SOIL RESOURCES, MICROBIAL ACTIVITY, AND PRIMARY PRODUCTION ACROSS AN AGRICULTURAL ECOSYSTEM

摘要: The degree to which soil resource availability is linked patterns of microbial activity and plant productivity within ecosystems has important consequences for our understanding how are structured the management systems agricultural production. We studied this linkage in a 48-ha site southwest Michigan, USA, that had been cultivated planted row crops decades. Prior seeding genetically identical soybean plants (Glycine max) early spring, we removed samples from ≈600 locations; biomass was harvested these same locations later season. Soil were analyzed physical properties (texture, bulk density), chemical (moisture, pH, total C, N, inorganic N), biological attributes (microbial biomass, population size, respiration potential, nitrification N-mineralization potentials). Plant analyses included C N contents. variability across long-cultiva...