INTERSPECIFIC DIFFERENCES OF THE ROOT-SYSTEM STRUCTURES OF 4 CEREAL SPECIES AS AFFECTED BY SOIL COMPACTION

被引：42

作者：

IIJIMA, M

KONO, Y

机构：

[1] School of Agriculture, Nagoya University, Chikusa, Nagoya

来源：

JAPANESE JOURNAL OF CROP SCIENCE | 1991年 / 60卷 / 01期

关键词：

CEREAL ROOT SYSTEM STRUCTURES; INTERSPECIFIC DIFFERENCES; LATERAL ROOT DEVELOPMENT; MECHANICAL IMPEDANCE; ROOT SYSTEM MORPHOMETRY; ROOT EXTENSION RATE; SOIL COMPACTION; SOIL PHYSICAL ENVIRONMENT;

D O I：

10.1626/jcs.60.130

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Comparison of the root system structures of four cereal species as affected by soil compaction was conducted morphometrically. Plants were grown under two different soil bulk densities of 1.33 g/cm3 (control) and 1.50 g/cm3 (compact) for two weeks in the root box, and measurements were made on the number, length and diameter of all the roots from every component of the root system. Promoted or less restricted growth was recognized in the mean length and number of higher order laterals in every species under compact treatments. The increased occurrence of L-type lateral roots in the compact treatment contributed to the promoted growth of higher order laterals. Compared to upland rice and Job's tears, sorghum and maize showed higher restriction in both shoot and root growth. As for the occurrence ratio of L-type laterals in the compact treatment, the former two species had 1.5 to 3 times that of the latter two species. Regardless of root diameter, the species with longer root length showed higher restriction of total root length in both 1st and 2nd order laterals. It was suggested that the ability to produce L-type laterals and extension rate of each order lateral roots were closely related to root growth responses under mechanically impeded soil conditions.

引用

页码：130 / 138

页数：9

共 17 条

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