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用密闭培养和熏蒸提取法，研究１４ Ｃ、１ ５ Ｎ 标记秸秆对红壤和变性土中原有土壤微生物量及其 Ｃ／ Ｎ 动态变化的影响。结果表明，施加秸秆可增加原有土壤微生物量，原有土壤微生物量 Ｃ和 Ｎ 在培养初期很快即达最大值，以后逐渐减少并趋于稳定。原有微生物量 Ｃ减少程度大于原有微生物量 Ｎ。虽然加入外源基质，土壤原有 Ｃ、 Ｎ仍是微生物能源和养分的主要供给者。土壤微生物量的 Ｃ／ Ｎ 值，红壤为６７２～１１０４；变性土为４７０～７３０，加入秸秆可导致这一比值降低。
Using closed culture and fumigation extraction, the effects of 14 C and 15 N labeled straw on the original soil microbial biomass and C / N dynamic changes in red soil and denudated soil were studied. The results showed that straw application increased the original soil microbial biomass. The original soil microbial biomass C and N quickly reached the maximum at the early stage of culture, then gradually decreased and stabilized. The original microbial C reduced more than the original microbial N. Although added to the exogenous matrix, the original soil C, N is still the main supplier of microbial energy and nutrients. Soil microbial biomass C / N values ranged from 672 to 1104 for red soil and from 470 to 730 for denuded soil. Adding straw could reduce this ratio.