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題名 | Four-Year Monitoring of Thinning Effects on the Microclimate and Ground Vegetation in a Taiwania Plantation in the Liukuei Experimental Forest,Taiwan=六龜試驗林臺灣杉人工林疏伐四年後對微環境和地被植群影響之分析 |
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作者 | 汪大雄; 湯適謙; 劉景國; | 書刊名 | 臺灣林業科學 |
卷期 | 23:2 2008.06[民97.06] |
頁次 | 頁191-198 |
分類號 | 436.19 |
關鍵詞 | 微環境; 相對溼度; 地被植物; 覆蓋度; Microclimate; Relative humidity; Ground vegetation; Coverage rate; |
語文 | 英文(English) |
中文摘要 | 本研究探討不同疏伐策略對六龜試驗林台灣杉人工林疏伐四年後對立地微環境、林木生長、林分結構和地被植物之影響。調查結果顯示疏伐處理前各處理區間之光度日變化差異較小,但疏伐處理後強度疏伐區相對光度增加最多成為 17%,其次為中度疏伐區之 13%,但此等提升之能量卻在疏伐第二年後便快速減少,對照區因未處理,其相對光度逐年呈緩慢減弱;疏伐處理前後,林內與林外在全天大氣溫度之變化有顯著之差異,但林內全天大氣溫度之變化在各處理間均差異不顯著;相對濕度亦呈相同之現象。此外,地被植物顯示,由於疏伐區之疏伐作業會產生使前三種優勢種更呈優勢之現象,導致疏伐 4 年後各疏伐區之 Shannon 氏指數均較未疏伐前為低,顯示疏伐作業會降低地被中草本植物之歧異度。 |
英文摘要 | In this paper, we investigated 4-yr performance of the effects of the thinning strategies on the microclimate and ground vegetation development in a Taiwania cryptomerioides plantation in the Liukuei Experimental Forest in southern Taiwan. Thinning with 3 residual levels of basal area was carried out in 1999, and three 0.09-ha plots were set up to monitor each treatment. The results showed that in terms of microclimate, differences in the relative light intensity measured synchronously among treatments were small before thinning. The relative light intensity increased after the thinning operations, with the greatest increase for heavy thinning (17%) followed by medium thinning (13%). Differences among treatments immediately occurred after thinning, but dropped dramatically in the second year and gradually decreased afterwards. As to air temperature, 4 yr after thinning, differences between the open area and forest stands were highly significant during the daytime, but no significant difference was detected among treatments for the entire day. At the same time, a very significant difference existed in relative humidity between the open space and forest stands for the entire day, but no significant difference was found during the night among treatments. Finally, the ground vegetation surveys indicated an increase in the absolute coverage rate 4 yr after thinning for all treatments and a higher absolute coverage rate in the thinned plots. Moreover, the relative coverage rate showed the concentration on a few dominant species. Because the relative percentages of the first 3 dominant species in all thinned plots had increased 4 yr after thinning, this caused a decrease in Shannon’s diversity index value. |
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