Soil microbial biomass and mineralization of carbon and nitrogen in ecological, integrated and conventional forage and arable cropping systems

被引:52
作者
Breland, TA
Eltun, R
机构
[1] Agr Univ Norway, Dept Chem & Biotechnol, N-1432 As, Norway
[2] Norwegian Crop Res Inst, Apelsvoll Res Ctr, N-2848 Kapp, Norway
关键词
cropping systems; microbial biomass; carbon mineralization; nitrogen mineralization; conceptual humus fractions;
D O I
10.1007/s003740050608
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
In a cropping systems experiment in southeastern Norway, ecological (ECO), integrated (INT) and conventional (CON) forage (FORAGE) and arable (ARABLE) model farms were compared. After 5 experimental years, topsoil was sampled in spring from spring grain plots and incubated for 449 days at controlled temperature (15 degrees C) and moisture content (50% water-holding capacity). There were no detectable differences between model farms in terms of total soil C or N. For INT and CON, however, values of microbial biomass C and N, microbial quotient (C-mic/C-org), and C and N mineralization were, or tended to be, higher for FORAGE than for ARABLE. For the ECO treatment, values were similar for FORAGE and ARABLE and did not differ. significantly from that of CON-FORAGE. For INT and CON, the metabolic quotient (qCO(2)) was lower for FORAGE than for ARABLE. Again, for the ECO treatment, values were similar for FORAGE and ARABLE and did not differ significantly from that of CON-FORAGE. We estimated the sizes of conceptual soil organic matter pools by fitting a decomposition model to biomass and mineralization data. This resulted in a 48% larger estimate for CON-FORAGE than for CON-ARABLE of physically protected biomass C. For physically protected organic C the difference was 42%. Moreover, the stability of soil aggregates against artificial rainfall was substantially greater for CON-FORAGE than for CON-ARABLE. On this basis, we hypothesized that the lower qCO(2) values in the FORAGE soils were mainly caused by a smaller proportion of active biomass due to enclosure of microorganisms within aggregates. Altogether, our results indicated a poorer inherent soil fertility in ARABLE than in FORAGE rotations, but the difference was small or absent in the ECO system, probably owing to the use of animal and green manures and reduced tillage intensity in the ECO-ARABLE rotation.
引用
收藏
页码:193 / 201
页数:9
相关论文
共 40 条
[1]  
Altieri M., 2018, AGROECOLOGY SCI SUST
[2]  
ANDERSON TH, 1994, BEYOND THE BIOMASS, P67
[3]   APPLICATION OF ECOPHYSIOLOGICAL QUOTIENTS (QCO2 AND QD) ON MICROBIAL BIOMASSES FROM SOILS OF DIFFERENT CROPPING HISTORIES [J].
ANDERSON, TH ;
DOMSCH, KH .
SOIL BIOLOGY & BIOCHEMISTRY, 1990, 22 (02) :251-255
[4]   Fate of carbon and nitrogen in water-stable aggregates during decomposition of (CN)-C-13-N-15-labelled wheat straw in situ [J].
Angers, DA ;
Recous, S ;
Aita, C .
EUROPEAN JOURNAL OF SOIL SCIENCE, 1997, 48 (02) :295-300
[5]  
[Anonymous], W EUROPEAN METHODS S
[6]   Green manuring with clover and ryegrass catch crops undersown in small grains: Effects on soil mineral nitrogen in field and laboratory experiments [J].
Breland, TA .
ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE, 1996, 46 (03) :178-185
[7]   Green manuring with clover and ryegrass catch crops undersown in spring wheat: Effects on soil structure [J].
Breland, TA .
SOIL USE AND MANAGEMENT, 1995, 11 (04) :163-167
[8]   Modelling mineralization of plant residues on soil: effect of physical protection [J].
Breland, TA .
BIOLOGY AND FERTILITY OF SOILS, 1997, 25 (03) :233-239
[9]   CHLOROFORM FUMIGATION AND THE RELEASE OF SOIL-NITROGEN - A RAPID DIRECT EXTRACTION METHOD TO MEASURE MICROBIAL BIOMASS NITROGEN IN SOIL [J].
BROOKES, PC ;
LANDMAN, A ;
PRUDEN, G ;
JENKINSON, DS .
SOIL BIOLOGY & BIOCHEMISTRY, 1985, 17 (06) :837-842
[10]   THE MICROBIOLOGY OF SOIL STRUCTURE [J].
BURNS, RG ;
DAVIES, JA .
BIOLOGICAL AGRICULTURE & HORTICULTURE, 1986, 3 (2-3) :95-113