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Microbial biomass and organic carbon stock in paddy soils in the lake Biwa basin, Japan

机译：日本湖Biwa盆地水稻土中的微生物生物量和有机碳股

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The Shiga prefectural government has been promoting environmentally conscious agriculture through a direct payment system in order to conserve water quality of the Lake Biwa, the largest lake in Japan. Furthermore, we target to halve the emission of greenhouse gasses by 2030 from the 1990 level. Therefore we have participated in the National Soil Survey Program for monitoring soil carbon content, and investigated microbial biomass carbon (Bc) and organic carbon stock in paddy soils as influenced by soil types and management practices at the long-term experimental fields for manuring and the farmers' fields designated for a monitoring purpose.The Bc values were affected by soil types and increased by organic matter applications, ranging from 200 to 1,168 mg C/kg. The Bc values in Brown Lowland soils were higher than those in Gray lowland soils. In contrast, the values of microbial biomass nitrogen (B_N) did not show any appreciable difference among the soil types. The B_c and B_N values correspondedto 1.1-5.8 and 1.7-5.1 % of the respective values of soil organic matter. Similar tendencies were also observed in the farmers' fields for monitoring, the number of the fields being about 40. The average values of soil carbon stocks for the depth of 0-30 cm in lowland soil groups ranged from 47 to 63 Mg C/ha.
机译：滋贺县政府通过直接支付系统促进了环保农业，以节约日本最大的湖泊博物馆的水质。此外，我们旨在从1990年从2030年分开2030年的温室气体排放。因此，我们参与了监测土壤碳含量的国家土壤调查计划，并在水稻土中调查的微生物生物量碳（BC）和有机碳股，并受到粪便的长期实验领域的土壤类型和管理实践的影响农民的领域指定用于监测目的。BC值受土壤类型的影响，有机质应用增加，从200至1,168mg C / kg。棕色低地土壤中的BC值高于灰色低地土壤中的价值。相反，微生物生物质氮（B_N）的值没有显示土壤类型之间的任何明显差异。 B_C和B_N值对应于土壤有机物质的相应值的1.1-5.8和1.7-5.1％。在农民领域也观察到类似的趋势，用于监测，田地的数量约为40.低地土壤群体深度为0-30厘米的土壤碳股的平均值范围为47至63毫克C / HA 。

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