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作 者 ：周卫军,王凯荣,李合松

期 刊 ：生态学报 2003年 23卷 12期 页码：2565~2572

关键词：大豆；柑桔；农林间作；32P；磷吸收；

Keywords:soybean, cirrus, intercropping ecosystem, （）~（32）P, absorption characteristic,

摘 要 ：微区试验和 32 P同位素示踪技术研究大豆 -柑桔间作系统中大豆和柑桔对不同土层中磷的吸收特征表明 ,大豆 -柑桔间作大豆与柑桔对浅层磷具有强烈竞争作用 ,大豆和柑桔对浅层磷的利用率分别降低41 .5 %和 1 4.7% ,浅层磷肥对大豆和柑桔的供应量分别降低 346.8mg/区和 1 48.1 mg/区。柑桔对土壤深层磷的吸收能力比大豆强 ,单作大豆对浅层磷的利用率比单作柑桔高 1 0 4 .8% ,而对 35 cm和 5 5 cm土层磷的利用率分别比单作柑桔低 2 5 .6%和 878.3%。大豆基本不能利用 5 5 cm及其以下的磷 ,利用率小于0 .1 %。大豆 -柑桔间作可以提高大豆对深层磷肥的利用率 ,间作大豆对 35 cm和 5 5 cm土层磷肥的利用率比单作大豆分别高 32 .3%和 1 75 .0 %。

Abstract:The characteristics of ()~(32)P uptake by soybean and citrus among monoculture and intercropping systems were studied with field micro-plot trials and ()~(32)P isotope technique. A field experiment was conducted at Taoyuan Experimental Station of Agro-ecosystem Research of CAS from April to Jun in 2001. The experimental soil is acidic with pH of 4.45. The citrus tree were planted in plots of 3m×3m in row and line distance in Dec. 1995. The soybean was seeded 4 round around citrus tree within diameter of 3m ...

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