中文版 | English
Arid
DOI10.1016/j.catena.2019.104120
The dual effect of sand-covered biocrusts on annual plants: Increasing cover but reducing individual plant biomass and fecundity
Kidron, Giora J.
通讯作者Kidron, Giora J.
来源期刊CATENA
ISSN0341-8162
EISSN1872-6887
出版年2019
卷号182
英文摘要It is generally accepted that biological soil crusts promote the growth of vascular plants. Nevertheless, contradictory results were recently found for annual plants in the extreme desert duncficld of the Negev (average precipitation of 95 mm) during extreme drought years, explained by the lower available water content (AWC) under the low-albedo biocrusted surfaces at the interdune (ID). Trying to assess whether the biomass and fecundity of the annual plants is higher at the non-crusted dune crest (CR) in comparison to ID also during years with near-average precipitation, surface stability, rain, AWC, fine (silt and clay) content (FC), and soil organic carbon (SOC) were measured in a pair of plots established in CR and ID in two dunes and interdunes. The research was conducted for three years (2009/2010, 2013/14 and 2014/15), having a mean precipitation of 109.4 mm. At the end of each winter, sampling of the annual plants (cover, density, species composition, biomass) took place at CR and ID at 30 cm-diameter miniplots (miniplot-scale), while the biomass and fecundity of 50 randomly-chosen individuals that abundantly inhabited both habitats during the same year were measured at parallel transects (individual plant-scale). Significantly higher cover and generally higher diversity characterized the plants at ID at the miniplot-scale, explained by the higher surface stability. Although characterized by lower FC and SOC, significantly higher biomass and fecundity characterized the individual plants at CR, explained by the higher AWC. Biocrusts were found to have a dual effect on the annual plants: positive due to increased surface stability (cover and for most years also diversity) at the miniplot-scale, and negative due to reduced AWC (low biomass and fecundity) at the individual plant-scale. The higher biomass and fecundity of the individual plants at CR point to the cardinal role played by water (rather than SOC) in this low-nutrient extreme desert. As far the annual plants are concerned, these findings also point at the fact that moderate crust destruction (such as by light trampling) may not necessarily be hazardous to the ecosystem, as it may increase fecundity and subsequently germination success.
英文关键词Available water content Evaporation Negev Desert Soil moisture
类型Article
语种英语
国家Israel
收录类别SCI-E
WOS记录号WOS:000482493700029
WOS关键词BIOLOGICAL SOIL CRUSTS ; NORTH-WESTERN NEGEV ; ARID DUNE AREA ; DESERT DUNES ; WATER RELATIONS ; MICROBIOTIC CRUSTS ; MINERAL-NUTRITION ; REVEGETATED AREA ; SURFACE CRUSTS ; TENGGER DESERT
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
EI主题词2019-11-01
来源机构Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/310709
作者单位Hebrew Univ Jerusalem, Inst Earth Sci, Givat Ram Campus, IL-91904 Jerusalem, Israel
推荐引用方式
GB/T 7714		 Kidron, Giora J.. The dual effect of sand-covered biocrusts on annual plants: Increasing cover but reducing individual plant biomass and fecundity[J]. Hebrew University of Jerusalem,2019,182.
APA Kidron, Giora J..(2019).The dual effect of sand-covered biocrusts on annual plants: Increasing cover but reducing individual plant biomass and fecundity.CATENA,182.
MLA Kidron, Giora J.."The dual effect of sand-covered biocrusts on annual plants: Increasing cover but reducing individual plant biomass and fecundity".CATENA 182(2019).
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