土壤Issue(3)：67-72,86,7.DOI:10.11838/sfsc.20160311
砂培条件下两种磷效率棉花根系形态及根际特征差异
Effect of phosphorus levels on root morphology and rhizospheric characteristic between the different phosphorus ef-ficiency cotton under sand culture condition
摘要
Abstract
The experiment was conducted to investigate effects of different P levels ( P1 0. 1 mmol/L, P2 5 mmol/L) on root morphology and characteristics of rhizosphere in different P-efficiency cotton under the gravel culture conditions. Two differ-ent P-efficient cotton genotypes (the P efficient ZM42 and the P inefficient XLZ13) were selected for the study. Crop bio-mass, P uptake amount, root morphology, available P, pH and phosphatase activity in the rhizosphere were measured. Result showed that under the sand culture cotton biomass and accumulation of phosphorus increased with phosphorus applica-tion for both the P-efficient genotypes cotton. Root biomass, P uptake and root to shoot ratio of ZM42 was better than XLZ13. length of fine root (0~0. 4 mm) in ZM42 was looger than XLZ13, and the proportion of fine roots in the total root length was higher, which was helpful to promote phosphorus absorption of plant. When the phosphorus content in growth medium was lower, to reduce the pH in the cotton rhizosphere also decreased. The pH of the rhizosphere of ZM42 was sig-nificantly higher than XLZ13. Rhizosphere phosphatase activity of two kinds of phosphorus efficiency cotton was increased as the phosphorus content decreased in the two periods. Phosphatase activity of ZM42 was higher than that of XLZ13. Thus, there was a difference with rhizosphere mechanism between the two phosphorus efficiency of cotton in the same growth medi-um, the change of root morphology characteristic of the P efficient cotton was one of the main mechanisms of rhizosphere phosphorus activation.关键词
磷效率/棉花/根系形态/根际特征Key words
phosphorus efficient/cotton/root morphology/rhizosphere characteristic分类
农业科技引用本文复制引用
王靓,盛建东,陈波浪..砂培条件下两种磷效率棉花根系形态及根际特征差异[J].土壤,2016,(3):67-72,86,7.基金项目
国家自然科学基金项目(31260499)；新疆自治区土壤学重点学科。 （31260499）
