蚯蚓与微生物的相互作用

蚯蚓从成体到卵内均有微生物，微生物来源于蚯蚓生活的环境，在消化消化道时，随食物进入体内的真菌营养体及大部分细菌被杀死，只有真菌的孢子和部分细菌仍保持生活力，生长缓慢的细菌通过蚯蚓消化道后群体下降；而生长快的细菌，由于在消化道内迅速繁殖，在蚯蚓排泄物中的群体数量甚至会超过进入蚯蚓体内时的数量，蚯蚓能促进土表有益和致病微生物在土壤内从向传播，但也能减轻由病原真菌引起的病害。真菌是蚯蚓食物的一部分，消化

INTERACTION BETWEEN EARTHWORMS AND MICROORGANISMS

Microorganisms were observed in both body and cocoons of earthworms.They came from the worm's environment.During passage of food through earthworm gut,vegetative hypha and most of bacteria were killed,only fungal spores and some bacteria remained viable.After passage through the gut,the population of the slow growing bacteria declined.However the fast growing ones reproduced rapidly in the gut so that their number in excreta could be larger than that in the uningested materials.Earthworms enhance the vertical propagation in soils of both beneficial and harmful microorganisms.They could also reduce the severity of some soil born fungal diseases.Fungi seemed to be an important item of earthworm diet,and some digestive enzymes in gut of earthworms might be of microbial origin.Hence microorganisms contributed greatly to assimilation and uptake of organic matter by earthworms.Although a number of evidence suggests that earthworms interact with microorganisms,the mechnisms of the interactions remain to be investigated thoroughly,and the process to be quantified.