| 几种作物的生理指标对土壤水分变动的阈值反应 |
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| 引用本文： | 张喜英,裴冬,由懋正.几种作物的生理指标对土壤水分变动的阈值反应[J].植物生态学报,2000,24(3):280-283. |
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| 作者姓名： | 张喜英 裴冬 由懋正 |
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| 作者单位： | 中国科学院石家庄农业现代化研究所!石家庄050021 |
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| 基金项目： | 国家自然科学基金，“九·五”国家科技攻关项目 |
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| 摘 要： | 在生长盛期，谷子、高梁、冬小麦的气孔导度、叶水势和光合速率在一定土壤含水量范围内并不随着土壤含水量的降低而发生明显变化，只有当土壤含水量低于一定程度时，才随着土壤湿度的降低而减少，表现为对土壤水分有明显的阈值反应。不同作物此阈值下限存在差异，高粱在大于田间持水量42％～45％的根层土壤湿度条件下，气孔阻力和叶水势基本维持恒定；谷子的这个指标在50％左右，冬小麦在60％左右。而夏玉米在所试土壤湿度范围内(20％～30％土壤体积含水量)，气孔阻力和叶水势基本维持不变，而光合作用随着土壤含水量的增高而出现增加趋势。表明在这4种作物中，只有玉米需要充足的水分供应才能维持其良好的生长发育，而高粱具有比其它3种作物更强的适应土壤水分变动能力，从而比其它作物更抗旱和耐旱。
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| 关 键 词： | 作物 光合 气孔导度 叶水势 土壤水分 |
| 修稿时间： | 1998-11-17 |
RESPONSE OF LEAF WATER POTENTIAL, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE TO VARYING SOIL MOISTURE IN FOUR CROPS: WINTER WHEAT, CORN, SORGHUM AND MILLET |
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| ZHANG Xi,Ying,PEI Dong and YOU Mao,Zheng.RESPONSE OF LEAF WATER POTENTIAL, PHOTOSYNTHESIS AND STOMATAL CONDUCTANCE TO VARYING SOIL MOISTURE IN FOUR CROPS: WINTER WHEAT, CORN, SORGHUM AND MILLET[J].Acta Phytoecologica Sinica,2000,24(3):280-283. |
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| Authors: | ZHANG Xi Ying PEI Dong and YOU Mao Zheng |
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| Abstract: | Results from measurements conducted between 1995 and 1998 at Luancheng Research Station showed that leaf water potential, photosynthesis and stomatal conductance of winter wheat, sorghum, millet were maintained in a relatively steady state with soil moisture above a threshold value. Below this critical level, the physiological factors decreased with decreasing of soil water content. Level of this threshold differed in three of the crop varieties studied: in sorghum the critical value was about 42%~45% soil water capacity, millet was at 50% and in winter wheat the threshold occurred at 60%. Summer corn was slightly different from the other three crops. While stomatal conductance and leaf water potential in this crop varied little across the range of 0.2 to 0.3 volumetric soil water content, photosynthesis increased with increasing soil water content in the same range. The results indicate that corn requires a relatively high water supply for growth and development, while sorghum had the highest drought resistant ability because of its adaptability to a wider range of soil water contents. |
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| Keywords: | Crops Photosynthesis Stomatal conductance Leaf water potential Soil water content |
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