title: Non-native plants and soil microbes: potential contributors to the consistent reduction in soil aggregate stability caused by the disturbance of North American grasslands.
abstract: • Soil aggregate stability is an important ecosystem property that is altered by anthropogenic disturbance. Yet, the generalization of these alterations and the identification of the main contributors are limited by the absence of cross-site comparisons and the application of inconsistent methodologies across regions. • We assessed aggregate stability in paired remnant and post-disturbance grasslands across California, shortgrass and tallgrass prairies, and in manipulative experiments of plant composition and soil microbial inoculation. • Grasslands recovering from anthropogenic disturbance consistently had lower aggregate stability than remnants. Across all grasslands, non-native plant diversity was significantly associated with reduced soil aggregate stability. A negative effect of non-native plants on aggregate stability was also observed in a mesocosm experiment comparing native and non-native plants from California grasslands. Moreover, an inoculation study demonstrated that the degradation of the microbial community also contributes to the decline in soil aggregate stability in disturbed grasslands. • Anthropogenic disturbance consistently reduced water-stable aggregates. The stability of aggregates was reduced by non-native plants and the degradation of the native soil microbial community. This latter effect might contribute to the sustained decline in aggregate stability following anthropogenic disturbance. Further exploration is advocated to understand the generality of these potential mechanisms.
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.|Centro de Investigaciones Cientificas, Escuela Politécnica del Ejército-ESPE, Av. Gral. Rumiñahui s/n Sangolquí, Ecuador.
authors: Jessica
authors: J
authors: Duchicela
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.
authors: Keith M
authors: KM
authors: Vogelsang
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.
authors: Peggy A
authors: PA
authors: Schultz
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.
authors: Wittaya
authors: W
authors: Kaonongbua
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.
authors: Elizabeth L
authors: EL
authors: Middleton
authors: Department of Biology, Indiana University, 1001 E. 3rd Street, Jordan Hall 142, Bloomington, IN 47405-7005, USA.
authors: James D
authors: JD
authors: Bever
mesh_terms: D000383:Agriculture; D000818:Animals; D001419:Bacteria; D044822:Biodiversity; D017753:Ecosystem; D060434:Herbivory; D058865:Introduced Species; D009656:North America; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D013045:Species Specificity; D014867:Water / Q000737:chemistry
chemical_list: D012987:Soil; D014867:Water