不同磷浓度植株残体降解对紫色土磷素有效性的影响

发布时间：2018-05-27 03:22

本文选题：植株残体 + 紫色土　；参考：《生态学报》2017年10期

【摘要】：植株残体降解可直接或间接地影响土壤磷素的有效性,为探讨不同磷浓度植株残体降解对紫色土磷分级体系的影响,结合31P核磁共振分析技术,选取了3种磷浓度不同的植物残体与两种紫色土进行室内模拟培养试验,得出了以下研究结论:(1)添加植株残体显著增强了紫色土呼吸强度,且紫色土分级体系中的活性磷含量均高于对照处理(2)31P-NMR分析结果得知,植株残体的正磷酸盐、磷酸单酯占浓缩液全磷比例的90%以上,高磷植株的正磷酸盐和磷酸单酯含量显著高于中磷和低磷植株,土壤磷素有效性的变化与植株残体的正磷酸盐和磷酸单酯含量有关;(3)紫色土分级体系中的活性磷在0 d含量最高,随着培养周期的延长,土壤磷素有效性会出现降低的趋势;酸性紫色土的累积呼吸强度、分级体系中活性磷(Resin-P、Na HCO3-Pt)所占比例均高于中性紫色土,与土壤钙含量有关。综上所述,植株残体的磷浓度越高,更有利于提高土壤磷素的有效性,本研究结果为农业生产中秸秆还田技术提供了理论参考。
[Abstract]:The degradation of plant residues can directly or indirectly affect the availability of soil phosphorus. In order to study the effects of plant residues degradation on the phosphorus classification system of purple soil with different phosphorus concentrations, 31P nuclear magnetic resonance analysis was used. Three plant residues with different phosphorus concentrations and two purple soils were selected for indoor simulated cultivation. The following conclusions were obtained: 1) addition of plant residues significantly increased the respiration intensity of purple soil. The results of 31P-NMR analysis showed that orthophosphate, phosphate monoester accounted for more than 90% of the total phosphorus in the concentrated solution of the plant residue, and the content of active phosphorus in the purple soil classification system was higher than that in the control treatment. The contents of orthophosphate and phosphate monoester in high phosphorus plants were significantly higher than those in medium and low phosphorus plants. The change of soil phosphorus availability was related to the content of orthophosphate and monoester of plant residues.) the content of active phosphorus in purple soil was the highest in 0 d. With the extension of culture period, the availability of soil phosphorus decreased. The cumulative respiration rate of acid purple soil and the percentage of active phosphorus in the classification system were higher than those in neutral purple soil, which was related to the soil calcium content. To sum up, the higher the phosphorus concentration of plant residues, the more beneficial to improve the availability of soil phosphorus. The results of this study provide a theoretical reference for the technology of straw returning to the field in agricultural production.
【作者单位】：西南大学资源环境学院;国家紫色土土壤肥力与肥料效益监测基地;
【基金】：中央高校基本科研业务费专项(XDJK2010B012) 国家科技支撑计划项目(2012BAD05B03) 农业部公益性行业科研专项(201203030)
【分类号】：S141.4;S153.6

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