干旱区生态环境知识资源中心(Arid): Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the delta C-13 in the soil-root interface

Arid

DOI	10.1007/s11104-019-04223-6
	Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the delta C-13 in the soil-root interface
	Rovira, Pere 1; Aranjuelo, Iker 2,3,4; Nowak, Robert S.3; Nogues, Salvador 4
通讯作者	Rovira, Pere
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2019
卷号	443 期号:1-2 页码:307-322
英文摘要	Background and aims The tracing of C assimilation and the subsequent partitioning among plant organs has been a central focus of studies utilising Free Air CO2 Enrichment (FACE) facilities. The approach makes use of the fossil origin of this carbon, which is depleted in C-13. However, there is little data for desert environments. The Nevada Desert FACE Facility (NDFF), located in the Mojave Desert, has been one of the main facilities for the study of C dynamics in arid ecosystems and how they respond to rising atmospheric CO2 concentrations. In this experiment, we studied the incorporation of fixed CO2 during the previous two years (detectable by its lower delta C-13) in the soil fraction surrounding roots. Methods The soil was collected monthly in direct vicinity to the roots during a complete growth season, at two depths (5 and 15 cm). Soil samples were dried and fractionated by size (> 50 mu m and < 50 mu m) by wet sieving, and both size fractions were then analysed for the delta C-13 of their organic matter and their carbonates. Results In the coarse fraction (> 50 mu m), delta C-13 values ranged between -1 and - 2 parts per thousand for carbonates and between -23 and - 25 parts per thousand for soil organic matter. These values did not significantly change throughout the experiment and were not affected by depth (5 or 15 cm). In contrast, delta C-13 values for both organic and inorganic carbon in the fine fraction (< 50 mu m) were much more variable than in the coarse fraction (> 50 mu m). The delta C-13 values for organic C ranged mostly between -20 parts per thousand and - 27 parts per thousand, and were roughly maintained throughout the sampling period. For inorganic C, the delta C-13 values were mostly between 0 parts per thousand and - 15 parts per thousand, and tended to become less negative during the course of the sampling period. Overall the effect of [CO2] on delta C-13 values of either organic or inorganic carbon was not significant for any experimental condition (plant species, soil depth, soil fraction). Conclusion Little or no signs of recently fixed CO2 (C-13-depleted) were detected in the soils close to the roots, in the coarse fraction (> 50 mu m), the fine fraction (< 50 mu m), the organic matter, or in carbonates. This indicates a slow C turnover in the studied soils, which can result from a highly conservative use of photoassimilates by plants, including a very low release of organic matter into the soil in the form of dead roots or root exudates, and from a conservative use of available C reserves.
英文关键词	Climate change Carbon cycle FACE experiments Soil organic matter turnover Carbonates Desert plants Carbon isotopes Root exudates
类型	Article
语种	英语
国家	Spain ; USA
开放获取类型	Green Accepted
收录类别	SCI-E
WOS记录号	WOS:000493661800020
WOS关键词	ELEVATED ATMOSPHERIC CO2 ; MOJAVE-DESERT ; LONG-TERM ; ENRICHMENT FACE ; LITTER QUALITY ; LEAF-LITTER ; COMMUNITY STRUCTURE ; ORGANIC-MATTER ; DECOMPOSITION ; DYNAMICS
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
EI主题词	2019-10-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310199
作者单位	1.Forest Sci Ctr Catalonia CTFC, CEMFOR, Carretera St Llorenc de Morunys,Km 2, Solsona 25280, Spain; 2.Univ Publ Navarra, Gobiemo Navarra, Inst Agrobiotecnol IdAB, CSIC, Ave Pamplona 123, Mutilva Baja 31192, Spain; 3.Univ Nevada, Dept Nat Resources & Environm Sci, Reno, NV 89557 USA; 4.Univ Barcelona, Dept Evolutionary Biol Ecol & Environm Sci, Plant Physiol Sect, Fac Biol, Diagonal 645, E-08028 Barcelona, Spain
推荐引用方式 GB/T 7714	Rovira, Pere,Aranjuelo, Iker,Nowak, Robert S.,et al. Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the delta C-13 in the soil-root interface[J],2019,443(1-2):307-322.
APA	Rovira, Pere,Aranjuelo, Iker,Nowak, Robert S.,&Nogues, Salvador.(2019).Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the delta C-13 in the soil-root interface.PLANT AND SOIL,443(1-2),307-322.
MLA	Rovira, Pere,et al."Limited carbon inputs from plants into soils in arid ecosystems: a study of changes in the delta C-13 in the soil-root interface".PLANT AND SOIL 443.1-2(2019):307-322.