- 期刊
杉木造林地疏伐對鳥類群聚及刺鼠族群之影響
Effects of Thinning on Bird Community and Spinous Country-Rat (Niviventer Coxingi) Population in China-Fir (Cunninghamia Lanceolata) Plantations
摘要
We studied the effects of low-intensity thinning (27%) of a 20 year-old China-fir (Cunninghawia lanceolata) plantation on local bird and Spinous country-rat (Niviventer coxingi) in the Nay-Mau-Pu tract at National Taiwan University Experimental Forest, Nantou County, Taiwan. We invested the species composition, abundance, and diversity of bird and small mammal communities at an thinning site and an unthinning site before and after thinning from Nov. 1998-Mar. 2000. Thirty-six species of birds were recorded at the thinning site whereas 29 were recorded at the unthinning site; 28 species were common at both sites. At the thinning site, the bird density one month after thinning was significantly lower than pre-thinning, while no difference was found between pre-thinning, and four, seven, and ten months after thinning. At the unthinning site, the bird density did not change significantly over time. Red-headed babbler (Stachyris ruficeps), Vinous-throated Parrotbill (Paradoxornis webbianus) and White-throated Flycatcher-warbler (Abroscopus albogularis) were significantly more abundant after thinning (p＜0.05) at thinning site. The understory-gleaner guild was significantly higher after thinning. Based on the community similarity analysis, the bird community structure seven months after thinning was similar to pre-thinning (78%). Of the four mammal species lived-trapped at the sites during the study, the Spinous country-rat was the most abundant species and its data were analyzed further. The monthly mean population size of the Spinous country-rat after thinning was not significantly different than pre-thinning (9.5±0.71 vs. 11.1±4.7 individuals/ha, t=-4.057, p=0.656). However, seven months after thinning the population bounced back (to a plateau of 11 individuals). Results of this study suggest that low-intensity thinning has instant effects on local bird and mammal communities, but after four to five months, the effects of thinning on birds and small mammal communities were alleviated.
並列摘要
We studied the effects of low-intensity thinning (27%) of a 20 year-old China-fir (Cunninghawia lanceolata) plantation on local bird and Spinous country-rat (Niviventer coxingi) in the Nay-Mau-Pu tract at National Taiwan University Experimental Forest, Nantou County, Taiwan. We invested the species composition, abundance, and diversity of bird and small mammal communities at an thinning site and an unthinning site before and after thinning from Nov. 1998-Mar. 2000. Thirty-six species of birds were recorded at the thinning site whereas 29 were recorded at the unthinning site; 28 species were common at both sites. At the thinning site, the bird density one month after thinning was significantly lower than pre-thinning, while no difference was found between pre-thinning, and four, seven, and ten months after thinning. At the unthinning site, the bird density did not change significantly over time. Red-headed babbler (Stachyris ruficeps), Vinous-throated Parrotbill (Paradoxornis webbianus) and White-throated Flycatcher-warbler (Abroscopus albogularis) were significantly more abundant after thinning (p＜0.05) at thinning site. The understory-gleaner guild was significantly higher after thinning. Based on the community similarity analysis, the bird community structure seven months after thinning was similar to pre-thinning (78%). Of the four mammal species lived-trapped at the sites during the study, the Spinous country-rat was the most abundant species and its data were analyzed further. The monthly mean population size of the Spinous country-rat after thinning was not significantly different than pre-thinning (9.5±0.71 vs. 11.1±4.7 individuals/ha, t=-4.057, p=0.656). However, seven months after thinning the population bounced back (to a plateau of 11 individuals). Results of this study suggest that low-intensity thinning has instant effects on local bird and mammal communities, but after four to five months, the effects of thinning on birds and small mammal communities were alleviated.