Population size and specific potential of P-mineralizing and -solubilizing bacteria under long-term P-deficiency fertilization in a sandy loam soil

被引:63
作者
Hu, Junli
Lin, Xiangui [1 ]
Wang, Junhua
Chu, Haiyan
Yin, Rui
Zhang, Jiabao
机构
[1] Hongkong Baptist Univ, State Key Lab Soil & Sustainable Agr, Joint Open Lab Soil & Environm, Nanjing 210008, Jiangshu, Peoples R China
关键词
Arbuscular mycorrhizal colonization; Inorganic phosphate solubilizing bacteria; Organic phosphorus mineralizing bacteria; P-deficiency fertilization; Population size; Specific potential; ARBUSCULAR MYCORRHIZAL FUNGI; PHOSPHORUS FERTILIZATION; PHOSPHATE SOLUBILIZATION; GROWTH; MICROORGANISMS; COLONIZATION; COMMUNITIES; PROSPECTS; IMPACT; ROOTS;
D O I
10.1016/j.pedobi.2009.02.002
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
The effects of organic manure, mineral fertilizer (NPK), and P-deficiency fertilization (NK) on the individual biomass of young wheat plants, arbuscular mycorrhizal (AM) colonization in wheat root systems, population sizes of soil organic phosphorus mineralizing bacteria (OPMB) and inorganic phosphate solubilizing bacteria (IPSB) as well as soil P-mineralization and -solubilization potential. were investigated in a long-term (18-year) fertilizer experiment. The experiment included five treatments: organic manure, an equal mixture of organic manure and mineral fertilizer, fertilizer NPK, fertilizer NK, and the control (without fertilization). Plant biomass, population sizes of soil OPMB and IPSB were greatly increased (P<0.05) by the application of organic manure and slightly increased by the balanced application of mineral fertilizer, while undiminished AM colonization in wheat root system was only observed in the case of the NK treatment. Compared to balanced fertilization, P-deficiency fertilization resulted in a significant increase (P<0.05) of OPMB-specific mineralization potential (soil P-mineralization potential per OPMB cell.) and highest IPSB-specific solubilization potential. (soil P-solubilization potential per IPSB cell), suggesting that OPMB and IPSB are likely more metabolically active in P-deficiency fertilized soils after long-term fertilizer management, and mycorrhizal plants are more dependent on AM in P-poor soils than in P-fertilized soils. Our results also showed the different effects of mineral fertilizer versus organic manure on soil P-mineralization and -solubilization potentials, as well as specific potentials of OPMB and IPSB in arable soils. (C) 2009 Elsevier GmbH. All rights reserved.
引用
收藏
页码:49 / 58
页数:10
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