Soil bacterial abundance and diversity better explained and predicted with spectro-transfer functions
MetadataShow full item record
© 2018 Soil bacteria play a critical role in the functioning of ecosystems but are challenging to investigate. We developed state-factor models with machine learning to understand better and to predict the abundance of 10 dominant phyla and bacterial diversities in Australian soils, the latter expressed by the Chao and Shannon indices. In the models, we used proxies for the edaphic, climatic, biotic and topographic factors, which included soil properties, environmental variables, and the absorbance at visible–near infrared (vis–NIR) wavelengths. From a cross-validation with all observations (n = 681), we found that our models explained 43–73% of the variance in bacterial phyla abundance and diversity. The vis–NIR spectra, which represent the organic and mineral composition of soil, were prominent drivers of abundance and diversity in the models, as were changes in the soil-water balance, potential evapotranspiration, and soil nutrients. From independent validations, we found that spectro-transfer functions could predict well the phyla Acidobacteria and Actinobacteria (R2 > 0.7) as well as other dominant phyla and the Chao and Shannon diversities (R2 > 0.5). Predictions of the phyla Firmicutes were the poorest (R2 = 0.42). The vis–NIR spectra markedly improved the explanatory power and predictability of the models.
Showing items related by title, author, creator and subject.
Oil mallee plantings and arthropod biodiversity in the Western Australian wheatbelt : effects of host species, nutrition, and leaf chemistryLyons, Anita Marie (2008)Since European settlement, around 93% of the Western Australian wheatbelt has been cleared for agriculture, leading to a range of environmental problems, including erosion, salinity, and loss of biodiversity. Recently, ...
Viscarra Rossel, Raphael; Behrens, T.; Ben-Dor, E.; Brown, D.; Demattê, J.; Shepherd, K.; Shi, Z.; Stenberg, B.; Stevens, A.; Adamchuk, V.; Aïchi, H.; Barthès, B.; Bartholomeus, H.; Bayer, A.; Bernoux, M.; Böttcher, K.; Brodský, L.; Du, C.; Chappell, A.; Fouad, Y.; Genot, V.; Gomez, C.; Grunwald, S.; Gubler, A.; Guerrero, C.; Hedley, C.; Knadel, M.; Morrás, H.; Nocita, M.; Ramirez-Lopez, L.; Roudier, P.; Campos, E.; Sanborn, P.; Sellitto, V.; Sudduth, K.; Rawlins, B.; Walter, C.; Winowiecki, L.; Hong, S.; Ji, W. (2016)© 2016 The Authors. Soil provides ecosystem services, supports human health and habitation, stores carbon and regulates emissions of greenhouse gases. Unprecedented pressures on soil from degradation and urbanization are ...
A low-altitude mountain range as an important refugium for two narrow endemics in the Southwest Australian Floristic Region biodiversity hotspotKeppel, G.; Robinson, Todd; Wardell-Johnson, Grant; Yates, C.; Van Niel, K.; Byrne, M.; Schut, A. (2016)Background and Aims: Low-altitude mountains constitute important centres of diversity in landscapes with little topographic variation, such as the Southwest Australian Floristic Region (SWAFR). They also provide unique ...