摘要
采用根箱分室土培方法,研究了两个不同耐铝性玉米自交系在两种不同pH土壤根际的营养状况.结果表明,两自交系根际Al、P、Ca等元素的含量和分布不同.酸性土壤根表附近土壤Al含量明显高于远根际区域,耐铝自交系根际土壤铝的含量显著高于敏感自交系.中性土壤上两自交系距根表0～4cm区域为一典型的P耗竭区,而酸性土壤上P耗竭区相对较小,在距根表0～2.5cm范围.酸性土壤上耐铝自交系距根系1～2.5cm区域P含量较高,对P的活化能力相对较强.酸性土壤根系附近Ca含量显著低于中性土壤.耐铝自交系根系对Ca、Mg的吸收能力相对较强,在酸性土壤的0～2.5区域形成一明显的Ca耗竭区.
The rhizosphere nutrition in two kinds of soil (pH4.6 or 6.8) was studied in two inbred lines of maize (Z01: Al-tolerant, Z02: Al-sensitive) by the means of 3-compartment root box. The available Al?P?Ca content and distribution in root region showed difference between two kinds of soil with different pH, but the content and distribution of available K was basically same. The Al content in the acid soil near the root (0~1cm) was significantly higher than that in far-from-root region. The Al content in soil of root region of Al-tolerant inbred lines Z01 was significant higher than that of Al-sensitive ones, and Al-tolerant inbred lines Z01 had strong excluding capability to Aluminum. There was a P gradient in 0~4 cm region that declined from far-from-root region to root surface in two inbred lines in neutral soil, but the P declined gradient only existed in 0~2.5 cm region near root surface in acid soil. In acid soil, the P content of Al-tolerant inbred lines Z01 in 1~2.5 cm region near root surface was relative higher and mobilizing ability to P was relative stronger. The Ca content of root region in the acid soil was significant lower than that of neutral soil. In acid soil, the Ca?Mg absorbing capability of the roots in Al-tolerant inbred lines Z01 was relatively stronger, and an obvious Ca declined gradient in 0~2.5 cm region from far-root region to root surface was found in tolerant line, but in sensitive lines Z02 it had a small change.
出处
《中国农学通报》
CSCD
2004年第4期191-195,224,共6页
Chinese Agricultural Science Bulletin
基金
华中农业大学作物遗传改良国家重点实验室"高等学校实验室访问学者基金"项目
