不同供磷水平对柱花草和黑籽雀稗根际生理活性的影响

以热带柱花草和黑籽雀稗为材料,通过盆栽试验,研究不同磷水平对其根际酸性磷酸酶、微生物数量及根系活力的影响。结果表明：2种牧草根际酸性磷酸酶(ACP)活性随着磷浓度的增加而降低,在低磷(P0)处理时达最高,柱花草的ACP活性为603.24 mg/(kg·h),黑籽雀稗为367.21 mg/(kg·h)。当高磷浓度处理时,柱花草根际ACP活性较黑籽雀稗低。各处理中,柱花草的根际微生物总量较黑籽雀稗高,柱花草根际真菌的数量随磷浓度的增加而减少,处理间差异达极显著水平,低磷处理时土壤真菌数量较多,这有利于根瘤菌的形成。2种牧草的根系活力随着施磷浓度的增加而递减。黑籽雀稗根系活力P0处理极显著高于P3和P4处理,显著高于P2处理。黑籽雀稗根系活力受供磷水平的影响大于柱花草。

Influence of Different Phosphorus Levels on Black Seeds Paspalum Rhizosphere Physiological Activity

This research adopts the pot experiment, taking tropic and slack-seed paspalum as materials to study the effects of different levels of phosphorus on rhizosphere acid phosphatase, microorganism quantity and root activity. The results show that the rhizosphere acid phosphatase activity of both grasses decreased with the increase of phosphorus concentration, and reached the highest in low phosphorus (P0) was 603.24 mg/(kg·h) and slack-seed paspalum was 367.21 mg/(kg·h). When the phosphorus concentration is high, the rhizosphere acid phosphatase activity of is lower than slack-seed paspalum's. The total quantity of rhizosphere microorganism of is higher than slack-seed paspalum's in each treatment. the quantity of rhizosphere Fungi increased with the increase of phosphorus concentration, and the difference was extremely significant among treatments, and the mass of soil fungi was large when it had low phosphorus, which is conducive to the formation of Rhizobium. Two grasses' root activity decreased when the concentration of phosphorus decreased. The root activity of black seed paspalum of P0 treatment was extremely significantly higher than P3 and P4 treatment, significantly higher than the P2 treatment. The phosphate levels effect on the root activity of slack-seed paspalum greater than.