科研之友
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摘要
The objective of this study was to evaluate the characteristics and intensity of Pinus taeda bark stripping by capuchin monkeys (Sapajus nigritus) by evaluating damage effects upon diameter and volume growth in a forestry plantation. A total of 169 plots, each containing 25 P taeda trees, were selected in a property of Celulose Irani, Santa Catarina State, Brazil. The distance between consecutive plots was 50 meters. Trees were grouped into size classes based on diameter at breast height (DBH). Evaluations were performed annually, when trees were from 5.5 to 10 old. The percentages of ringed and window-stripped trees at 5.5 years were 0.44% and 1.70%, and reached 35.6% and 29.0% at 10 years respectively. Bark stripping occurred in all diameter classes, though there was a preference for more vigorous trees. We compared damaged trees to undamaged trees to quantify the effects of capuchin monkey damage upon tree growth. In window-stripped trees, annual DBH growth was reduced 3.5% and 0.7% at 5.5 and 10 years respectively. In ringed trees, DBH growth was reduced 25.7%, and 4.2% at 5.5 and 10 years respectively. In window-stripped trees, volume reductions depreciated as trees aged with reductions of 7.0%, and 1.4% at 5.5 and 10 years respectively. This trend continued with ringed trees, as volume reductions were found to be 44.0% and 8.2% at 5.5 and 10 years respectively. As bark stripping was shown to have a strong negative impact on tree growth, we recommend that forest inventories include records of observed bark stripping, along with height of the lowest observed injury. Using this information it is possible to evaluate productivity losses, caused by bark stripping behavior of capuchin monkeys.
- 出版日期2015-3
