Do Soil Chemical Changes Contribute to the Dominance of Blady Grass (Imperata cylindrica) in Surface Fire-Affected Forests?

被引:2
|
作者
Butler, Orpheus M. [1 ,2 ,3 ]
Lewis, Tom [4 ]
Chen, Chengrong [1 ,2 ]
机构
[1] Griffith Univ, Australian Rivers Inst, Nathan, Qld 4111, Australia
[2] Griffith Univ, Sch Environm & Sci, Nathan, Qld 4111, Australia
[3] Univ Sydney, Sch Life & Environm Sci, Camperdown, NSW 2050, Australia
[4] Univ Sunshine Coast, Dept Agr & Fisheries, Queensland Govt, Sippy Downs, Qld 4556, Australia
来源
FIRE-SWITZERLAND | 2021年 / 4卷 / 02期
基金
澳大利亚研究理事会;
关键词
burning; stoichiometry; nutrient limitation; phosphorus; nitrogen; alang-alang; cogongrass; fire weed; BURN AGRICULTURE JHUM; PHOSPHORUS; COGONGRASS; DISTURBANCE; NITROGEN; GROWTH; MANAGEMENT; BIOMASS; SLASH; STOICHIOMETRY;
D O I
10.3390/fire4020023
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Imperata cylindrica is a perennial grass that often proliferates in fire-affected forests. Recent fire events have been consistently associated with a lowering of soil nitrogen (N) to phosphorus (P) ratios. Thus, I. cylindrica might have a tendency toward P-limited growth and/or tolerance for low soil N availability that confers a competitive advantage post-fire. We contrasted soil and I. cylindrica chemistry between recently burned and unburned areas in eastern Australia. Imperata cylindrica foliar N:P ratios were 21% lower in burned areas than in unburned areas, reflecting an increase in the uptake of P, but not N, post-fire, consistent with P-limitation. We then grew I. cylindrica seedlings in soils with differing fire-exposure histories and subjected them to various resource amendments (including N and P addition). Survival of I. cylindrica seedlings was not affected by the fire-exposure history of soil, but was reduced by 66% through N-addition. Soil fire history did not significantly affect I. cylindrica growth, but addition of P greatly enhanced I. cylindrica growth, particularly on unburned soils. Our results indicate that the association between I. cylindrica and forest fire regime could be facilitated, in part, by the short-term positive effect of fire on soil phosphorus and the long-term positive effect of fire-exclusion on soil nitrogen, particularly on well-weathered soils.
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页数:18
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