Vertical variations in plant- and microbial-derived carbon components in grassland soils

NWIPB OpenIR

	Vertical variations in plant- and microbial-derived carbon components in grassland soils
	Ma, Tian; Dai, Guohua; Zhu, Shanshan; Chen, Dima; Chen, Litong; Lu, Xiao-Tao; Wang, Xiaobo; Zhu, Juntao; Zhang, Yangjian; He, Jin-Sheng; Bai, Yongfei; Han, Xingguo; Feng, Xiaojuan
	2020
发表期刊	PLANT AND SOIL
卷号	446 期号:2020-01-02
摘要	Aims Owing to different soil environments and organic carbon sources, soil organic carbon (SOC) composition and preservation mechanisms may vary substantially in deep versus surface soils. This study examines vertical variation of various SOC components (including lignin phenols, cutin, suberin and microbial lipids) across the Chinese-Mongolian grasslands. Methods Lignin phenols and hydrolysable lipids were isolated by cupric oxide oxidation and alkaline hydrolysis, respectively. A comprehensive list of environmental variables was compiled to disentangle influencing factors for the variation of various components at four different depths. Results Lignin phenols, suberin and microbial lipids were most abundant in the surface soil (0-10 cm). Ratios of cutin to suberin and microbial lipids to lignin phenols (in the alpine grasslands) were higher in the bottom-most soil. Calcium (Ca) rather than iron (Fe) plays an important role in the preservation of cutin and microbial lipids in the bottom soil with a high Ca:Fe ratio and high pH. The incorporation efficiency of suberin was higher in deeper than surface soils and showed an increasing trend with depth in the alpine (but not temperate) grasslands. Conclusions Compared to surface soils, the incorporation of root-derived carbon into SOC is more efficient in deeper soils due to stronger mineral protection and weaker microbial decomposition. Root-derived carbon is more important for SOC accrual in the alpine than temperate grasslands, especially at depth. These findings reveal differential distribution patterns and preservation mechanisms for SOC components in the surface versus deep soils, providing new information to understand SOC stability at different depths.
关键词	Deep soils Distribution patterns Preservation mechanisms Soil organic carbon Chinese-Mongolian grasslands
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/60468
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Ma, Tian,Dai, Guohua,Zhu, Shanshan,et al. Vertical variations in plant- and microbial-derived carbon components in grassland soils[J]. PLANT AND SOIL,2020,446(2020-01-02).
APA	Ma, Tian.,Dai, Guohua.,Zhu, Shanshan.,Chen, Dima.,Chen, Litong.,...&Feng, Xiaojuan.(2020).Vertical variations in plant- and microbial-derived carbon components in grassland soils.PLANT AND SOIL,446(2020-01-02).
MLA	Ma, Tian,et al."Vertical variations in plant- and microbial-derived carbon components in grassland soils".PLANT AND SOIL 446.2020-01-02(2020).