Effects of repeated swine manure applications on legacy phosphorus and phosphomonoesterase activities in a paddy soil

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• 作者：Liang Li ; Xinqiang Liang ; Yushi Ye ; Yue Zhao…
• 关键词：Legacy ; P fractionation ; Labile P ; Moderately labile P ; Stable P ; Phosphomonoesterase activity
• 刊名：Biology and Fertility of Soils
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：51
• 期：2
• 页码：167-181
• 全文大小：672 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Agriculture
  Soil Science and Conservation
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0789

文摘

Swine manure application could affect soil legacy P and related transformation. Soil samples were taken for two rice seasons to uncover the responses of soil P fractions and phosphomonoesterase activities in a middle-term swine manure-applied rice field. The field experiment treatments included three swine manure organic amendment rates (26 [low], 39 [middle], and 52?kg?P?ha? [high]) and two controls (no fertilizer and 26?kg?P?ha? superphosphate). On seasonal average, the relative sizes of labile (H2O-P, NaHCO3-Pi, and NaHCO3-Po), moderately labile (NaOH-Pi and NaOH-Po), and stable (HCl-P and residual-P) P pools were in 1: 3.1: 3.6 and 1: 2.3: 3.7 ratios in 2011 and 2012, respectively. According to P fractions (except for residual-P) and phosphomonoesterase activities, treatments could be ranked as M52-?M39-?M26-?P26-?CK over the whole rice growth stages, but the difference between the 39 and 52?kg?P?ha? manure rates was not significant. Most of P fractions showed the highest content at rice seedling stage for all treatments while phosphomonoesterase activities reached their maximums at rice tillering stage for all treatments. Moreover, repeated swine manure did not affect most of P fractions (except for NaOH-Po) and phosphomonoesterase activities under the plow layer due to the mature plow pans. Our results suggest that the swine manure application should be kept at about 39?kg?P?ha? to decrease potential environmental risks and to maintain soil legacy P in the paddy soil.