|
|
|
한국자원식물학회 / v.1, no.1, 1998년, pp.43-48 
|
( Effects of Elevated $CO_2$ and Temperature on Competition between Rice and Echinochloa glabrescens Seedlings ) |
| ; ;
|
|
|
 |
|
| |
| 초 록 |
|
|
| The objective of this study was to determine how elevated $CO_2$ and temperature affected early growth and competition between direct seeded rice (Oryza sativa) and a common paddy weed (Echinochloa glabrascens). By using temperature gradient chambers. Rice and E. glabrescens were grown for 5 weeks at ratios of 1:0. 3:1 and 0:1 at three temperatures ($16.4^{circ}C,;19.8^{circ}C,;and;22.2^{circ}C$) and either in ambient (361ppm) or elevated (566ppm) $CO_2$. For both species. elevated $CO_2$ had no effect on mainstem leaf number while air temperature had a slight positive effect which was greater in E. glabrescens than rice. With elevated $CO_2$ rice leaf area index and plant height increased alightly in all species combinations but no increases were observed for E. Glabuescens. For rice in all combinations. elevated $CO_2$ tended to increase the rot and total biomass much more than any other growth parameters: the increases in root and total biomass resulting from elevated $CO_2$ ranged from 16% to 40%. depending on air temperature. At the lowest temperature, the decrease in rice biomass in combination with E. glabrescens was significantly greater at elevated $CO_2$ (18%) than ambient $CO_2$ (3%). At the highest temperature, however, the decrease in rice biomass at elevated $CO_2$ (22%) was less than that at ambient $CO_2$ (36%). The competitive ability of rice as measured by the decrease in biomass when grown in combination with E. glabrescens depended strongly on root growth and/or allocation. These results suggest that at higher temperatures elevated $CO_2$ could enhance the competitive ability of direct seeded rice during early growth. However, at lower temperatures. the competitive ability of E. glabrescens seems to be greater. |
| |
| 키워드 |
| competiton;direct seeded rice;Echinochloa glabrescens;elevated $CO_2$;early growth; |
| |
|
|
|
|
Plant Resources / v.1, no.1, 1998년, pp.43-48
한국자원식물학회
ISSN : 1226-8771
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199811920279500)
언어 : 영어 |
|
| 논문 제공 : KISTI 한국과학기술정보연구원 |
|
|
|
|
|
|
