摘要
土柱淋溶模拟实验结果表明 ,山地龙眼园土壤Mg2 + 易遭受淋失而导致龙眼缺镁。不同施肥措施对Mg2 + 淋失的影响是 :施KCl促进Mg2 + 的淋失 ;施尿素抑制土柱中的Mg2 + 向下迁移 ,从而减少Mg2 +的淋失 ;施石灰对Mg2 + 淋失无明显影响。三种镁肥品种的Mg2 + 淋失量是MgCl2 ·6H2 O〉〉MgSO4 ·7H2 O>钙镁磷肥。
An indoor simulating experiment was conducted with repacked soil columns for studying the leaching process of magnesium in soil of mountain longan orchards.The objective was to identify the effects of fertilization practices on leaching pattern and magnitudes of Mg 2+ .The treatments were CK(NPK, as a control),NPK+ calcium magnesium phosphate,NPK+ magnesium sulfate,NPK+ magnesium chloride,NP+ magnesium sulfate,PK+ magnesium sulfate,NPK+ magnesium sulfate+lime.The columns were leached with 120ml deionized water daily through peristaltic pump over a period of 92 days.Leacheates were collected once every 7 days .Mg 2+ in the leacheates were determined by atomic absorption spectrometry.At the end of leaching process, soils were sampled from different depths of the soil columns to determine exchangeable magnesium content.Results showed that magnesium was relatively easily leached from soil, and as a result ,caused magnesium deficiency of longan.Application of KCl promoted the leaching of magnesium.Application of urea inhibited the downward movement of exchangeable magnesium ,as a result prevented the leaching of magnesium.The application of CaCO3 scarcely had effects on the leaching lose of magnesium.The leaching amount of magnesium in three magnesium fertilizers treatments was in the following order: magnesium chloride〉〉magnesium sulfate> calcium magnesium phosphate.
出处
《山地学报》
CSCD
2000年第3期248-252,共5页
Mountain Research
基金
国家自然科学基金!( 49771 0 53 )
福建省自然科学基金!(F990 2 0 )项目"福建红壤退化原因与复原研究"的部分内容
关键词
山地
龙眼园
土壤
镁淋失
模拟实验
施肥
soil of mountain longan orchard
leaching of magnesium
simulating experiment
