| 摘要: |
| 在水稻栽培期间应用乙炔还原法,原位测定光照和黑暗培养条件下的北京水稻田表层土壤(5cm)的固氮活性(ARA 表示)表明:在7月初(分蘖期)和8月底9月初(抽穗期)有前、后期两次高峰,前期峰是固氮蓝藻和固氮菌共同固氮,而后期峰主要是蓝藻固氮;稻田与休闲水田的表层土壤,在全生育期内固氮能力的大小随不同施氮肥水平而异;接种固氮蓝藻能使稻田与休闲水田表层土壤的固氮活性提高,但其特点不同。茎基的固氮活性变化受施肥、接种蓝藻等因素影响。 |
| 关键词: 稻田土壤 水稻茎基 固氮活性 |
| DOI： |
| 投稿时间：1994-10-20 |
| 基金项目:国家自然科学基金 |
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| Abstract: |
| The nitrogen fixation activity of surface soil layer (0~5 cm)in paddy field of Beijing was measured by acetylene reduction method in light and darkness. It showed that the Nz-fixing activity of sur- face soil layer presented two peaks in the rice growth season. One at tillering stage, It was due to the Nz- fixing action of bluegreen algae and bacteria ~ another at heading stage, due to the result of Nz-fixing of al- gae principaly.The N_2-fixing capacity of surface soil layer and submerged stalk in planted ... |
| Key words: surface soil layer submerged stalk Nitrogen-fixing activity |
