Decline in Soil Microbial Abundance When Camelina Introduced Into a Monoculture Wheat System.

摘要: Camelina [Camelina sativa (L.) Crantz] of the Brassicaceae family is a potential alternative and oilseed biofuel crop for wheat (Triticum aestivum L.)-based cropping systems Inland Pacific Northwest (PNW) United States. We investigated effect this relatively new rotational on soil microbial communities. An 8-year experiment was initiated in 2007 at Lind, WA, to compare 3-year rotation winter (WW)-camelina (C)-fallow (F) typical 2-year WW-F rotation. All phases both rotations (total = 20 plots) were present every year allow valid statistical analysis data interpretations. Monoculture dominant system practiced by vast majority farmers 1.56 million ha cropland PNW drylands that receive <300 mm average annual precipitation. Microbial abundance community composition determined using phospholipid fatty acid (PLFA) from samples collected during 3 consecutive years beginning 2010. The fungi, mycorrhizae, Gram positive negative bacteria, total all declined over period WW-C-F compared lipid biomarkers significantly less fallow WW demonstrated few differences structure between phases. shifted likely due combination Brassica followed 13-month-long fallow. results study suggest camelina with may disrupt communities have become stable under historical monocropping. Such disturbances affect processes been provided wheat-adapted However, disruption appears be short-lived rotation, returning similar levels observed