快速評估溪頭柳杉人工林松鼠危害之嚴重程度與空間分佈

赤腹松鼠在溪頭柳杉人工林所造成的危害引起許多研究及管理上的關注，本研究將實地運用一套已建立之鼠害快速目測評估方法於溪頭營林區2林班49-1號柳杉純林造林地上，以了解此方法是否適用於評估鼠害之空間分佈與嚴重程度。鼠害快速評估結果顯示，此區鼠害木百分比高達80.98%（±7.65%）。另外，樣木遭受鼠害的比率由造林地西南方往東北方遞增，若以樹冠顏色來判斷鼠害，顯示鼠害發生的走向可能由造林地西南方往東北方移動。受鼠害影響程度以造林地中間部分較嚴重而且具有高比例的鼠害分岔，顯示樣木重複受害之比率最高及鼠害規模較大。鼠害分岔之高度有由南往北及由西往東增加之趨勢，從木材利用的角度來看，造林地西南部的可用材少於造林地東北部。從而得知，使用鼠害快速目測評估方法能展示鼠害分佈之情形，有利於林分管理以及規劃育林作業。

關鍵字

赤腹松鼠；鼠害空間分佈；鼠害目測快速評估方法；人工林；林分健康

並列摘要

For many years, red-bellied tree squirrel has caused significant damage to Cryptomeria japonica plantations at Xitou Nature Education Area such that it has raised serious concerns among researchers and managers. This research aimed at applying a published rapid assessment mechanism to visually assess squirrel damage among the C. japonica trees in a pure species planted stand at Xitou to understand whether the mechanism could assess damage severity and map its spatial distribution. The rapid assessment found that 80.98% (± 7.65%) of trees were affected by squirrel with the severity increasing from Southwest to Northeast. When using coloration at tree crown as an indicator, squirrel damage appeared to move from Southwest to Northeast as well. The middle section of the stand received the most severe damage and the highest number of forking suggested repeated damage by squirrel. Tree height to fork increased from South to North and from West to East suggesting less amount of merchantable wood on the Southwest section of the stand than the Northeast section. As a result, this study presents the applicability of the rapid assessment mechanism to spatially observe squirrel damage, which could benefit stand management and silvicultural treatment design.

並列關鍵字

Red-bellied tree squirrel ； Spatial distribution of squirrel damage ； Rapid assessment ； Plantation ； Stand health

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快速評估溪頭柳杉人工林松鼠危害之嚴重程度與空間分佈

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