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題 名 | Temperature and Soil Moisture Content Affect the Germination of Purple Nutsedge (Cyperus Rotundus L.) and Barnyardgrass [Echinochloacrus-Galli(L.) Beauv.]=溫度及土壤水分含量對香附子(Cyperus Rotundus L.)與稗草[Echinochloa Crus-Galli(L.)Beauv.]發芽之影響 |
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作 者 | 楊純明; | 書刊名 | 中華民國雜草學會會刊 |
卷 期 | 13:1 1992.02[民81.02] |
頁 次 | 頁1-7 |
分類號 | 433.58 |
關鍵詞 | 溫度; 土壤水分含量; 香附子; 稗草; |
語 文 | 英文(English) |
中文摘要 | 本文試驗旨在控制環境下探討溫度及土壤水分含量對香附子與稗草發芽之影響。 結果發現,香附子塊莖可在 20 至 35 ℃範圍內發芽,而以 25 至 30 ℃為最適當。溫度對 塊莖發芽效應受到土壤含水量之控制,當土壤含水量低於 60 %時,發芽率將逐漸下降。尤 其當溫度在 20 ℃以下或 35 ℃以上時,發芽率劇減。稗草種子之發芽亦同時受到溫度與水 分影響。在 20 ℃溫度下,稗草發芽率不受土壤水分含量之增減而改變;超此溫度,水分含 量大於 40 ℃將有助提高其發芽率。結果亦顯示,稗草種子發芽之適溫及土壤水分含量範圍 分別為 25 至 30 ℃及 60 %以上,其中又以 25 ℃及 60 %為最適條件。綜此結果,顯示 溫度及土壤水分為兩項重要影響香附子與稗草發芽之環境因子。而且以在濕潤土壤較乾燥土 壤為佳,香附子並比稗草能忍受較高溫度。又由測試的範圍發芽表現證實,此兩種雜草可以 在本省氣候狀況下之生長季節中持續地發芽。 |
英文摘要 | Experiments were conducted under controlled environment to determine the germination behaviors of purple nutsedge and barnyardgrass at defferent temperatures and soil moisture contents. Germination (sprouting) of tubers (basal bulbs) of purple nutsedge occurred form 20 to 35 ℃ but was optimal at 25 to 30 ℃. Temperature effect on the germination was influenced by soil moisture gradient. Germination progressively declined below the soil moisture content of 60%. Percent germination was strongly reduced at temperatures under 20 ℃ or above 35 ℃, especially below 60% moisture. Germination of barnyardgrass was also affected by both temperature and moisture. No significant difference of germination was acknowledged at 20 ℃ under the tested moisture contents. When temperature exceeded 20 ℃, moistures beyond 40% will in favor of germination. The appropriate ranges of temperature and moisture for barnyadgrass germination were from 25 to 30 ℃ and above 60%, respectively. The highest percentage was observed at 25 ℃ and 60% moisture. The results indicated that temperature and moisture are two important environmental factors affecting the germination of both weeds. This supports the fact that purple nutsedge and barnyardgrass can germinate throughout the growing season in the field in a climate such as Taiwan. Both weed species germinate better in wet than in dry soils, whereas purple nutsedge tolerates high temperature better than barnyardgrass. |
本系統中英文摘要資訊取自各篇刊載內容。