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	Antagonistic effects of drought and sand burial enable the survival of the biocrust moss Bryum argenteum in an arid sandy desert
	Jia, Rongliang1; Zhao, Yun1; Gao, Yanhong1; Hui, Rong1; Yang, Haotian1; Wang, Zenru1; Li, Yixuan2
刊名	BIOGEOSCIENCES
	2018-02-23
卷号	15期号:4页码:1161-1172
ISSN号	1726-4170
DOI	10.5194/bg-15-1161-2018
通讯作者	Jia, Rongliang(rongliangjia@163.com)
英文摘要	Biocrust moss is an essential soil surface biocover. It can represent the latest succession stage among the diverse range of surface-dwelling cryptogams (e.g., cyanobacteria, green algae, and lichen, which are also referred to as biocrusts), and it can make a major contribution to soil stability and fertility in many arid sandy desert ecosystems. The soil surface represents a very large ecological niche that is poikilohydric in nature. Biocrust moss is therefore highly susceptible to drought and sand burial, which are two ubiquitous stressors in arid sandy deserts. However, little information is available regarding the mechanism by which biocrust moss can survive and flourish in these habitats when stressed simultaneously by the two stressors. The combined effects of drought and sand burial were evaluated in a field experiment using the predominant biocrust moss, Bryum argenteum Hedw., in the Tengger Desert, China. Drought was simulated by applying distilled water in three artificial rainfall regimes at 8-day intervals in spring and autumn: 4 and 6mm (average rainfall, control), 2 and 3mm (double drought), and 1 and 1.5mm (4-fold drought), respectively. The effect of sand burial was determined by applying six treatments, i.e., sand depths of 0 (control), 0.5, 1, 2, 4, and 10 mm. The four parameters of chlorophyll a content, PSII photochemical efficiency, regeneration potential, and shoot upgrowth were evaluated in the moss. It was found that the combined effects of drought and sand burial did not exacerbate the single negative effects of the four parameters tested. Drought significantly ameliorated the negative effects of deep-sand burial on the retention of chlorophyll a content, PSII photochemical efficiency, and the regeneration potential of B. argenteum. Sand burial diminished and even re-versed the negative effects of drought on the maintenance of chlorophyll a content, PSII photochemical efficiency, and regeneration potential. Although drought and sand burial imposed an additive negative effect on shoot upgrowth, which suggested a trade-off between growth ability and stress tolerance, their mutually antagonistic effect on the physiological vigor of B. argenteum provided an opportunity for the biocrust moss to overcome the two co-occurring stressors. In addition to providing a strong stress tolerance, drought and sand burial may provide an important mechanism for the biodiversity maintenance of biocrust mosses in arid sandy ecosystems.
收录类别	SCI
WOS关键词	BIOLOGICAL SOIL CRUSTS ; NORTHERN CHINA ; TENGGER DESERT ; MOJAVE DESERT ; DESICCATION ; RESPONSES ; STRESS ; MICRODISTRIBUTION ; CYANOBACTERIA ; DISTURBANCE
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS类目	Ecology ; Geosciences, Multidisciplinary
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000426012200004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558090
专题	寒区旱区环境与工程研究所
通讯作者	Jia, Rongliang
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Shapotou Desert Res & Expt Stn, 320 Donggang West Rd, Lanzhou 730000, Gansu, Peoples R China 2.Agr Univ Shenyang, Agron Coll, Shenyang 110866, Liaoning, Peoples R China
推荐引用方式 GB/T 7714	Jia, Rongliang,Zhao, Yun,Gao, Yanhong,et al. Antagonistic effects of drought and sand burial enable the survival of the biocrust moss Bryum argenteum in an arid sandy desert[J]. BIOGEOSCIENCES,2018,15(4):1161-1172.
APA	Jia, Rongliang.,Zhao, Yun.,Gao, Yanhong.,Hui, Rong.,Yang, Haotian.,...&Li, Yixuan.(2018).Antagonistic effects of drought and sand burial enable the survival of the biocrust moss Bryum argenteum in an arid sandy desert.BIOGEOSCIENCES,15(4),1161-1172.
MLA	Jia, Rongliang,et al."Antagonistic effects of drought and sand burial enable the survival of the biocrust moss Bryum argenteum in an arid sandy desert".BIOGEOSCIENCES 15.4(2018):1161-1172.

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