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Fruit dispersal dynamics of the cold desert shrub Zygophyllum xanthoxylon

Published online by Cambridge University Press:  11 October 2017

Xiaoying Zhao ,
Carol C. Baskin ,
Changqing Zhu  and
Jerry M. Baskin
Xiaoying Zhao*
Affiliation:
School of Life Science, Xinjiang Normal University, Urumqi, 830054, China
Carol C. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY 40546-0312, USA
Changqing Zhu
Affiliation:
School of Life Science, Xinjiang Normal University, Urumqi, 830054, China
Jerry M. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY 40506-0225, USA
*
*Correspondence Email: zzhaoxy@163.com
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Abstract

The pattern of seed dispersal in time and space can affect plant fitness and the soil seed bank, and thus information is needed on this aspect of the seed biology of a species before it is selected for use in habitat restoration projects. Zygophyllum xanthoxylon is a super-xerophilous shrub that is a potential pioneer species for use in revegetating highly disturbed areas of the cold deserts of northwest China. We studied fruit release and soil seed banks of Z. xanthoxylon for 3 years in two cold desert habitats characterized by different degrees of drought and wind velocity. In our study, fruit (a three-winged capsule) release began in summer (June 2010, August 2011, July 2012) and extended for 9–10 months, but plants can be found in the population with previous- and current-year fruits attached to them. More than 50% of the fruits were released in the first 3–4 months after maturity, while the others were released gradually over a 7–8 month period. The temporal pattern of fruit dispersal varied with habitat but not with amount of precipitation during summer. The pattern of fruit deposition on the soil surface was affected by neighbouring plants, wind velocity, wind direction and topography. In both habitats, >90% of the fruits were deposited beside large and small clusters of plants, mainly Ephedra przewalskii. To facilitate plant community development, we suggest that E. przewalskii should be planted (as a wind break) together with Z. xanthoxylon when native pioneer species are used for restoration of cold desert shrublands.

Keywords

Dabancheng region of Chinahabitat restorationseed dispersalshrublandssoil seed bankwind dispersal of seeds
Type
Research Papers
Information
Seed Science Research , Volume 27 , Issue 4 , December 2017 , pp. 303 - 310
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Copyright
Copyright © Cambridge University Press 2017 

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