摘要
文章对水分胁迫的夏玉米光合生产力变化进行了系统观测和实验 ,研究表明 :①可将土壤持水量的 4 0 6 89%～ 5 5 79%和 79 99%作为叶片缺水及最适的外部形态指标 ;②干旱可以使株高低 2 2 5 6 %左右 ,而短时间内水分一直维持在田间持水量水平 ,对玉米的株高影响并不大 ;③比叶重随土壤湿度增加而增大 ,到田间持水量的 79 9%时达到最大值 ,随着湿度的进一步增加 ,比叶重反而略微变小 ;④叶片含水量与土壤湿度成正相关 ,吸收辐射率则受叶片湿度与厚度的影响 ,当土壤湿度达到持水量的 79 99%时 ,叶片吸收辐射率可达到 80 %左右。在此研究基础上 ,给出了包含浓度、辐射强度、温度及土壤水分因子的夏玉米叶片生产力计算公式 ,为进一步准确推算水分胁迫对区域生产力的可能影响 ,为当地政府开发农业气候资源提供了前提条件。
Water stress experiment is conducted during head sprouting period of summer maize in Huanghuaihai Plain of China. Results of the experiment indicate that the water content suitable for photosynthesis of summer maize is 77 0% of the moisture capacity, and the drought index is 49 3% of the moisture capacity. The indexes of the effects of water stress on leaf surface characters and plant height as well as on the leaf thickness are given synthetically in the paper. The radiation-photosynthesis curves under different soil moisture conditions are also presented, upon which a combined model,including environmental factors such as CO 2 concentration, solar radiation, temperature and soil humidity,is established. Validation of the model showed that it could simulate photosynthetic rate significantly and the coefficient of correlation could reach 0 86 with 206 samples. A great deal of observed data are given in this paper, which will provide basic parameters for calculating climatically productive potential of summer maize in Huanghuaihai Region.
出处
《资源科学》
CSSCI
CSCD
北大核心
2002年第1期51-54,共4页
Resources Science
基金
国家自然科学基金重大项目 (编号 :498992 70 )
中国科学院"百人计划"及中国气象科学研究院博士
博士后科研启动基金资助
