Measurement of soil microbial biomass provides an early indication of changes in total soil organic matter due to straw incorporation.

A - Papers appearing in refereed journals

Powlson, D. S., Brookes, P. C. and Christensen, B. T. 1987. Measurement of soil microbial biomass provides an early indication of changes in total soil organic matter due to straw incorporation. Soil Biology and Biochemistry. 19 (2), pp. 159-164.

AuthorsPowlson, D. S., Brookes, P. C. and Christensen, B. T.
Abstract

The straw and stubble of spring barley (Hordeum vulgare; 5t dry matter ha−1) were either burned or incorporated into soil annually for 18 yr in two field experiments in Denmark. Both experiments were on light soils situated at Studsgaard (loamy sand) and Rønhave (sandy loam). At both sites 18 yr of annual straw incorporation increased total soil organic C by only 5% and total N by about 10% but produced large increases in microbial biomass measured by the CHCl3-fumigation method. The increases in biomass C were 45 and 37% at Studsgaard and Rønhave, respectively: the corresponding increases in biomass N were 50 and 46%. Biomass measurements thus gave an early indication of slow changes in organic matter content long before these could be measured accurately against the background of organic matter already present in the soils. Increases in biomass P due to straw incorporation appeared to be even greater. However, the amounts of P released by CHC13 were small so the measurements of biomass P were less accurate than those of biomass C or N. During a 60-day laboratory incubation at 25°C, evolution of CO2-C was 55–79% greater in soil from straw incorporated plots than in soil from burned plots. Mineralization of N was 40–50% greater where straw had been incorporated, indicating thaf the long-term incorporation of straw had increased the quantity of mineralizable N in soil.

KeywordsRRES175; 175_Soil science
Year of Publication1987
JournalSoil Biology and Biochemistry
Journal citation19 (2), pp. 159-164
Digital Object Identifier (DOI)doi:10.1016/0038-0717(87)90076-9
Open accessPublished as non-open access
Publication process dates
Accepted01 Sep 1986
Copyright licensePublisher copyright
PublisherElsevier
ISSN0038-0717

Permalink - https://repository.rothamsted.ac.uk/item/8606v/measurement-of-soil-microbial-biomass-provides-an-early-indication-of-changes-in-total-soil-organic-matter-due-to-straw-incorporation

Restricted files

Publisher's version

Under embargo indefinitely

12 total views
1 total downloads
4 views this month
0 downloads this month