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以前的论文,根据田间调查①②和实验室模式试验②③,都强调过淹育水稻土还原层中非共生固氮(N_2)的重要性。在这些调查研究中已发现:施肥试验小区内的非共生固氮(N_2)活度高于没施肥的试验小区内的非共生固氮活度。现在,更进一步确定:水稻土中绝大部分土壤有机质是以有机碎屑形态存在④;有机碎屑的数量,在施肥试验小区高于没施肥的试验小区⑤;并且在有机碎屑上及其附近,土壤微生物活度是很高的。有机碎屑可能就是非共生固氮(N_2)的微场。根据这种假定设置的这种试验将在本文中叙述。
Previous papers emphasized the importance of non-symbiotic nitrogen fixation (N 2) in the submerged paddy soils according to field surveys ① ② and laboratory mode tests ② ③. In these surveys, it was found that non-symbiotic nitrogen fixation (N 2) activity in fertilization trial plots was higher than that of non-symbiotic nitrogen fixation in test plots without fertilization. Now, it is further determined that most of the soil organic matter in paddy soil exists in the form of organic debris ④; the amount of organic debris in the fertilization test plot is higher than that of the no-test plot ⑤; and in the case of organic debris Nearby, soil microbial activity is high. Organic debris may be non-symbiotic nitrogen fixation (N 2) of the micro-field. This test based on this assumption will be described in this article.