椰园间种不同牧草对椰子根际微生物的影响

Influence of Interplanting Different Forage Grass to Coconut Rhizosphere Microorganisms

对间种不同牧草的椰子树根际微生物数量及种群结构变化进行了比较研究,结果表明:间种不同牧草椰子树根际微生物数量存在显著差异,间种柱花草(Stylosanthes guianensis cv.ReyanⅡ)的椰子根际细菌的数量最多,间种坚尼草(Pani-cum maximum CIAT6901)的椰子根际细菌数量最少;根际放线菌的数量,以不间种牧草的最多,间种网麦旗草(Brachiaria dicty-oneura stapf)的最少。根际真菌的数量,以间种坚尼草的最多,间种网麦旗草的最少。不间种牧草的椰子根际最适于多数细菌的生长与繁殖,类群最为丰富,但其类群的优势度低于间种牧草的处理。

The quantities and population structure changes of coconut rhizosphere microorganisms were studied in this paper. Resuits indicated that the quantities of coconut rhizosphere microorganisms varied significantly based on intercopping different forage grass. For bacteria, it had the highest quantities by intercropping Stylosanthes guianensis cv. Reyan II. However, the lowest quantities appeared if imercropping Panicum maximum CIAT6901. For actinomyces, the highest quantities were got without any forage grass in- tercmpped, while it had the lowest quantities by intercropping Brachiaria dictyoneura Stapf. For fungi, Panicum maximum CIAT6901 was the best grass for being intercropped, while the worst was Brachiaria dictyoneura Stapf. Our data also proved that it was better for growth and reproduction of most bacteria when no forage grass was interempped with coconut. However, this caused lower population dominance though higher population abundance.