Contents Menu

Mineralization and changes in microbial biomass in water-saturated soil amended with some tropical plant residues

Soil science and plant nutrition Volume 42 Issue 3 Page 483-492
published_at 1996-09
2007020032.pdf
[fulltext] 6.01 MB
Title
Mineralization and changes in microbial biomass in water-saturated soil amended with some tropical plant residues
Creators Azmal Abul Kalam Mohammad
Creators Marumoto Takuya
Creators Shindo Haruo
Creators Nishiyama Masaya
Creator Keywords
C and N mineralization fumigation-extraction method microbial biomass tropical plant residues water-saturated soil
An incubation experiment was conducted in the laboratory at 25 and 35℃ during 56 d to analyze the mineralization patterns and the changes in microbial biomass in water-saturated soils amended with 6 types of organic materials (O.M.) including residues from 4 tropical plants. C and N mineralization in amended and non-amended soils was influenced by the temperature. A significantly positive correlation was observed between C mineralization and the amount of hexoses of the amended O.M. regardless of the period of incubation. A negative relationship between the N mineralized from amended O.M. and C/N ratios and the amounts of cellulose plus hemicellulose of the added O.M. was observed during the period of maximum mineralization on the 49th day at 25℃. The criticla C/N ratio value for N mineralization and immobilization was observed in dhaincha (15.7) and cowpea (22.0). The pattern of changes in microbial biomass C and N was almost similar at both 25 and 35℃. The amount of biomass C and N gradually increased up to a period of 28 to 42 d and thereafter decreased gradually. A significant increase in the amount of biomass C and N was observed in O.M. amended soils over the control. The contribution of rice straw and cowpea to biomass C formation was significantly larger than that of other O.M. at the end of incubation (56 d). In the case of biomass N, the contribution of rice straw was significantly larger than that of other O.M. except for azolla at 25℃ and cowpea at 35℃. The significant contribution of rice straw and cowpea to biomass formation suggests that microbial biomass remaining in soil on the 56th day had been influenced by the combination of a larger amount of cellulose plus hemicellulose and higher C/N ratio in plant residues.
Subjects
農学 ( Other)
Languages eng
Resource Type journal article
Publishers 日本土壌肥料学会
Date Issued 1996-09
File Version Version of Record
Access Rights open access
Relations
[ISSN]0038-0768
[NCID]AA00844314
[isVersionOf] [NAID]http://ci.nii.ac.jp/naid/110001718333/
[isVersionOf] [URI]http://www.blackwellpublishing.com/journal.asp?ref=0038-0768&site=1
Schools 農学部