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草业学报 ›› 2025, Vol. 34 ›› Issue (7): 69-82.DOI: 10.11686/cyxb2024307

• 研究论文 • 上一篇    下一篇

铵态氮肥施用量对不同类型紫色土氮淋失及表面电化学性质的影响

陈薪宇(), 邓正昕, 王子芳, 谢军, 代文才, 高明()   

  1. 西南大学资源环境学院,重庆 400715
  • 收稿日期:2024-07-31 修回日期:2024-09-12 出版日期:2025-07-20 发布日期:2025-05-12
  • 通讯作者: 高明
  • 作者简介:E-mail: gaoming@swu.edu.cn
    陈薪宇(2001-),女,重庆人,在读硕士。E-mail: cxy010414@email.swu.edu.cn
  • 基金资助:
    国家自然科学基金项目(42177019)

The impact of ammonium nitrogen fertilizer application rates on nitrogen leaching and surface electrochemical properties of various purple soils

Xin-yu CHEN(), Zheng-xin DENG, Zi-fang WANG, Jun XIE, Wen-cai DAI, Ming GAO()   

  1. College of Resources and Environment,Southwest University,Chongqing 400715,China
  • Received:2024-07-31 Revised:2024-09-12 Online:2025-07-20 Published:2025-05-12
  • Contact: Ming GAO

摘要:

氮肥施用对世界粮食生产及保障我国粮食安全产生了巨大的作用,为了阐明不同铵态氮肥施用量对不同类型紫色土氮淋失和表面电化学性质的影响,采用盆栽试验,选取3种不同类型的紫色土,设置不施氮肥(CK)、低氮量(N1,每kg土0.1 g纯氮)、中氮量(N2,每kg土0.2 g纯氮)和高氮量(N3,每kg土0.4 g纯氮)4个处理。结果表明:随着氮肥施用量增加,与对照组(CK)相比,N3处理下红棕紫泥土、灰棕紫泥土和棕紫泥土的pH值分别下降了0.9、1.2和0.8。同时,这3种土壤的铵态氮和硝态氮累计淋失量均显著增加(P<0.05),N3处理铵态氮淋失量较对照组(CK)处理分别提升7.1、15.4和12.5倍,CK处理的硝态氮几乎无淋失, N3处理的硝态氮淋失量较N1处理分别提升6.1、4.9和1.8倍(P<0.05)。3种紫色土的表面电位(φ0)、表面电场强度(E0)和表面电荷密度(σ0)均呈相似增长趋势,而比表面积(S)和表面电荷数量(SCN)则下降(P<0.05)。在相同氮肥施用量下,不同类型紫色土的氮淋失和表面电化学性质变化存在差异。在N3处理下,灰棕紫泥土铵态氮累积淋失量显著大于另外两种类型紫色土,而在所有氮肥处理下,灰棕紫泥土的硝态氮累积淋失量显著高于红棕紫泥土(P<0.05);在N1处理下,灰棕紫泥土的φ0较高,但在N3处理下,棕紫泥土的φ0显著高于其他两种土壤类型。在所有处理下,灰棕紫泥土的E0显著高于其他两种土壤(P<0.05);在N2和N3处理下,灰棕紫泥土的σ0也显著高于其他两种土壤类型(P<0.05)。S在N1、N2和N3处理中的表现为红棕紫泥土>棕紫泥土>灰棕紫泥土。在N3处理下,红棕紫泥土的SCN显著高于其他两种土壤类型(P<0.05)。因此,过量施用铵态氮肥会导致紫色土的土壤酸化,显著改变其表面电化学性质,降低对养分的吸附和保持能力。

关键词: 铵态氮肥, 紫色土, 氮淋失, 土壤表面电化学性质

Abstract:

Nitrogen fertilizer application plays an important role in world food production and in ensuring food security in China. To elucidate the effects of different ammonium nitrogen fertilizer application rates on nitrogen leaching and surface electrochemical properties of various types of purple soil, a pot experiment was conducted. Three different types of purple soil were selected, and four treatments were set up: no nitrogen fertilizer (CK), low nitrogen (N1, 0.1 g elemental nitrogen per kg soil), medium nitrogen (N2, 0.2 g elemental nitrogen per kg soil), and high nitrogen (N3, 0.4 g elemental nitrogen per kg soil). The results showed that with increasing nitrogen fertilizer application rates, compared with the control group (CK), the pH values of red brown purple soil, gray brown purple soil, and brown purple soil under the N3 treatment decreased by 0.9, 1.2, and 0.8, respectively. Meanwhile, the cumulative leaching losses of ammonium nitrogen and nitrate nitrogen in these three types of soil increased significantly (P<0.05). The ammonium nitrogen leaching losses under the N3 treatment increased by 7.1, 15.4, and 12.5 times compared with those under the control (CK) treatment, respectively. There was almost no nitrate nitrogen leaching loss in the CK treatment. The nitrate nitrogen leaching losses under the N3 treatment increased by 6.1, 4.9, and 1.8 times compared with those under the N1 treatment, respectively(P<0.05). The surface potential (φ0), surface electric field strength (E0), and surface charge density (σ0) of the three types of purple soil showed similar increasing trends, while the specific surface area (S) and surface charge number (SCN) decreased. Under the same nitrogen fertilizer application rates, there were differences in nitrogen leaching and surface electrochemical properties among the different types of purple soil. In the N3 treatment, the cumulative leaching of ammonium nitrogen in gray-brown purple soil was significantly higher than that in the other two types of purple soil. Additionally, under all nitrogen fertilizer treatments, the cumulative total amount of nitrate nitrogen leached in gray-brown purple soil was significantly higher than that in red-brown purple soil (P<0.05). Under the N1 treatment, φ0 of gray-brown purple soil was higher, while under the N3 treatment, φ0 of brown purple soil was significantly higher than that of the other two soil types. Under all treatments, the E0 of gray-brown purple soil was significantly higher than that of the other two soil types (P<0.05). Furthermore, under the N2 and N3 treatments, the σ0 of gray-brown purple soil was also significantly higher than that of the other two soil types (P<0.05). S under the N1, N2, and N3 treatments ranked: red-brown purple soil>brown purple soil>gray-brown purple soil. Under the N3 treatment, SCN of red-brown purple soil was significantly higher than that of the other two soil types (P<0.05). Therefore, excessive application of ammonium nitrogen fertilizer can lead to soil acidification in purple soils, significantly altering their surface electrochemical properties and reducing their ability to adsorb and retain nutrients.

Key words: ammonium nitrogen fertilizer, purple soil, nitrogen leaching, surface electrochemical properties of soil