草业学报2025，Vol.34Issue(7)：69-82,14.DOI:10.11686/cyxb2024307
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
The impact of ammonium nitrogen fertilizer application rates on nitrogen leaching and surface electrochemical properties of various purple soils
摘要
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.关键词
铵态氮肥/紫色土/氮淋失/土壤表面电化学性质Key words
ammonium nitrogen fertilizer/purple soil/nitrogen leaching/surface electrochemical properties of soil引用本文复制引用
陈薪宇,邓正昕,王子芳,谢军,代文才,高明..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[J].草业学报,2025,34(7):69-82,14.基金项目
国家自然科学基金项目(42177019)资助. （42177019）
