Most significant difference in soil microbial biomass C and N was in summer when microbial biomass C and N were 1.70 g/kg and 0.26g/kg in the NF,1.25 g/kg and 0.20g/kg in the CK and 1.14g/kg and 0.17g/kg in the CF respectively.
The results showed that the vertical distribution of total soil microbial biomass in both degenerated and recovered grasslands was in order of 0～10>10～20>20～30>30～40>40～50 cm,which decreased with soil depths.
(2) Soil microbial biomass decreased with increasing soil depth and was significantly different at 0-10cm layer for three forests. Microbial biomass C and N at top 10cm soil in the NF were 1.46 and 1.57 times higher than those in the CK respectively, and 1.83 and 1.84 times higher than in the CF respectively.
Most significant difference in soil microbial biomass C and N was in summer when microbial biomass C and N were 1.70 g/kg and 0.26g/kg in the NF,1.25 g/kg and 0.20g/kg in the CK and 1.14g/kg and 0.17g/kg in the CF respectively.
The results showed that the vertical distribution of total soil microbial biomass in both degenerated and recovered grasslands was in order of 0～10>10～20>20～30>30～40>40～50 cm,which decreased with soil depths.
The amounts of the microbial biomass C,N and P in the soils accounted,in averages,for 2.9%,3.6%, and 2.1% of total organic C, N and P. These percentages were little affected by the application of the fertilizers.
0～10 cm soil cultivated as paddy field for 30 years has a 332.8 mg kg -1 of microbial biomass C and 23.85 mg kg -1 microbial biomass N, which were 111% and 47% higher than that for paddy field cultivated for 3 years.
The biomass of soil microorganisms of soybean follows soybean or follows next crope was in-vestigated from 1992 to 1993. The results shows as: difference of biomass of soil microorganismsis index obvious in flowering stage and is much more in soybean rotation than that of soybean fol-lows soybean or follows next crope.
On the analysis of soil microbe biomass and its' distribution in the Pinus tabulaeformis and Quercus aliena var. acuteserata stands, the results show that soil microbe biomass in the Pinus tabulaeformis and Quercus aliena var. acuteserata stands does obvious decrease from the above layer to the below layer in the profile and concentrates on the layers 0 ~ 20 cm.
And the relationships between the soil microbe biomass and organic matter contents, porosity, tiny root (living and death) biomass are positive, but soil unit weight is negative.
Lastly the soil microbe biomass among the layers 0 ~ 30 cm in the Quercus aliena var. acuteserata, Pinus tabulaeformis stands and grassland, i.e.C mic are 565.87,502.64 and 292.25 mg/kg respectively, and N mic are 89.48, 79.34 and 46.38 mg/kg respectively, and puts in order: Quercus aliena var. acuteserata stand> Pinus tabulaeformis stand>grassland among the different plantations.
The soil microbial biomass and nutrient status under the native broadleaved forest and Cunninghamia lanceolata plantations at the Huitong National Research Station of Forest Ecosystem (in Hunan Province, midland of China) were examined in this study.
Less litter and slower decay rate in pure Chinese fir plantation were the crucial factors leading to the decrease of soil microbial biomass and nutrient pool in this area.
The soil microbial biomass and nutrient status under the native broadleaved forest and Cunninghamia lanceolata plantations at the Huitong National Research Station of Forest Ecosystem (in Hunan Province, midland of China) were examined in this study.
Less litter and slower decay rate in pure Chinese fir plantation were the crucial factors leading to the decrease of soil microbial biomass and nutrient pool in this area.
土壤微生物生物量
soil microbial biomass
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