Phytopathology. 1998 Apr;88(4):344-50. doi: 10.1094/PHYTO.1998.88.4.344.
ABSTRACT Nematode-trapping fungi, nematodes, and microbial biomass were quantified in conventionally and organically managed field plots in the Sustainable Agriculture Farming Systems Project at the University of California at Davis. There were four replicate plots (0.135 ha per plot) for each management system, and plots were sampled three times each year for 2 years. The hypothesis that nematode-trapping fungi would be more abundant in organically managed plots was partially supported: the number of species of nematode-trapping fungi was slightly but significantly greater in organic than in conventional plots, two species (Arthrobotrys dactyloides and Nematoctonus leiosporus) were detected more frequently in organic plots, and the population densities of A. dactyloides and N. leiosporus were greater in organic than in conventional plots. Two other species (A. haptotyla and A. thaumasia), however, tended to be more numerous in conventional than in organic plots, and the total density of nematode-trapping fungi was similar in organic and conventional plots. Bacterivorous nematodes were more abundant and microbial biomass (substrate-induced respiration) was greater in organic than in conventional plots. Suppression of the root-knot nematode Meloidogyne javanica, as measured in a bioassay, was not related to management system or population density of nematode-trapping fungi but was positively related to microbial biomass.
摘要 在加利福尼亚大学戴维斯分校的可持续农业耕作系统项目中，对常规管理和有机管理的田间试验小区进行了线虫诱捕真菌、线虫和微生物生物量的定量分析。每个管理系统有 4 个重复小区（每个小区 0.135 公顷），每年进行 3 次采样，共进行了 2 年。线虫诱捕真菌在有机管理小区中更为丰富的假设得到了部分支持：线虫诱捕真菌的物种数量略高于常规小区，但差异显著，有 2 个种（Arthrobotrys dactyloides 和 Nematoctonus leiosporus）在有机小区中更为频繁地被检测到，且 A. dactyloides 和 N. leiosporus 的种群密度在有机小区中大于常规小区。然而，另外 2 个种（A. haptotyla 和 A. thaumasia）在常规小区中的数量多于有机小区，且线虫诱捕真菌的总密度在有机和常规小区中相似。有机小区中的食细菌线虫更为丰富，微生物生物量（基质诱导呼吸）大于常规小区。生物测定法测定的根结线虫 Meloidogyne javanica 的抑制作用与管理系统或线虫诱捕真菌的种群密度无关，但与微生物生物量呈正相关。
