四川棉区土壤木霉种群分布和生物活性

DISTRIBUTION OF TRICHODERMA SPP IN THE SOIL OF WEST SICHUAN COTTON ZONE AND THEIR BIOLOGICAL ACTIVITIES

本文报告了棉田土壤木霉的种类、生物活性及其垂直分布。从川西棉田土壤中分离到哈茨木霉、拟康氏木霉、康氏木霉、绿色木霉、长枝木霉、黄绿木霉以及桔绿木霉共7个种群。上述7个种群中以哈茨木霉、拟康氏木霉和长枝木霉为优势种群。分别占木霉群体的30％、20％和18％。哈茨木霉主要分布在0-10CM深的土壤上表层;拟康氏木霉和长枝木霉在10-20CM深的较下层土壤。在0-20CM土壤耕作层内。木霉群体密度在不同深度土层并无明显差别。

Trichoderma species and their vertical distribution in cotton soil as well as their biological activities are reported in the present study. Seven Trichoderma species aggregates were isolated from the soil of west Sichuan cotton zone in China: Trichoderma harzianum, T. pseudokoningii, T. longibrachiatum, T. aureoviride, T. citrinoviride, T. koningii and T. viride. The most common species were T. harzianum, T. pseudokoningii and T. longibrachiatum accounted for 30, 20 and 18 per cent respectively. Most of T. harzianum isolates distributed in the upper soil profile 0-10cm deep; but T. pseudokoningii and T. longibrachiatum were mainly in the soil profile 10-20cm deep. The abundance of Trichoderma at the different depth of soil profile in the cultivated soil horzons was about at the same level.