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題名 | Effect of Soil Water Status on the Physioecological Traits and the Ecological Replacement of Two Endangered Species, Changium Smyrnioides and Chuanminshen Violaceum=土壤水分狀況對兩瀕危種明黨參和川明參生理生態的影響及其生態替代 |
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作者姓名(中文) | 葛瀅; 常傑; 傅承新; 陳玉成; | 書刊名 | Botanical Bulletin of Academia Sinica |
卷期 | 44:4 2003.10[民92.10] |
頁次 | 頁291-296 |
分類號 | 414.34 |
關鍵詞 | 生態替代; 瀕危種; 生長; 形態; 光合; 亞熱帶; 蒸騰; 水分利用效率; Ecological replacement; Endangered species; Growth; Morphology; Photosynthesis; Subtropical zone; Transpiration; Water use efficiency; |
語文 | 英文(English) |
中文摘要 | 傘型科的明黨參 (Chongium smyrnioides Wolff)和川明參 (Chuanminshen violaceum Shen et Shan) 都只限於分佈在中國的長江流域,分佈範圍很窄。明黨參分佈在亞熱帶東部到中部, 川明參則只分佈在中部至西部,在中部幾乎重疊。由於兩植物分佈區的氣候從濕潤到半濕潤過渡,我們設計實驗查明其對土壤水分的要求,並通過其生理生態特徵和結構特徵對土壤水分的回應分析其生態位分離。實驗結果表明,兩種植物有相似的結構特徵和功能強度;但兩個種光合、蒸騰和水分利用效率在3種土壤水分條件下的日變化、日平均及其與光強和溫度的關係表明川明參比明黨參更耐乾旱。形態學特徵也顯示明黨參適於中等到濕潤的土壤環境, 而川明參適應於較乾旱的土壞環境。生理和形態特徵對土壤水分環境適應性的差異應是 兩植物成為地理替代種的部分原因。實驗結果表明,這兩種植物在保護的機理和途徑上應該是相似的。 |
英文摘要 | Both Changium smyrnioides Wolff and Chuanminshen violaceum Shen et Shan are monotypic species of the family Umbellaceae. They have narrow distribution areas and can only be found in the Yangtze River basin in China. Changium is distributed from the east to middle subtropical zone of China, and Chuanminshen from the middle to the west; they almost meet in the middle of the Yangtze basin. Because the climate varies from humid to semi-humid, an experiment was carried out to find out the two species' demand for soil water and analyze their niche separation by determining changes in their physio-ecological and structural traits in response to different soil water statuses. Results showed that the two species have similar structural characters and functional intensity. Diurnal variations, daily mean values, and relationships of irradiation and temperature to PN, E and WUE among the three treatments indicate that Chuanminshen has more tolerance to drought than Changium. Changes in morphological traits also suggest that Changium adapts to medium to wet soil conditions while Chuanminshen adapts to drought soil conditions. The differences in the adaptation of physiological and morphological traits to the water environment should be part of the reason these two species have become geographically vicarious species. The results indicate that, at least, the mechanism and the approach to conservation for the two species are similar. |
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