| 摘要: |
| 花铃期土壤相对含水量在60％以下时,棉花主茎平均日生长量和果节出现速率比不缺水的对照降低30％以上;土壤水分低于40％时,生长基本停止。随土壤缺水程度加剧,棉叶的光合速率(Pr)、水势(ψ1)和蒸腾强度(Tr)呈直线下降,气孔阻力(rs)呈指数曲线型增加。此期土壤水分适宜时,棉株的Pr为22.0mg千重/dm2·h,ψ1在-15巴以上,Tr约9.4μg/cm2·s,rs约2.3s/cm;严重缺水时,Pr、ψ1和Tr均降低50～53％,rs增加约54％。 |
| 关键词: 棉花,花铃期,土壤水分,生长发育,生理特性 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目 |
|
| THE EFFECTS OF WATER DEFICIT ON THE DEVELOPMENT AND PHYSIOLOGICAL CHARACTERS OF COTTON DURING FLOWERING AND BOLL SETTING |
|
.Zhao Duli Xu Yuzhang Xu Xuan "rang Zhcnyi,.Zhao Duli Xu Yuzhang Xu Xuan "rang Zhcnyi,.Zhao Duli Xu Yuzhang Xu Xuan "rang Zhcnyi
|
| Abstract: |
| It was observed that the rates of main stem growth and fruiting site formation
decreased by over 30% when soil relative water content (SRWC) was lower than
60% as against control plants,growth virtually ceased when SRWC fell below
40%.There were linear decreases in the photosynthetic rate(Pr),water
potontial (ψ1) and transpiration rate (Tr) of cotton leaves and exponenlia
curve increases in stomatal resistance〔rs) as soil moisture deficit increased.
when soil moisture ws suitable during this period,the average Pr was 22.0
mg DW/dm2.h1,ψ1 above-15 bar,Tr about 9.4 μg/cm2.s,rs about
2.3 S/cm;Pr,ψ1 and Tr all decreased by 50一53% and rs increased by about
54% under severe water deficit. |
| Key words: cotton,soil water during flowering and boll setting,growth and development,physiological characters |
