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| 低分子量有机酸对不同肥力土壤磷素的活化作用 | |
| 引用本文： | 杨绍琼,党廷辉,戚瑞生,马瑞萍.低分子量有机酸对不同肥力土壤磷素的活化作用[J].干旱地区农业研究,2012,30(4):60-64. |
| 作者姓名： | 杨绍琼 党廷辉 戚瑞生 马瑞萍 |
| 作者单位： | 1. 中国科学院水利部水土保持研究所,陕西杨凌,712100 2. 中国科学院水利部水土保持研究所,陕西杨凌712100;西北农林科技大学资源环境学院,陕西杨凌712100 3. 西北农林科技大学资源环境学院,陕西杨凌,712100 |
| 基金项目： | 国家重点基础研究发展计划 |
| 摘 要： | 针对石灰性土壤磷素固定累积问题,采用化学浸提方法,探讨低分子有机酸对不同肥力水平土壤磷素的活化作用,提高磷素的有效性.结果表明,对于低肥力和中肥力土壤,相同浓度下有机酸活化土壤磷的能力表现为草酸＞柠檬酸＞苹果酸；对于高肥力土壤,相同浓度下有机酸活化土壤磷的能力为柠檬酸＞草酸＞苹果酸.低浓度对有机骏对土壤磷的活化有抑制作... |
| 关 键 词： | 低分子量有机酸 土壤肥力 磷素 活化作用 |
Activation of organic acids on phosphorus of soil with different fertility |
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| YANG Shaoqiong,DANG Tinghui,QI Ruisheng,MA Ruiping.Activation of organic acids on phosphorus of soil with different fertility[J].Agricultural Research in the Arid Areas,2012,30(4):60-64. | |
| Authors: | YANG Shaoqiong DANG Tinghui QI Ruisheng MA Ruiping |
| Institution: | 1.Institute of Soil and Water Conservation,CAS & MWR,Yangling,Shaanxi 712100;2.College of Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China) |
| Abstract: | To solve the problem of soil phosphorus accumulation and fixation in calcareous soil,extraction experiments were conducted to investigate the effect of organic acids with low molecular weight(LMW) on phosphorus activity in different fertile calcareous soils.The results showed that the organic acids could significantly stimulate the mobilization of soil phosphorus in all three soils tested.When in the same concentration,the three organic acids followed an order of oxalic acid>citric acid>malic acid in the capability of activating soil phosphorus in the low fertility and moderate fertility soil;In the high fertility soil,the three followed the order of citric acid>oxalic acid>malic acid.Low concentration of organic acids(≤2 mmol/L) could significantly restrained soil phosphorus activity in low and moderate fertility soil,especially for the malic acid.LMW organic acids could decline the pH of soil extract significantly,and the citric acid showed the strongest declining capacity. Meanwhile,for the same kind of organic acid,the extent of phosphorus activating decreased with the increasing of soil pH. |
| Keywords: | organic acids with low molecular weight soil fertility activation of phosphorus |
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