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惠蓀林場香杉人工林之森林健康評估

Assessment of forest health for a Luanta-fir (Cunninghamia lanceolata var. konishii) plantation in Huisun Forest Experimental Station

摘要


本研究旨在探討惠蓀林場香杉人工林健康之評估,全林依據吊床設施之設置,可分為吊床區(Hammock Area, HA)與非吊床區(Non-Hammock Area, NHA),其中吊床區中又依林木是否設置吊床可再細分為吊床木(Hammock Tree, HT)與非吊床木(Non-Hammock Tree, NHT)。本研究為掌握全林之健康情況,採每木調查法,係以單木進行林木健康度之評估;並根據上述林木區分為吊床區-吊床木(HA-HT)、吊床區-非吊床木(HA-NHT)及非吊床區林木(Tree in Non-Hammock Area , TNHA)。全林共計481株林木,與上述三類之林木株數依序分別為43株、350株及88株,本研究以上類別進行ANOVA分析,結果顯示不同類別林木之健康程度達顯著差異(F=8.947, P<0.001),經LSD事後檢定,以HA-HT(28.16±5.90)健康分數最差;TNHA (32.48±4.93)最為健康;HA-NHT (30.74±5.63)則介於二者之間;然而林木在7項指標的健康分數表現,以根部狀態指標在此三類林木之差異最為明顯,本研究推測此係因遊客進入吊床區內,人類活動所產生踩踏行為致使土壤緊實且產生林地裸露現象,林地缺乏植被覆蓋容易造成土壤沖蝕導致林木根部外露,此現象在設有吊床之林木尤為明顯。因此,本區域中吊床設施的設置可能為影響林木健康情形主要的因子之一。本研究所得之結果期能瞭解惠蓀林場香杉人工林之森林健康現況,以作為後續森林生態系優劣評估的重要依據,供森林經營管理之參考。

並列摘要


The purpose of this research was to assess forest health for a Luanta-fir (Cunninghamia lanceolata var. konishii) plantation in the Huisun Forest Experimental Station Area. The study site was divided into two areas, the Hammock Area (HA) and the Non-Hammock Area (NHA). Trees in the HA can be further classified into hammock trees (HA-HT) and non-hammock trees (HA-NHT). Trees in the NHA were composed of single tree type, namely tree in non-hammock area (TNHA). The tree health conditions were assessed among HA-HT, HA-NHT and TNHA based on tree health indicators. A total of 481 trees were accessed, with HA-HT, HA-NHT and TNHA contained 43, 350 and 88 trees, respectively. The ANOVA results showed that the scores of tree health significantly differed among HA-HT, HA-NHT and TNHA (F=8.947, P<0.001). LSD test showed TNHA (32.48±4.93) had the best heath condition, followed by HA-NHT (30.74±5.63) and HA-HT (28.16±5.90). The root of trees in the hammock area were bared and injured. Thus, HA-NHT and HA-HT had lower scores in root indicator, with HA-HT had the lowest score. We inferred that the low health score in of trees in the HA was due to the impact of human activities. These findings provide fundamental information of assessment and management of the forest ecosystem.

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