Distribution of soil carbon and microbial biomass in arable soils under different tillage regimes

• Published in: Plant and soil Vol. 338; no. 1-2; pp. 17 - 25
• Main Authors: Sun, Benhua, Hallett, Paul D, Caul, Sandra, Daniell, Tim J, Hopkins, David W
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Dordrecht Dordrecht : Springer Netherlands 2011; Springer; Springer Netherlands; Springer Nature B.V
• Subjects: Acid soils; Agrology; Agronomy. Soil science and plant productions; Animal, plant and microbial ecology; arable soils; Bacterial biomass; Biochemistry and biology; Biological and medical sciences; Biomass; Biomedical and Life Sciences; bulk density; Carbon; Carbon content; Carbon sequestration; Chemical, physicochemical, biochemical and biological properties; Community structure; conventional tillage; Cropping systems. Cultivation. Soil tillage; Cultivation; deep tillage; Dissolved organic carbon; Ecology; Fundamental and applied biological sciences. Psychology; Fungal biomass; General agronomy. Plant production; Grassland soils; Life Sciences; microbial biomass; Microbiology; minimum tillage; No-tillage; Organic matter; Organic soils; Physics, chemistry, biochemistry and biology of agricultural and forest soils; Plant Physiology; Plant Sciences; plowing; Regular Article; Scotland; Silt loam soils; Soil biochemistry; Soil microbiology; Soil microorganisms; Soil organic carbon; Soil quality; Soil science; Soil Science & Conservation; Soil sciences; Soil surfaces; Soil tillage; Soils; Tillage; Tillage regime; Tillage. Tending. Growth control; Toy industry; United Kingdom; Scotland; British Isles, Scotland; Tillage regime; Dissolved organic carbon; Bacterial biomass; Fungal biomass; Microbial Biomass; Soil organic carbon; Cultural practice; Organic carbon; Organic matter; Soil tillage; Microbial biomass; Soil management; Dissolved matter; Soils; Fungus; Tillage regimes; Arable land; Distribution; Prokaryote; Bacteria; Microorganism; Soil plant relation
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-010-0459-2

We have measured total soil organic carbon (SOC), dissolved organic carbon (DOC), and microbial lipid contents (as indices of microbial biomass and community structure), and their distributions to 60 cm depth in soils from replicated medium-term (2003-2008) experimental arable plots subject to different tillage regimes in Scotland. The treatments were zero tillage (ZT), minimum tillage (MT; cultivation to 7 cm), the conventional tillage (CT) practice of ploughing to 20 cm, and deep ploughing (DP) to 40 cm depth. In the 0-30 cm depth range, SOC content (corrected for bulk density differences between tillage treatments) was greatest under ZT and MT, but over 0-60 cm depth the SOC contents of these treatments were similar to the CT and DP treatments. DOC concentrations declined with increasing depth in ZT and MT above 20 cm, but there were no significant differences with depth in the CT and DP treatments. Beneath 20 cm, there was little change in DOC concentration with depth for all treatments, although for the MT treatment, there was less DOC beneath the depth of cultivation. The total microbial biomass decreased with increasing depth over the 0-60 cm range in the ZT and MT treatments, whereas it decreased with depth only below 30-40 cm in the CT and DP treatments. The microbial biomass was significantly different only between 0-5 cm in the ZT, CT and DP treatments, but not for other depths between all treatments. The bacterial biomass was greater in the ZT treatment than in MT, CT and DP near the soil surface, but not significantly different over the whole profile (0-60 cm). The fungal biomass decreased with depth in the ZT and MT treatments over the whole 0-60 cm depth range, whereas it decreased with depth only below 20 cm in the CT and DP treatments.