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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。
The acetylene reduction method was used to determine the nitrogen fixation activity (5 A) of topsoil (5 cm) in Beijing paddy fields under light and dark conditions in situ during rice cultivation. The ARA indicated that in early July (tillering stage) and late August / September / September Period) had two peaks before and after the peak, the former peak is nitrogen fixation azotobacter and Azotobacter nitrogen fixation, while the latter peak is mainly cyanobacteria nitrogen fixation; paddy fields and recreational paddy topsoil, nitrogen fixation capacity during the whole growth period with different nitrogen fertilizer The level of nitrogen fixation could increase the nitrogen fixation activity of paddy soil and paddy soil, but its characteristics were different. Nitrogen fixation activity changes by the fertilization, inoculation of cyanobacteria and other factors.