热带作物学报2012，Vol.33Issue(8)：1342-1347,6.
水肥耦合对橡胶树根系垂直分布的影响
Coupling Effects of Water and Fertilizer on Vertical Distribution Characteristics of Fine Roots of Hevea brasiliensis
摘要
Abstract
Nutrients and water are two limiting factors on rubber growth and latex yield. With 17 year-old Hevea brasiliensis of Clone SCATC 7-33-97 as the test materials, the comprehensive coupling effects of application amount of chemical N, P and K fertilizers, and irrigated water on vertical distribution characteristics of fine roots of rubber tree were studied under rubber field condition. The results showed that, the fine roots of rubber tree mainly distributed in 0~20 cm soil layer, with the increase in the depth of soil layer, rubber roots showed a decreasing trend in their vertical distribution, it could be expressed by power function model, increasing N or P fertilizer appropriately could promote the root growth of 0 -20 cm soil layer, but the proportion of deep roots increased when the amount of nitrogen fertilizer was too high. Lower soil moisture content was found good for roots elongation that enabled them to penetrate more deeply into the soil for more water uptake at the expense of root number and dry weight. On the whole, positive coupling effects were found existing between soil water and N fertilizer, soil water and P fertilizer on the root dry weight. Among different water and fertilizers combinations, the roots always gave the highest dry weight in each soil layer under the treatment of sufficient fertilizer + sufficient water dosage combination, and they could reach to 0.33 kg/m3 and 0.31g kg/m3, separately. The roots dry weight was significantly correlated with the content of organic matter, NO3"-N, NH4*-N, available P and among the layers of whole soil profile.关键词
水肥耦合/橡胶树/根系/垂直分布Key words
Coupling effects of water and fertilizer/ Rubber tree (Hevea brasiliensis)/ Roots/ Vertical distributioncharacteristics分类
农业科技引用本文复制引用
华元刚,罗微,林钊沐,茶正早,林清火,陈秋波..水肥耦合对橡胶树根系垂直分布的影响[J].热带作物学报,2012,33(8):1342-1347,6.基金项目
国家现代农业产业技术体系建设专项资金(No.CARS-34-GW6) （No.CARS-34-GW6）
中国热带农业科学院橡胶研究所基本科研业务费(No.1630022012003). （No.1630022012003）
