) were measured to examine the variation in POC and MAOC with the development of the plantations.【Result】POC in the [0, 20) cm soil layer was the dominant contributor to the soil organic carbon pool, and its accumulation was enhanced during the plantation’s development. Conversely, MAOC was the predominant fraction in the [20, 40) cm soil layer, but its response to stand age and development was less pronounced. As the forest age increased, the stability of SOC in the [0, 20) cm layer declined, making it more susceptible to decomposition and utilization. In contrast, SOC stability in the [20, 100) cm layers remained higher, supporting longer-term organic carbon storage. Correlation analysis revealed that POC was more responsive to environmental changes driven by stand development compared to MAOC.【Conclusion】As plantations mature, soil organic carbon accumulates primarily in the surface layer [(0, 20) cm] in the form of POC. The greatest accumulation occurs during the over-mature stage of the forest. Long-term plantation development significantly enhances the accumulation and retention of different fractions of surface soil organic carbon. Therefore, extending the primary cutting age of plantations would further optimize their role in mitigating global climate change.

Key words: Metasequoia glyptostroboides plantations, particulate organic carbon(POC), mineral-associated organic carbon(MAOC), stand development, deep soil

CLC Number:

S715.8
Q89

ZHAI Ningning, SHI Ke, RUAN Honghua, NI Juanping, FANG Yu, CAO Guohua, SHEN Caiqin, XU Yaming, HUO Jianjun. The variation characteristics of particulate organic carbon and mineral-associated organic carbon during the development of Metasequoia glyptostroboides plantations[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2025, 49(3): 25-32.

Figures/Tables 6

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Table 2

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林龄/a age	平均树高/m mean tree height	平均胸径/cm mean DBH	林分密度/(株·hm^-2) stand density	地表温度/℃ soil surface temperature	凋落物现存量/(g·m^-2) existing litter biomass
7	8.2±0.8	10.5±0.5	294 2	5.5±0.2	751.8±40.4
16	20.1±0.9	20.9±1.9	117 5	5.8±0.3	530.6±138.0
21	22.4±1.4	25.8±1.5	122 5	5.6±0.2	608.7±37.4
26	22.9±0.3	27.0±1.7	575	5.2±0.4	649.2±121.5
31	23.2±1.1	27.4±2.4	667	6.1±0.5	529.3±72.6
36	25.1±2.5	30.5±1.5	463	6.6±0.4	631.5±52.4
42	26.6±1.2	34.2±2.0	655	5.8±0.6	552.9±55.7
46	26.1±0.5	33.2±1.8	455	6.0±0.6	514.8±69.6

因子 factor	林龄 forest age
因子 factor	F	P	F	P	F	P
颗粒有机碳含量POC content	6.11	<0.01	201.85	<0.01	3.73	<0.01
矿物结合有机碳含量 MAOC content	2.56	<0.05	0.48	0.75	1.49	0.08
土壤有机碳含量SOC content	5.67	<0.01	160.99	<0.01	3.93	<0.01
矿物结合有机碳含量/土壤有机碳含量MAOC/SOC	3.76	<0.01	97.21	<0.01	1.59	<0.05
颗粒有机碳含量/土壤有机碳含量POC/SOC	5.20	<0.01	116.38	<0.01	1.78	<0.05
颗粒有机碳含量/矿物结合有机碳含量POC/MAOC	5.58	<0.01	172.43	<0.01	2.74	<0.01

The variation characteristics of particulate organic carbon and mineral-associated organic carbon during the development of Metasequoia glyptostroboides plantations

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