干旱区生态环境知识资源中心(Arid): Rhizosphere effects promote soil aggregate stability and associated organic carbon sequestration in rocky areas of desertification

Arid

DOI	10.1016/j.agee.2020.107126
	Rhizosphere effects promote soil aggregate stability and associated organic carbon sequestration in rocky areas of desertification
	Li, Junya; Yuan, Xiaoliang; Ge, Le; Li, Qian; Li, Zhiguo; Wang, Li; Liu, Yi
通讯作者	Liu, Y
来源期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
EISSN	1873-2305
出版年	2020
卷号	304
英文摘要	Soil aggregate stability is an important index for predicting soil water loss and soil erosion resistance. Plant roots effectively control soil erosion and stabilize soil structure, which has a crucial influence on the formation of aggregates and soil organic carbon (SOC) sequestration. We examined how rhizosphere effects influence soil aggregate stability and its associated SOC contents and delta C-13 values, following a proposed extended model of carbon (C) flows between the aggregate size classes in the root systems based on C-13 fractionation in each step of SOC formation. The results show that the rhizosphere effects significantly improved the stability of aggregates. The mean weight diameter (MWD) and geometric mean diameter (GMD) of rhizosphere soil aggregates were significantly higher than those of non-rhizosphere soil aggregates associated with plants with fibrous roots. SOC levels of all size aggregates in the rhizosphere soil of both fibrous and tap root plants were higher than those of non-rhizosphere soil. Moreover, SOC contents increased in the order of silt-clay particles (SCP, <0.05 mm), microaggregates (MIA, 0.05-0.25 mm) and small macroaggregates (SMA, 0.25-1 mm), and then decreased from SMA to large macroaggregates (LMA,> 1 mm). The delta C-13 values in non-rhizosphere soil were generally higher than those in rhizosphere soil in aggregates of the same size class, especially in the tap root plants. Except for the rhizosphere soil of fibrous root plants, the other three soil types (rhizosphere and non-rhizosphere soil of tap root plants, and non-rhizosphere soil of fibrous root plants) were shown to have aggregate delta C-13 values that decreased with increasing soil aggregate size. delta C-13 enrichment of the SOC fractions showed that the general flow direction of SOC was from rhizosphere to non-rhizosphere, and from large aggregates to small aggregates. The C flow in the aggregates of rhizosphere soil was clearly greater than that in the non-rhizosphere soil, especially with the fibrous root plants. These findings suggest that plant roots have the potential to regulate soil structural stability, and enhance soil erosion resistance and SOC sequestration.
英文关键词	Root system Soil aggregate diameter C-13 natural abundance Carbon flow
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000581101600009
WOS关键词	MICROBIAL COMMUNITY STRUCTURE ; ROOT ; NITROGEN ; DYNAMICS ; EROSION ; FRACTIONATION ; PHOSPHORUS ; DETACHMENT ; VEGETATION ; STRENGTH
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327029
作者单位	[Li, Junya; Yuan, Xiaoliang; Li, Zhiguo; Wang, Li; Liu, Yi] Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China; [Liu, Yi] Chinese Acad Sci, Core Bot Gardens, Ctr Plant Ecol, Wuhan 430074, Peoples R China; [Li, Junya; Yuan, Xiaoliang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Ge, Le; Li, Qian] Nature Conservancy, Beijing 100600, Peoples R China
推荐引用方式 GB/T 7714	Li, Junya,Yuan, Xiaoliang,Ge, Le,et al. Rhizosphere effects promote soil aggregate stability and associated organic carbon sequestration in rocky areas of desertification[J],2020,304.
APA	Li, Junya.,Yuan, Xiaoliang.,Ge, Le.,Li, Qian.,Li, Zhiguo.,...&Liu, Yi.(2020).Rhizosphere effects promote soil aggregate stability and associated organic carbon sequestration in rocky areas of desertification.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,304.
MLA	Li, Junya,et al."Rhizosphere effects promote soil aggregate stability and associated organic carbon sequestration in rocky areas of desertification".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 304(2020).