Assessment of carbon gains from biocrusts inhabiting a dunefield in the Negev Desert (SCI)

CORC > 寒区旱区环境与工程研究所 > 中科院寒区旱区环境与工程研究所（未分类） > 期刊论文

	Assessment of carbon gains from biocrusts inhabiting a dunefield in the Negev Desert (SCI)
	Kidron G. J.; Li X. R.; Jia R. L.; Gao Y. H.; Zhang P.
刊名	Geoderma
	2015
卷号	253 页码:102-110
英文摘要	Biocrusts play an important role in carbon (C) assimilation in arid and semiarid regions. In order to assess C gain in the crusted Hallamish dune field, net photosynthesis (Pn) and respiration (R) were measured at five crust types (A-E) which show a gradual increase in their chlorophyll content (with A < B < C < D < E). Pn and R were calculated per chlorophyll a and b (hereafter a/b) content. Total C input was calculated based on a large database that includes data on the temporal change in the chlorophyll content during the winter growing season, annual daylight and nighttime wetness duration and the cover of each crust type. The data show high similarity of Pn and R per chlorophyll content for all crusts (0.9-1.1 and 0.5-0.6 gC (Chla/b)(-1) h(-1), respectively). Both Pn and R showed a gradual increase with chlorophyll content with A approximate to B < C < D < E, with Pn ranging between 0.0311 (for crust A) and 0.1784 (for crust E) gC m(-1) h(-1). Total calculated C gain for crusts A-E assuming total crust cover ranged between 2.1-8.6 gC m(-2) a(-1) for crusts A-D and 50.90 gC m(-2) a(-1) for crust E, with total annual input into the crusted areas of the ecosystem and the entire ecosystem being 3.7 and 23 gC m(-2) a(-1), respectively. In comparison to net ecosystem C exchange (NEE) from arid regions, our findings highlight the important role played by biocrusts in CO2 sequestration and as C provider for an extreme arid ecosystem. Yet, although a conservative approach was adopted, the data should be regarded as rough estimation only. In-situ field measurements are still required in order to substantiate the crust role in the annual C gain. (C) 2015 Elsevier B.V. All rights reserved.
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.casnw.net/handle/362004/27277]
专题	寒区旱区环境与工程研究所_中科院寒区旱区环境与工程研究所（未分类）_期刊论文
推荐引用方式 GB/T 7714	Kidron G. J.,Li X. R.,Jia R. L.,et al. Assessment of carbon gains from biocrusts inhabiting a dunefield in the Negev Desert (SCI)[J]. Geoderma,2015,253:102-110.
APA	Kidron G. J.,Li X. R.,Jia R. L.,Gao Y. H.,&Zhang P..(2015).Assessment of carbon gains from biocrusts inhabiting a dunefield in the Negev Desert (SCI).Geoderma,253,102-110.
MLA	Kidron G. J.,et al."Assessment of carbon gains from biocrusts inhabiting a dunefield in the Negev Desert (SCI)".Geoderma 253(2015):102-110.