Restoration thinning permits stems to capitalize on high‐rainfall years in a regenerating endangered forest ecosystem. Issue 1 (21st January 2021)

• Record Type: Journal Article
• Authors: Towers, Isaac R.; Dwyer, John M.
• Is Part Of: Ecological solutions and evidence. Volume 2:Issue 1(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-01-21
• Subjects: Acacia harpophylla -- belah -- brigalow -- climate change -- hierarchical Bayesian models -- multi‐level -- neighbourhood -- woody regrowth; Environmental management -- Periodicals; Ecology -- Periodicals; Electronic journals; Periodicals; 333.72
• DOI: 10.1002/2688-8319.12043
• Languages: English
• ISSNs: 2688-8319

Abstract

Abstract: 1. Passively regenerating native vegetation presents a cost‐effective opportunity to sequester carbon and reinstate habitat in heavily cleared agricultural landscapes. 2. However, in some cases a few woody species recolonize in dense, low‐diversity stands that are slow to self‐thin. 3. Restoration thinning of over‐dominant species has been proposed to accelerate ecosystem recovery, but its longer term efficacy remains uncertain, and is likely to depend strongly on rainfall. 4. This study focuses on a restoration thinning experiment established in 2007 in dense brigalow ( Acacia harpophylla ) regrowth in Queensland, Australia. Using variation in rainfall between 2007 and 2017, we examined the interactive effects of neighbourhood density and moisture availability on the growth and survival of A. harpophylla . 5. We also compared the strength of A. harpophylla density effects on itself to its effects on a sparsely distributed co‐occurring tree species ( Casuarina cristata ) that was codominant in the original forest. 6. Our results provide clear evidence that thinning permits A. harpophylla to grow rapidly during periods of high rainfall, and that interspecific competition between A. harpophylla and C. cristata is relatively weak. As such, thinning of dense A. harpophylla could be combined with seeding or planting of co‐occurring tree species with complementary niches to further accelerate forest recovery in this extensive regrowth ecosystem. Abstract : This study focuses on survival and growth responses of brigalow ( Acacia harpophylla ) and belah ( Casuariana cristata ) ten years after a restoration thinning experiment in dense regrowth in the Brigalow Belt, Queensland, Australia. Our results provide clear evidence that thinning permits A. harpophylla to grow rapidly during periods of high rainfall and that interspecific competition between A. harpophylla and C. cristata is relatively weak. Thinning of dense A. harpophylla could be combined with seeding or planting of co‐occurring tree species with complementary niches to further accelerate forest recovery in this extensive regrowth ecosystem.