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钼磷养分对福建红壤稻田生物固氮的影响

发表时间:2018-08-15  浏览量:184  下载量:39
全部作者: 毛盼盼,马红亮
作者单位: 福建师范大学地理科学学院,湿润亚热带山地生态国家重点实验室培育基地
摘 要: 土壤中的矿物养分会影响稻田生物固氮。为研究钼(Mo)磷(P)有效性对福建红壤稻田生物固氮的影响,试验选取泉州市永春县的水稻土壤为研究对象,设置对照(CT)、单独钼添加(LM,HM)、单独磷添加(LP,HP)、钼磷复合添加(LM+LP,LM+HP,HM+LP,HM+HP)这9种养分水平,培养一段时间后分别定期向土壤中添加碳、铁、氮,同时采用乙炔还原法(acetylene reduction assay,ARA),开展对不同钼磷梯度养分土壤的固氮酶活性研究。结果表明,在红壤水稻土中,含HM和LP的添加处理更有利于促进土壤中微生物固氮,较高的磷含量可能会限制生物固氮率。添加碳能促进CT、HP、LM+LP、LM+HP、HM+LP处理的乙烯生成,对CT土壤固氮酶活性的促进作用尤其明显,添加铁使得各处理土壤的生物固氮作用增强,添加氮有利于HM土壤的生物固氮。研究表明土壤养分差异是造成固氮酶活性变化的主要因素。
关 键 词: 土壤生态学;生物固氮;养分;钼磷限制;阴离子
Title: Effect of molybdenum and phosphorus nutrient on biological nitrogen fixation in Fujian red paddy soil
Author: MAO Panpan, MA Hongliang
Organization: State Key Laboratory of Subtropical Mountain Ecology (Funded by Ministry of Science and Technology and Fujian Province), College of Geographical Sciences, Fujian Normal University
Abstract: The mineral nutrients in the soil affect the nitrogen fixation in paddy soil. In order to study the effect of molybdenum (Mo) and phosphorus (P) on biological nitrogen fixation of red paddy soil in Fujian province, the rice soil in Yongchun county of Quanzhou city was selected as the study object. These nine treatments consisted of the control (CT), gradient separate Mo addition (LM, HM), gradient separate P addition (LP, HP) and gradient Mo and P composited (LM+LP, LM+HP, HM+LP, HM+HP). The experiment was carried out for a period of time, then C, Fe and N were added into the soil respectively. Meanwhile, the acetylene reduction assay (ARA) was used to study the activity of nitrogen-fixing enzymes in soil with different Mo-P gradient nutrients. The results showed that the addition treatment of HM and LP was beneficial to the promotion of micro-biological nitrogen fixation in the paddy soil, and higher P content might inhibit the nitrogen fixation rate. The addition of C could effectively promote the ethylene production in CT, HP, LM+LP, LM+HP, HM+LP treatments, especially CT soil. The addition of Fe stimulated the biological nitrogen fixation in each gradient soil. The addition of N was more favorable to the nitrogen fixation in HM soil. The research showed that the difference in soil nutrients was the main factor to change the activity of nitrogen-fixing enzymes.
Key words: soil ecology; biological nitrogen fixation; nutrient; molybdenum and phosphorus limitation; anion
发表期数: 2018年8月第15期
引用格式: 毛盼盼,马红亮. 钼磷养分对福建红壤稻田生物固氮的影响[J]. 中国科技论文在线精品论文,2018,11(15):1529-1536.
 
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