科尔沁沙地紫花苜蓿的光合日动态

应用生态学报

科尔沁沙地紫花苜蓿的光合日动态

徐丽君^1,2;王波³;孙启忠²

¹中国农业科学院研究生院, 北京 100081；²中国农业科学院草原研究所, 呼和浩特 010010；³北京林业大学水土保持学院, 北京 100083

收稿日期:2007-11-30 修回日期:1900-01-01 出版日期:2008-10-20 发布日期:2008-10-20

Diurnal dynamics of photosynthetic characteristics of alfalfa on Kerqin sandy land.

XU Li-jun^1,2; WANG Bo³; SUN Qi-zhong²

¹Graduate School of the Chinese Academy of Agriculture Sciences, Beijing 100081, China;²Grassland Research Institute, Chinese Academy of Agricultural Sciences, Hohhot 010010, China；³College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083,China

Received:2007-11-30 Revised:1900-01-01 Online:2008-10-20 Published:2008-10-20

摘要/Abstract

摘要： 利用Li-6400光合测定系统，田间实地测定了紫花苜蓿3个品种（敖汉苜蓿、Rangelander和阿尔冈金）的光合作用日变化特征.结果表明:不同生长年限紫花苜蓿3个品种的净光合速率(P_n)、蒸腾速率(T_r)和水分利用效率(WUE)日变化并不完全呈双峰曲线.其中，敖汉苜蓿和阿尔冈金叶片的P_n和T_r峰值均出现在9:00—11:00,Rangelander在11:00,最低值均出现在7:00和19:00；Rangelander和阿尔冈金叶片的WUE最高值出现在7:00,敖汉苜蓿在9:00,最低值均出现在15:00—17:00.综合分析P_n、T_r和WUE 3项指标,2 年生苜蓿各项指标最佳,1年生次之,而4年生最差；对P_n和T_r影响最大的环境因子是气温,其次是水分亏缺和空气相对湿度.

关键词: 黑龙江省, 旱涝时序特征, 标准化降水指数, 相对气象产量, 春大豆

Abstract: By using a Li-6400 portable photosynthesis system, the diurnal dynamics of the photosynthetic characteristics of three alfalfa varieties Medicago sativa L. cv. Aohan, M. sativa L. cv. Rangelander, and M. sativa L. cv. Algonquin were studied. The results showed that for the test alfalfa varieties, the diurnal variation curves of their P_n, T_r, and WUE were not all presented double-peak. For Aohan and Algonquin, the maximum P_n and T_r occurred at 9:00-11:00; while for Rangelander, they appeared at 11:00. The minimum P_n and T_r of the three varieties all appeared at 7:00 and 19:00. The maximum WUE of Rangelander and Algonquin appeared at 7:00 and that of Aohan was at 9:00, and the minimum WUE of the three varieties all appeared at 15:00-17:00. Comprehensive analysis on the photosynthetic performance indices P_n, T_r, and WUE indicated that 2 years old alfalfa was in the best state, followed by 1 year old, and 4 years old. Correlation analysis showed that air temperature (T_a) was the main environmental factor affecting P_n and T_r, followed by water vapor pressure deficit (VPD) and relative humidity (RH).

Key words: standardized precipitation index (SPI), spring soybean, time-series characteristics of drought and flood, Heilongjiang Province, relative meteorological yield

徐丽君^1,2;王波³;孙启忠². 科尔沁沙地紫花苜蓿的光合日动态[J]. 应用生态学报.

XU Li-jun^1,2; WANG Bo³; SUN Qi-zhong². Diurnal dynamics of photosynthetic characteristics of alfalfa on Kerqin sandy land.[J]. Chinese Journal of Applied Ecology.

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