| 我国玉米品种更替过程中根系时空分布特征的演变 |
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| 引用本文： | 王空军,郑洪建,等.我国玉米品种更替过程中根系时空分布特征的演变[J].植物生态学报,2001,25(4):472-475. |
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| 作者姓名： | 王空军 郑洪建 |
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| 作者单位： | [1]中国科学院植物研究所植被数量生态学开放研究实验室，北京100093 [2]山东农业大学农学院，泰安271018 |
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| 基金项目： | 国家自然科学基金(39470420)、国家重大基础科研与发展计划项目(G1998010100)和山东农业良种产业化工程项目 |
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| 摘 要： | 采用土柱栽培与大田试验相结合的方法，研究了我国20世纪50年代以来生产中大面积推广应用的玉米品种根系时空分布特性。研究指出：玉根系的生长动态符合水蒸汽压力模型（Vppor Pressure Model),1990s品种根系干物质积累量随生育进程的推进增加迅速，直到成熟期仍维持较高水平，开花后根重持续时间长，且在深层土壤中的优势明显。在深40－100cm土层内根系重量1990s品种分别比1970s品种和1950s品种高出75％和1060％，当代品种根系在深层土壤中所占比率也明显增加；在距离植株0－10cm的水平范围内，当代玉米品种根系分布数量多、比率大。随玉米品种更替根系的空间分布呈“横向紧缩，纵向延伸”的特点。
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| 关 键 词： | 玉米 品种更替 根系时空分布 演变特征 |
| 修稿时间： | 2000年10月11 |
EVOLUTION OF MAIZE ROOT DISTRIBUTION IN SPACE-TIME DURING MAIZE VARIETIES
REPLACING IN CHINA |
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| WANG Kong Jun , ZHENG Hong Jian LIU Kai Chang ZHANG Ji Wang DONG Shu Ting and HU Chang Hao.EVOLUTION OF MAIZE ROOT DISTRIBUTION IN SPACE-TIME DURING MAIZE VARIETIES
REPLACING IN CHINA[J].Acta Phytoecologica Sinica,2001,25(4):472-475. |
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| Authors: | WANG Kong Jun ZHENG Hong Jian LIU Kai Chang ZHANG Ji Wang DONG Shu Ting and HU Chang Hao |
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| Affiliation: | WANG Kong Jun *,1,2 ZHENG Hong Jian 2 LIU Kai Chang 2 ZHANG Ji Wang 2 DONG Shu Ting 2 and HU Chang Hao 2 |
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| Abstract: | Field and limited soil cylinder cultivation of widely grown maize cultivars released from 1950s to 1990s in China was conducted in order to investigate differences in the growth of the root system through space and time. Dry matter accumulation of maize roots agreed with a Vapor Pressure Model. Root weight of 1990s cultivars increased rapidly as plants grew and a long period of high root weight continued from anthesis until maturity; this trend became more evident with deeper soil. 1990s maize cultivars root weight in 40 100 cm soil depth were 75% and 1060% higher than those of 1970s and 1950s, respectively; the proportion of roots in this layer was also much higher. The percentage of roots that were located within a horizontal area 0 10 cm soil from the plant center was also higher than in cultivars of 1970s and 1950s. We conclude that the historical development in maize cultivars has led to increased vertical extension and horizontal contraction. |
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| Keywords: | Maize ( Zea mays L ) Cultivar replacement Root distribution in space time Rule of improvement |
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