气候变化领域集成服务门户(CCPortal): Variation of soil carbon accumulation across a topographic gradient in a humid subtropical mountain forest

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DOI	10.1007/s10533-020-00679-2
	Variation of soil carbon accumulation across a topographic gradient in a humid subtropical mountain forest
	Tian Q.; Wang D.; Li D.; Huang L.; Wang M.; Liao C.; Liu F.
发表日期	2020
ISSN	0168-2563
起始页码	337
结束页码	354
卷号	149 期号:3
英文摘要	Topography is tightly coupled with soil organic carbon (SOC) cycling in sloping landscapes. However, we know little about the spatial variation of SOC accumulation and persistence along a topographic gradient and the controlling processes. Here, we assessed the spatial variation of SOC and its composition along a topographic gradient in a humid mountain forest. The variables associated with environmental factors, topographical traits, carbon input from plants, and soil physico-chemical properties were analyzed to assess their contributions. Results showed that both SOC and mineral-bound organic carbon (MOC) contents were comparable among the topographic positions (ridge, middle slope, lower slope and valley). However, particulate organic carbon (POC) content decreased significantly from ridge to valley. Our measured environmental variables explained 67%, 74% and 77% of the variations in SOC contents for 0–10 cm, 10–20 cm and 20–40 cm soils, respectively. Soil physico-chemical properties (including pH and soil reactive Fe/Al oxides) were the main driver on SOC and MOC variations. In contrast, the variation in POC was more explained by topographical traits and carbon input. We also observed significantly lower SOC stability for ridge soil than valley soil. The significant topographic patterns for SOC fraction and SOC stability suggested that the soil carbon cycling processes were dependent on landscape positions. Future carbon budget and carbon dynamic researches in the humid sloping landscapes should take into account the topographic effects, especially for the free and light carbon fractions. © 2020, Springer Nature Switzerland AG.
英文关键词	Carbon fractions; Carbon stability; Carbon storage; Chemical association; Particulate organic carbon; Topographic position
语种	英语
scopus关键词	carbon budget; environmental factor; landscape; montane forest; particulate organic carbon; physicochemical property; soil carbon; spatial variation; subtropical region; topography
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153122
作者单位	CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, China; Center of Plant Ecology, Core Botanical Gardens, Chinese Academy of Sciences, Wuhan, 430074, China; University of Chinese Academy of Sciences, Beijing, 100049, China; College of Science, Tibet University, Lasa, 850000, China
推荐引用方式 GB/T 7714	Tian Q.,Wang D.,Li D.,et al. Variation of soil carbon accumulation across a topographic gradient in a humid subtropical mountain forest[J],2020,149(3).
APA	Tian Q..,Wang D..,Li D..,Huang L..,Wang M..,...&Liu F..(2020).Variation of soil carbon accumulation across a topographic gradient in a humid subtropical mountain forest.Biogeochemistry,149(3).
MLA	Tian Q.,et al."Variation of soil carbon accumulation across a topographic gradient in a humid subtropical mountain forest".Biogeochemistry 149.3(2020).