期刊论文

中文

西北农业学报

1004-1389

2005

14

1

137-141

10.3969/j.issn.1004-1389.2005.01.031

湖南农业大学***科研启动基金资助；

本校为第一机构

分别用氯化三苯基四氮唑(TTC)还原法和甲基蓝吸附法测定玉米根系活力和吸收面积,研究其0～15 cm土层根系的水平分布和离主茎0～20 cm范围土壤根系的垂直分布情况.结果表明,TTC还原量在离主茎0～20 cm的水平方向和离地面0～45 cm的垂直方向上,随着离主茎距离的增加和土层深度的加深而降低.TTC还原强度在水平方向上与TTC还原量的变化趋势类似,只是个别生育期15～20 cm处回升;在垂直方向上与TTC还原量的变化趋势相反,随土层深度的加深而增加.同样范围内根系总吸收面积和活跃吸收面积的变化趋势与TTC还原量相同;而比吸收面积和比活跃吸收面积,在水平方向上随着离主茎距离的增加而明显增加,在垂直方向...

The space distributions of maize root were studied by measuring the maize root activity and its absorbing area with the methods of TTC reducing and methyl-blue absorption separately. The results indicated that TTC reducing intensity and its amounts gradually decreased from near to far in range of 0～20 cm at the horizontal directions, only at the earlier growth stage, going up again in the range of 15～20 cm. TTC reducing intensity progressively increased with increases of the soil layer depth in the range of 0～45 cm at the vertical directions...