生态学报2017，Vol.37Issue(10)：3553-3560,8.DOI:10.5846/stxb201603170476
不同磷浓度植株残体降解对紫色土磷素有效性的影响
Effect of plant residue degradation on purple soil phosphorus availability
摘要
Abstract
Phosphorus (P) is essential for plant growth and crop production and quality.Much information is available on the effects of plant residue quality on rates of decomposition and N mineralization,but fewer studies have evaluated the relationship between residue quality and P release during decomposition.It has been suggested that plant residues may play an important role in this effect due to the P added to soil by residues.However,little is known about the changes in P pools during legume residue decomposition.Residues from Vicia faba L.and Brassica campestris L.with varying P concentrations were added to two kinds of soil with low available P concentration,and the concentration of various soil P pools were assessed by soil P fractionation on days 0,14,28,and 56.In this study,P speciation was determined using solution 31P nuclear magnetic resonance (NMR) spectroscopy to understand the potential fate of residue P in soils.The results showed that residue addition significantly increased cumulative respiration.The size of the P pools changed over time and was affected by both residue P concentration and soil type.For all plant samples,orthophosphate produced the most intense resonance in each spectrum and was the most abundant P species detected in shoot residue,which appeared to be related to their total P concentrations.For crop residues with higher total P concentrations,the greatest proportion was present as orthophosphate.More than 90％ of the phosphorus detected in the plant residue was found to be orthophosphate and phosphate monoester.However,increasing plant concentration of total P did not affect pyrophosphate concentration.Olsen-phosphorus was highest when the experiment began (day 0) but decreased as the experiment progressed.The increase in residual P found in all residues indicated that part of the mineralized P was converted into stable organic and inorganic P,which occurred mainly in the initial phase.These changes were generally more pronounced in high-and medium-P residues than in low-P residues.More Resin-P,NaHCO3-Pt,and cumulative respiration was detected in the acid purple soil than in the neutral purple soil,which may be attributed to the high Ca2+ concentration in the neutral purple soil.This study demonstrated that changes and transformations in soil P pools over time depend on residue P concentration and soil type,and that they have the potential to be delivered to soil in a form readily available to plants and soil microorganisms.关键词
植株残体/紫色土/正磷酸盐Key words
plant residue/purple soil/orthophosphate引用本文复制引用
郭涛,张思兰..不同磷浓度植株残体降解对紫色土磷素有效性的影响[J].生态学报,2017,37(10):3553-3560,8.基金项目
中央高校基本科研业务费专项(XDJK2010B012) （XDJK2010B012）
国家科技支撑计划项目(2012BAD05B03) （2012BAD05B03）
农业部公益性行业科研专项(201203030) （201203030）
