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农学学报 ›› 2020, Vol. 10 ›› Issue (1): 37-42.doi: 10.11923/j.issn.2095-4050.cjas18100017

• 土壤肥料 资源环境 生态 • 上一篇    下一篇

植物有效磷与水溶性磷对土壤磷素积累的响应研究

童文彬1, 邱志腾2, 章明奎2()   

  1. 1 衢江区土壤肥料技术推广站,浙江衢州 324022
    2 浙江大学环境与资源学院,杭州 310058
  • 收稿日期:2018-10-27 修回日期:2019-01-07 出版日期:2020-01-22 发布日期:2020-01-22
  • 通讯作者: 章明奎 E-mail:mkzhang@zju.edu.cn
  • 作者简介:童文彬,男,1966年出生,浙江龙游人,高级农艺师,本科,主要从事农技推广方面的研究。通信地址:324022 浙江省衢州市衢江区茶苑路15号 农业大楼衢江区土壤肥料技术推广站,E-mail:zjqztwb@163.com
  • 基金资助:
    国家自然科学基金面上项目“水耕人为土诊断层/诊断特性的空间分布规律与田间识别模式研究”(41571207)

Response of Bio-available Phosphorus and Water-soluble Phosphorus to Phosphorus Accumulation in Soil

Tong Wenbin1, Qiu Zhiteng2, Zhang Mingkui2()   

  1. 1 Qujiang Soil and Fertilizer Technology Extension Station, Quzhou, 324022, Zhejiang, China
    2 College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, Zhejiang, China
  • Received:2018-10-27 Revised:2019-01-07 Online:2020-01-22 Published:2020-01-22
  • Contact: Mingkui Zhang E-mail:mkzhang@zju.edu.cn

摘要:

以浙江省河谷平原、水网平原、滨海平原和丘陵山地等4类地貌的耕地为例,探讨了植物有效磷和水溶性磷随土壤磷素积累的变化特征。结果表明:植物有效磷和水溶性磷均随土壤磷素积累呈现明显的增加,它们随土壤磷素积累的增加量存在转变点。当土壤全磷达到0.80~0.95 g/kg以上时,植物有效磷随土壤磷素积累的增幅明显地增强;而当植物有效磷分别为42~62、165~265 mg/kg以上时,土壤水溶性磷水平发生了明显的2个递增过程。总体上,河谷平原土壤中植物有效磷和水溶性磷发生明显变化时土壤积累磷的临界值相对较低。由于易释放态磷占土壤磷的比例随磷积累的增加而增加,研究认为控制土壤磷素的过度积累可有效降低土壤磷素的流失。

关键词: 土壤磷素积累, 有效磷, 水溶性磷, 转变点

Abstract:

Taking cultivated land in four kinds of landforms in Zhejiang, including river valley plain, river network plain, coastal plain and hilly area, as the examples, the changing characteristics of bio-available phosphorus and water-soluble phosphorus with total phosphorus accumulation in soil were studied. The results showed that soil bio-available phosphorus and water-soluble phosphorus increased obviously with the increase of total phosphorus accumulation, there was a changing point in the increase. When soil total phosphorus reached 0.80-0.95 g/kg, the bio-available phosphorus increased significantly with the increase of soil total phosphorus accumulation. When the bio-available phosphorus was at 42-62 and 165-265 mg/kg, respectively, the soil water-soluble phosphorus level had two obvious increasing processes. Overall, the critical value of the accumulated total soil phosphorus was relatively low when soil bio-available and water-soluble phosphorus changed significantly in the valley plain. Since the proportion of readily available phosphorus in the total soil phosphorus increases with increasing phosphorus accumulation in soil, it is concluded that controlling the excessive accumulation of total phosphorus in soil could effectively reduce the loss of soil phosphorus.

Key words: Soil Phosphorus Accumulation, Available Phosphorus, Water-soluble Phosphorus, Changing point

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