Effects of landscape heterogeneity and clearfell harvest size on beetle (Coleoptera) biodiversity in plantation forests

摘要: Compared to natural forests, fast-growing plantations of exotic species such as Pinus radiata are often perceived marginal habitat or unsuitable for most native species. By studying Coleoptera (beetles) in a variety landscape elements (pasture, forest and different aged stands) highly modified fragmented New Zealand I aimed determine the value plantation forests biodiversity, how these affected by sized clearfell harvest areas. Pitfall trap sampling beetles showed that stands can provide suitable complimentary many Rarefied richness Carabidae, Scarabaeidae Scolytinae was not significantly between habitats, however, types differed their beetle community composition. Comparing production had composition similar forest. However, small minority species, e.g., Dichrochile maura, were restricted highlighting importance retaining indigenous ecosystems within plantations. Unlike human did Clearfell harvesting is controversial its impact on biodiversity key constraint certification programs, administered Forest Stewardship Council (FSC). Despite this, no replicated manipulative experimental studies areas have been undertaken at scales relevant industry. One potential model sizes concept threshold size. A scenario may occur where impacts increase rate disproportionate change size over range areas, but remain relatively unchanged either side zone. sampled experimentally created 0.01, 0.05, 0.5, 5.0, 50 500 ha clearfells central North Island Zealand. The wide sizes, including some very 0.01 instigated an attempt document thresholds. higher compared adjacent mature stands. 5 greater than – 0.5 Although, high