高寒山区混播草地燕麦和毛苕子根长密度分布格局

生态学杂志

高寒山区混播草地燕麦和毛苕子根长密度分布格局

盛亚萍,赵成章^**,张静,任珩,李丽丽

(西北师范大学地理与环境科学学院，甘肃省湿地资源保护与产业发展工程研究中心，兰州 730070)

出版日期:2013-02-10 发布日期:2013-02-10

Spatial distribution patterns of root length density of Avena sativa and Vicia villosa in their mixed-sowing grassland in alpine region.

SHENG Ya-ping, ZHAO Cheng-zhang^**, ZHANG Jing, REN Heng, LI Li-li

(Research Center of Wetland Resources Protection and Industrial Development Engineering of Gansu Province, College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China)

Online:2013-02-10 Published:2013-02-10

摘要/Abstract

摘要： 植物通过维系根长密度的大小及其分布格局逐渐优化资源利用格局。本实验在祁连山地建立禾本科牧草燕麦与豆科毛苕子混播草地，按燕麦(Avena sativa)与毛苕子(Vicia villosa)的密度比例设置CK₁(0∶10)、Ⅰ(6∶4)、Ⅱ(5∶5)、Ⅲ(4∶6)、Ⅳ(2∶8)和CK₂(10∶0) 6个密度组，研究了混播草地燕麦与毛苕子根系根长密度的空间分布格局。结果表明：混播草地燕麦和毛苕子根长密度显著大于单播处理，并且随着混播草地中燕麦密度的减小，牧草根长密度逐渐增大，出现高燕麦密度低根长密度的现象；在空间分布上燕麦和毛苕子根长密度表现出明显差异，燕麦根系主要分布在0～25 cm土层，毛苕子根系主要分布在0～15 cm土层。根系的分层分布改变了其竞争格局，垂直分布上出现的差异使根系结构和形态逐渐发生转变，混播处理使Ⅰ、Ⅱ、Ⅳ处理的主根生长受到抑制，5个处理的侧根生长受到促进。一年生牧草侧根在空间上的分层分布改变了混播草地的资源利用格局，逐渐优化了根长密度配置格局，实现了土壤资源利用最大化的目标。

Abstract: Plant can adjust its root length density and distribution pattern to optimize its resources utilization pattern. In this study, the mixedsowing grassland of gramineous grass Avena sativa and leguminous grass Vicia villosa with the density ratio of 0∶10 (CK₁), 8∶2 (Ⅰ), 6∶4 (Ⅱ), 5∶5 (Ⅲ), 4∶6 (Ⅳ), 2∶8 (Ⅴ), and 10∶0 (CK₂) was established in the upper reaches of Shiyang River in Sunan County of Gansu Province, Northwest China in 2010, aimed to study the spatial distribution patterns of root length density of the two mixedsowing grasses. The root length density (RLD) of the two grasses was greater in mixed culture than in monoculture. With the decrease of A. sativa density in mixedsowing grassland, the RLD of the grass had a gradual increase, showing a phenomenon of high A. sativa density and low A. sativa RLD. Spatially, the RLD of A. sativa and V. villosa had obvious difference. A. sativa roots were mainly distributed in 0-25 cm soil layer, while V. villosa roots were concentrated in 0-15 cm soil layer. The hierarchical distribution of the roots changed their competition pattern, and the difference in the vertical distribution gradually changed the root structure and morphology. In the treatments except CK1 and CK2, the taproot growth was restrained, while the lateral root growth was promoted. The spatial hierarchical distribution of the lateral roots in the mixed-sowing grassland changed the resource utilization pattern, and gradually optimized the root length density configuration pattern, which achieved the goal of maximizing the resources utilization from soil.

盛亚萍,赵成章**,张静,任珩,李丽丽. 高寒山区混播草地燕麦和毛苕子根长密度分布格局[J]. 生态学杂志.

SHENG Ya-ping, ZHAO Cheng-zhang**, ZHANG Jing, REN Heng, LI Li-li. Spatial distribution patterns of root length density of Avena sativa and Vicia villosa in their mixed-sowing grassland in alpine region.[J]. cje.