混植条件下における蒸発散量と乾物生産量の関係

日本作物学会紀事

岩下 瑞希¹  角 明夫¹  菅田 慎平¹ 

[1] 鹿児島大学農学部

关键词: Cowpea;    ササゲ;    Dry Matter Production;    乾物生産;    Evapotanspiration Maize;    トウモロコシ;    Mixed-cropping;    混植;    Symbiotic nitrogen fixation;    共生窒素固定;    Sunflower;    ヒマワリ;    Water use efficiency;    水利用効率;    蒸発散;   

DOI  :  10.1626/jcs.84.201

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Nitrogen (N) fixing plants have a lower water-use efficiency (WUE) than non-fixing plants. Although both types produce the same amount of mass upon drying, nitrogen-fixing plants were found to have consumed more water than non-fixing plants. We investigated whether this phenomenon could be detected in mixed planting. We measured WUE values of non-nitrogen-fixing maize and sunflower under single-species conditions and total dry weight (W) under mixed-species conditions. Then we calculated the sum transpiration amount (∑T, =W/WUE) and sum soil evaporation amount (∑E0). The sum of evaporation (∑ET) from a mixed pot containining non-nitrogen-fixing maize and sunflower species was consistent with the total of ∑T and ∑E0. On the other hand, the measured ∑ET from the mixed pot containing maize and nodulating cowpea was larger than the calculated ∑ET; this latter value was calculated by the procedure described above, using the WUE of maize and that of non-nodulating cowpea grown in a 5 gNO3-N pot-1. The difference between the values was closely related to nitrogen fixation. These results suggest that, if the WUE for non-nodulating plants can be estimated, a method for predicting the quantity of symbiotically-fixed nitrogen through measurements of ∑ET and W can be applied to mixed planting.

【 授权许可】

Unknown