自然粒度酸化紫色土磷形态分级及其流失解析度评价

doi:10.11686/cyxb2017069

草业学报 ›› 2017, Vol. 26 ›› Issue (11): 22-34.DOI: 10.11686/cyxb2017069

自然粒度酸化紫色土磷形态分级及其流失解析度评价

张洋¹, 雷平^1,2, 谢德体¹, 倪九派^1,*

1.西南大学资源环境学院,重庆 400716;
2.绵阳师范学院,四川绵阳 621000

收稿日期:2017-03-01 修回日期:2017-05-05 出版日期:2017-11-20 发布日期:2017-11-20
通讯作者: *E-mail: nijiupai@163.com
作者简介:张洋(1988-),男,山东枣庄人,在读博士。E-mail:zhy2198@163.com
基金资助:
国家自然科学基金项目(41671291),中央高校基本科研业务费项目(XDJ2016E161)和重庆市研究生科研创新项目(CYB2015054)资助

Phosphorus fractionation and losses in an acidified purple soil

ZHANG Yang¹, LEI Ping^1,2, XIE De-Ti¹, NI Jiu-Pai^1,*

1.College of Resources and Environment, Southwestern University, Chongqing 400716, China;
2.Mianyang Normal College, Mianyang 621000, China

Received:2017-03-01 Revised:2017-05-05 Online:2017-11-20 Published:2017-11-20

摘要/Abstract

摘要： 土壤磷分级方法可用于土壤磷赋存形态转化的定量化研究及磷流失的解析度评价。为探讨施磷肥对酸化紫色土磷赋存形态及土壤磷流失解析度的影响,以酸化紫色土为研究对象,在榨菜生长区,设计3种磷肥处理(T₁,不施磷肥;T₂,常规施磷,60 kg P₂O₅/hm²;T₃,磷肥增倍,120 kg P₂O₅/hm²),采用一种新的磷形态分级法,开展不同磷肥处理下径流小区土壤磷赋存形态及其流失的解析度评价。结果表明,新分级方法对土壤磷形态的提取率与Hedley分级法无显著性差异,但其对磷流失指数具有更好的表征;磷流失指数与施肥量呈正相关,且NH₄F溶性磷和NaOH溶性磷对磷流失的解析度最强;增施磷肥(120 kg P₂O₅/hm²)显著提升土壤中游离态磷、树脂有效态磷、磷酸二钙型及磷酸八钙型等磷组分;不施磷肥显著降低磷酸二钙型、磷酸八钙型及铁(铝)结合态磷等磷形态。综上可知,自然粒度酸化土壤磷形态分级法具有可行性,其对面源污染磷流失定量化研究具有更好表征。同时,本研究证实土壤磷流失主要源于NH₄F溶性磷和NaOH溶性磷,且施肥显著影响活性磷库和慢性磷库中磷形态的转化。

Abstract: Phosphorus (P) fractionation was developed to quantitatively analyze P fraction transformation and P loss apportionment. In order to investigate the effect of P fertilization on P fractions and apportionment of P loss forms, a plot experiment with three P levels (0, 60 and 120 kg P₂O₅/ha) was conducted in a mustard crop grown on an acidified purple soil. Phosphorus fractions and P loss apportionment were analyzed using a new P fractionation method which is much less variable than the Hedley fractionation method and better at characterizing the P loss index. The P loss index was positively correlated with P fertilization and the main P loss source was soluble P in NH₄F and NaOH. Increasing P fertilization significantly increased the free P, resin available P, Ca₂-P and Ca₈-P, while zero P application significantly decreased the Ca₂-P, Ca₈-P and iron or aluminum bound P. In conclusion, the new P fractionation method was a viable and better method for characterizing the quantitative assessment of P loss in non-point source pollution. The study also showed that soil P loss was mainly of soluble P and that P fertilization greatly influenced the transformation of P fractions in a labile and chronic phosphorus pool.

张洋, 雷平, 谢德体, 倪九派. 自然粒度酸化紫色土磷形态分级及其流失解析度评价[J]. 草业学报, 2017, 26(11): 22-34.

ZHANG Yang, LEI Ping, XIE De-Ti, NI Jiu-Pai. Phosphorus fractionation and losses in an acidified purple soil[J]. Acta Prataculturae Sinica, 2017, 26(11): 22-34.

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自然粒度酸化紫色土磷形态分级及其流失解析度评价

Phosphorus fractionation and losses in an acidified purple soil

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