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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Simultaneous effects of reintroduction strategy and seed size on the initial development of two tropical tree species in an abandoned eucalyptus plantation

Julie Christine Scaloppi A and Andréa Lúcia Teixeira de Souza https://orcid.org/0000-0002-8715-0591 B C
+ Author Affiliations
- Author Affiliations

A Graduate Program in Environmental Sciences, Federal University of São Carlos, São Carlos, SP, Brazil.

B Department of Environmental Sciences (DCAm), Federal University of São Carlos, São Carlos, SP, 13565-905, Brazil.

C Corresponding author. Email: altdesouza@gmail.com

Australian Journal of Botany 68(6) 439-448 https://doi.org/10.1071/BT20093
Submitted: 31 July 2020  Accepted: 23 September 2020   Published: 19 October 2020

Abstract

Seedling planting is the most common strategy used to reintroduce tropical native tree species; however, direct sowing has simplicity and operational ease advantages. Functional traits such as seed size and growth rates have been shown to be relevant for better plant performance. We evaluated the effects of intraspecific variation in seed size and the reintroduction strategy simultaneously on the development of Hymenaea courbaril (L.) and Enterolobium timbouva (Mart.) introduced in an abandoned eucalyptus plantation over 462 days. Plants from small, medium and large seeds were reintroduced by planting seedlings and direct seeding. Both species achieved high rates of emergence and survival was high in the two reintroduction strategies. Seed size was not related to emergence and mean time to emergence for either species. The survival of both species was higher than 74% in the field, and seed size had little effect on survival rates. In general, H. courbaril plants introduced by direct sowing had higher growth, and seed size correlated positively with stem size. In contrast, the growth of E. timbouva plants introduced by seedling planting was higher than in plants introduced by direct sowing regardless of seed size. The light requirements of this species seem higher than for H. courbaril. Our results suggest the feasibility of reintroducing species by direct sowing in eucalyptus understory, but since plant growth varies between species, there may be a balance between the advantage of the initial plant size provided by planting seedlings and the advantage of a better root development provided by direct sowing.

Keywords: direct seeding, emergence, Enterolobium timbouva, Hymenaea courbaril, intraspecific variation, initial stem size, intraspecific variation, reintroduction strategies, seed size, seedling planting.


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