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应用生态学报 ›› 2004, Vol. ›› Issue (2): 215-220.

• 研究论文 • 上一篇    下一篇

大豆柑桔间作系统中磷的分配和迁移规律研究

周卫军1, 王凯荣1, 李合松2   

  1. 1. 中国科学院亚热带农业生态研究所, 长沙, 410125;
    2. 湖南农业大学理学院, 长沙, 410125
  • 收稿日期:2002-05-07 修回日期:2002-12-18 出版日期:2004-02-15
  • 通讯作者: 王凯荣
  • 基金资助:
    中国科学院知识创新工程资助项目(KZCX2407)

Phosphorus translocation and distribution in intercropping systems of soybean (Glycine max) and citrus (Citrus poonensis)

ZHOU Weijun1, WANG Kairong1, LI Hesong 2   

  1. 1. Institute of Subtropical Agricultual Ecology, Chinese Academy of Sciences, Changsha 410125, China;
    2. Sciences College of Hunan Agricultural University, Changsha 410125, China
  • Received:2002-05-07 Revised:2002-12-18 Online:2004-02-15

摘要: 用微区试验和32P同位素示踪技术,比较研究了大豆、柑桔间作和单作条件下,P在大豆和柑桔体中的分配、转移及其在土壤中的迁移规律.结果表明,间作大豆的吸P量和各部位累积P量显著地低于单作大豆;32P肥料浅施,间作大豆吸收的32P量显著低于单作大豆;32P肥料深施,间作大豆吸收的32P量显著高于单作大豆,但间作不影响P和32P在各部位的转移和分配.间作柑桔吸收的32P量显著低于单作柑桔.柑桔新吸收的32P可快速向地上部分输送,并优先供应生长活跃部位.间作不影响32P在柑桔各部位的转移和分配,但是P肥深施使柑桔吸收的32P向地上部分和生长活跃部位的转移速率减慢.间作使土壤中P的生物移动性增强,可促进土壤深层P向土壤浅层迁移.试验结果表明,大豆柑桔间作磷肥的施用深度以保持在20cm以内为佳.

Abstract: A field mini-plot experiment was conducted on clay loamy oxisol using 32P trace technique when P fertilizer was applied in three depth soil (15, 35 and 55 cm soil layer) to compare P absorption, distribution and translocation in plant organ and soil profile under soybean and citrus monoculture and intercropping at Taoyuan Experimental Station of Agroecosystem Research of Chinese Academy of Science. Total P uptake (PT) and P accumulation in different parts (PA) of soybean were remarkably decreased under intercropping. When 32P was applied in topsoil (15 cm soil layer), 32P uptake ( 32PT) by soybean was significantly lower in intercropping than in monoculture. Whereas 32PT uptake by soybean was significantly greater in intercropping than in monoculture when 32P was applied in deep soil layer (35 cm or 55 cm soil layer). However, considerable difference was not observed for 32P translocation and distribution among soybean organs. 32PT uptake by citrus was much lower under intercropping than under monoculture. The P uptake by citrus newly could be transferred rapidly to aboveground and prior to active growing organ. Intercropping did not affect 32P distribution in citrus organ, but when P was applied in deep soil layer, the speed of 32P transferred to aboveground and active organ was slowed down. P mobility was strengthened in soil profile, and P of deep soil layer was promoted to move to topsoil in intercropping. The experimental results showed the optimal depth of applied P should be within 20 cm soil layer in soybean-citrus intercropping system.

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