Fütterungsbedingte mikrobielle Zusammensetzung von Rinderkot ...

6. Effect of cattle faeces with different microbial biomass content on soil properties, gaseous
emissions and plant growth 69
Table 2. Microbial biomass indices, amino sugar indices and microbial C in cattle
faeces from different feeding regimes
Microbial biomass Microbial
C N Ergosterol MurN ManN GlcN GalN C
Faeces type (mg g -1 DW) (µg g -1 DW) (mg g -1 DW)
Heifer 10 a 1.3 a 4.4 a 0.22 a 0.07 a 1.5 a 0.79 a 21 a
Low yielding 14 ab 2.0 ab 2.2 b 0.41 b 0.15 b 2.0 a 1.15 a 31 a
High yielding 18 b 3.1 b 3.8 a 0.45 b 0.09 ab 2.0 a 0.83 a 32 a
CV (±%) 22 25 23 23 49 26 29 14
DW = dry weight; MurN = muramic acid; ManN = mannosamine; GlcN = glucosamine;
GalN = galactosamine; CV = pooled coefficient of variation between feeding regimes
(cow replicates n = 6); different letters indicate a significant difference (Tukey/Kramer,
P < 0.05)
Tabelle 10 (Table 2): Microbial biomass indices, amino sugar indices and microbial C in cattle faeces from different feeding regimes
Table 3. Microbial indices in cattle faeces from different feeding regimes
Microbial Ergosterol/ Fungal C/ Fungal
biomass microbial bacterial C glucosamine/
Faeces type C/N biomass C(‰) ergosterol
Heifer 7.9 a 0.45 a 1.10 a 296 a
Low yielding 6.8 b 0.15 b 0.66 b 672 b
High yielding 5.6 c 0.27 ab 0.60 b 385 ab
CV (±%) 12 11 11 12
CV = pooled coefficient of variation between feeding regimes (cow replicates n = 6);
different letters indicate a significant difference (Tukey/Kramer, P < 0.05).
Tabelle 11 (Table 3): Microbial indices in cattle faeces from different feeding regimes
6.3.2. Effects of faeces types on soil microorganisms and grass growth
The addition of the cattle faeces to the soil significantly increased the contents of
soil microbial biomass N and fungal ergosterol (Table 4). However, increase in soil
microbial biomass C was only significant in the case of faeces from the low yielding
cows. Faeces addition increased the amounts of CO2 evolved. CO2 emission was highest
when faeces of the high yielding cows were added in comparison with the other two
faeces types (P < 0.05). The release of CO2-C from faeces was negatively correlated
with the faecal microbial biomass C/N ratio (r = -0.69; P = 0.002) and positively with
soil ergosterol (r = 0.78, P < 0.002). Addition of faeces to soil generally led to
immobilisation of inorganic N, i.e. negative net N mineralisation. N immobilisation in