干旱区生态环境知识资源中心(Arid): Landscape position and slope aspects impacts on soil organic carbon pool and biological indicators of a fragile ecosystem in high-altitude cold arid region

Arid

DOI	10.1007/s42729-022-00831-x
	Landscape position and slope aspects impacts on soil organic carbon pool and biological indicators of a fragile ecosystem in high-altitude cold arid region
	Sharma, Sandeep; Singh, Pritpal; Chauhan, Sanjeev; Choudhary, O. P.
通讯作者	Sharma, S
来源期刊	JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
ISSN	0718-9508
EISSN	0718-9516
出版年	2022
卷号	22 期号:2 页码:2612-2632
英文摘要	Purpose To study the impact of altitudinal variation along the north and south facing slope aspects characterized by diverse native vegetation on soil organic carbon (C) dynamics due to change in soils biological attributes. Methods The differences in soil biological properties for the Tanglang La region in Ladakh characterized by super low temperature regime at high altitudes that impacts the rates of C turnover along the north and south facing slopes were investigated. We studied the loss in total organic C stocks at different altitudinal gradients viz. summit, shoulder, back-slope, foot-slope and toe-slope positions along the north and south facing slopes to quantify the potential of C sequestration following appropriate interventions. Results The very labile C (Fract. 1) + labile C (Fract. 2) together constitutes 19.2 and 15.3% of total organic carbon (TOC) in soils at summit along north and south facing slope aspects, respectively. At shoulder and back-slope positions, labile C pool (Fract. 1 + Fract. 2) increased significantly (p < 0.05); comprised 31.0-36.4% of TOC along north facing slopes, and 25.8-37.3% along the south facing slopes. Conversely, the toe-slope had a significantly higher proportion of recalcitrant C pool, compared with the soils at high-altitudinal gradients. Notwithstanding the occurrence of high concentration of labile C pool at shoulder, back-slope and foot-slope, these landscape positions were significantly depleted of water extractable organic C (WEOC) and microbial biomass C (MBC) due to loss of soil related protein, i.e., total glomalin (TG) and the easily extractable glomalin (EEG). The TOC deposition (by 17.1%) at toe-slope positions along north and south facing slopes occurred with increased acid phosphatase (by 199 and 217%), dehydrogenase (by 50 and 91%), fluorescein diacetate (by 50 and 95%) activity, compared with the eroded landscapes. At summit, TOC stocks were significantly higher by 1.1-3.4 Mg C ha(-1) along the north facing slopes, and by 1.4-3.5 Mg C ha(-1) along with the south facing slopes, compared with other altitudinal gradients. Conclusions Results revealed significant potential for soil C sequestration at shoulder and back-slope through aforestation or by growing native grasses and reducing grazing pressure in cold arid region of Ladakh.
英文关键词	Slope aspects Solar radiation exposure Soil organic C pools Soil microbial activity Soil C sequestration Non-labile C
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000781188300001
WOS关键词	LAND-USE CHANGE ; ARBUSCULAR MYCORRHIZAL FUNGI ; MICROBIAL BIOMASS CARBON ; ENZYME-ACTIVITIES ; CONSERVATION AGRICULTURE ; METABOLIC QUOTIENT ; MANAGEMENT INDEX ; SEDIMENT YIELD ; FOREST ; EROSION
WOS类目	Plant Sciences ; Environmental Sciences ; Soil Science
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393583
推荐引用方式 GB/T 7714	Sharma, Sandeep,Singh, Pritpal,Chauhan, Sanjeev,et al. Landscape position and slope aspects impacts on soil organic carbon pool and biological indicators of a fragile ecosystem in high-altitude cold arid region[J],2022,22(2):2612-2632.
APA	Sharma, Sandeep,Singh, Pritpal,Chauhan, Sanjeev,&Choudhary, O. P..(2022).Landscape position and slope aspects impacts on soil organic carbon pool and biological indicators of a fragile ecosystem in high-altitude cold arid region.JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION,22(2),2612-2632.
MLA	Sharma, Sandeep,et al."Landscape position and slope aspects impacts on soil organic carbon pool and biological indicators of a fragile ecosystem in high-altitude cold arid region".JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION 22.2(2022):2612-2632.