Arid
DOI10.1093/aob/mcx136
Fire timing in relation to masting: an important determinant of post-fire recruitment success for the obligate-seeding arid zone soft spinifex (Triodia pungens)
Wright, Boyd R.1,2,3; Fensham, Roderick J.4,5
通讯作者Wright, Boyd R.
来源期刊ANNALS OF BOTANY
ISSN0305-7364
EISSN1095-8290
出版年2018
卷号121期号:1页码:119-128
英文摘要

Background and Aims Plant species with fire-triggered germination are common in many fire-prone ecosystems. For such plants, fire timing in relation to the timing of reproduction may strongly influence post-fire population regeneration if: (a) flowering occurs infrequently (e.g. plants are mast seeders); and (b) seed survival rates are low and input from the current year’s flowering therefore contributes a large proportion of the viable dormant seedbank. The role of fire timing in relation to masting as a driver of post-fire recruitment has rarely been examined directly, so this study tested the hypothesis that fires shortly after masting trigger increased recruitment of the obligate-seeding arid zone spinifex, Triodia pungens R.Br., an iteroparous masting grass with smoke-cued germination.


Methods Phenological monitoring of T. pungens was conducted over 5 years, while a longitudinal seedbank study assessed the influence of seeding events on soil-stored seedbank dynamics. Concurrently, a fire experiment with randomized blocking was undertaken to test whether T. pungens hummocks burnt shortly after masting have greater post-fire recruitment than hummocks burnt when there has not been recent input of seeds.


Key Results Triodia pungens flowered in all years, though most flowerings were characterized by high rates of flower abortion. A mast flowering with high seed set in 2012 triggered approx. 200-fold increases in seedbank densities, and seedbank densities remained elevated for 24 months after this event. The fire experiment showed significantly higher recruitment around hummocks burnt 6 months after the 2012 mast event than a round hummocks that were burnt but prevented from masting by having inflorescences clipped.


Conclusions Fires shortly after masting trigger mass recruitment in T. pungens because such fires synchronize an appropriate germination cue (smoke) with periods when seedbank densities are elevated. Interactions between natural fire regimes, seedbank dynamics and fire management prescriptions must be considered carefully when managing fire-sensitive masting plants such as T. pungens.


英文关键词Arid vegetation obligate seeder seed predation spinifex grasslands synchronous flowering seedling establishment Triodia pungens
类型Article
语种英语
国家Australia
收录类别SCI-E
WOS记录号WOS:000423708500015
WOS关键词WESTERN-AUSTRALIA ; SOIL TEMPERATURES ; ACACIA-ANEURA ; DISPERSAL ; POACEAE ; DESERT ; PLANTS ; REPRODUCTION ; REGENERATION ; POLLINATION
WOS类目Plant Sciences
WOS研究方向Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/207555
作者单位1.Northern Terr Govt, Alice Springs Herbarium, Dept Land & Resource Management, Alice Springs, NT 0871, Australia;
2.Univ Queensland, Sch Agr & Food Sci, Brisbane, Qld 4072, Australia;
3.Univ New England, Sch Environm & Rural Sci, Bot, Armidale, NSW 2350, Australia;
4.Univ Queensland, Sch Biol Sci, Brisbane, Qld 4072, Australia;
5.Queensland Herbarium, Mt Coot Tha Rd, Brisbane, Qld 4066, Australia
推荐引用方式
GB/T 7714
Wright, Boyd R.,Fensham, Roderick J.. Fire timing in relation to masting: an important determinant of post-fire recruitment success for the obligate-seeding arid zone soft spinifex (Triodia pungens)[J],2018,121(1):119-128.
APA Wright, Boyd R.,&Fensham, Roderick J..(2018).Fire timing in relation to masting: an important determinant of post-fire recruitment success for the obligate-seeding arid zone soft spinifex (Triodia pungens).ANNALS OF BOTANY,121(1),119-128.
MLA Wright, Boyd R.,et al."Fire timing in relation to masting: an important determinant of post-fire recruitment success for the obligate-seeding arid zone soft spinifex (Triodia pungens)".ANNALS OF BOTANY 121.1(2018):119-128.
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