Griffiths B S, Welschen R, van Arendonk J J C M, Lambers H
Soil-Plant Dynamics Group, Department of Cellular and Environmental Physiology, Scottish Crop Research Institute, Invergowrie, DD2 5DA, Dundee, Scotland.
Department of Plant Ecology and Evolutionary Biology, University of Utrecht, P.O. Box 800.84, 3508 TB, Utrecht, The Netherlands.
Oecologia. 1992 Aug;91(2):253-259. doi: 10.1007/BF00317793.
Microbial growth in the rhizosphere is affected by the release of organic material from roots, so differences in carbon budgets between plants may affect their rhizosphere biology. This was tested by sampling populations of bacteria and bacteriophagous fauna from the rhizosphere of Lolium perenne, Festuca arundinacea, Poa annua, and Poa pratensis, under conditions of high and low nitrate availability. Concentrations of soluble phenolics and lignin varied considerably between the species but were not related to differences in rhizosphere biology. L. perenne and F. arundinacea supported fewer bacteria than the Poa species. There was no significant rhizosphere effect on the groups of protozoa. The major indicators of rhizosphere productivity were the bacterial-feeding nematodes (mainly Acrobeloides spp.), and there was a large positive effect of added nitrate. Nematode biomass was significantly lower in the rhizosphere of the slow-growing P. pratensis compared with the fast-growing P. annua, indicating that the differential allocation of carbon has affects on rhizosphere biology. A large rhizosphere effect on enchytraeid worms was also observed, and their potential importance in the rhizosphere is discussed.
根际微生物的生长受根系释放有机物质的影响，因此植物之间碳预算的差异可能会影响其根际生物学特性。通过在高硝酸盐有效性和低硝酸盐有效性条件下，对黑麦草、高羊茅、一年生早熟禾和草地早熟禾根际的细菌和噬菌性动物种群进行采样，对此进行了测试。可溶性酚类物质和木质素的浓度在不同物种之间差异很大，但与根际生物学特性的差异无关。黑麦草和高羊茅支持的细菌比早熟禾属物种少。根际对原生动物群体没有显著影响。根际生产力的主要指标是食细菌线虫（主要是小杆属线虫），添加硝酸盐有很大的正向影响。与生长迅速的一年生早熟禾相比，生长缓慢的草地早熟禾根际线虫生物量显著较低，这表明碳的差异分配对根际生物学特性有影响。还观察到根际对蚯蚓有很大影响，并讨论了它们在根际的潜在重要性。
