文章基本信息

标题：Towards an empirical relationship between root length density and root number in windbreak-grown cadaghi (Corymbia torelliana) trees
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作者：Bijay Tamang ; Michael G. Andreu ; Christina L. Staudhammer 等
期刊名称：Plant Root
电子版ISSN：1881-6754
出版年度：2011
卷号：5
页码：40-45
DOI：10.3117/plantroot.5.40
出版社：Japan Science and Technology Information Aggregator, Electronic
摘要：Because windbreaks are planted for sustainable agriculture but may lower crop yields near them due to competition, suitable competition mitigation methods must be applied at the windbreak-crop interface to increase crop yields. Effective underground competition management requires information on important root variables such as preferential root growth direction and root length density (RLD, root length per unit volume of soil). This study examined root isotropy (i.e., uniformity in all directions) in windbreak- grown cadaghi ( Corymbia torelliana ) trees in south Florida and developed an empirical relationship between RLD and number of roots (N) per unit of surface of soil exiting the trench face. Numbers of roots exiting the frontal face parallel to the windbreak (N_X), vertical face perpendicular to the frontal face (N_Y), and basal horizontal face (N_Z) of 10 x 10 x 10 cm soil cubes were counted. Cadaghi roots were anisotropic and had horizontal growth preference. Average root numbers were ranked N_X>N_Y>N_Z. Both N_X and the average root number exiting X, Y and Z faces of the soil cube (N_AVG) were significant variables for estimating RLD. The coefficients of N_X and N_AVG were 1.1 and 3.1. These results should be helpful to manage underground competition effectively at the windbreak-crop interface to improve crop yields.
关键词：competition mitigation;root isotropy;root management;trench profile;windbreak