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本文通过培养试验比较了石灰性和非石灰性土壤中,~(14)C秸秆的矿化状况。结果表明,~(14)C秸秆碳在石灰性土壤中的矿化量,仅在施用量较高时(占土重1％以上),才高于非石灰性土,而在施用量较低时(占土重0.5％以下),并不存在矿化量增高趋势。~(14)C秸秆用量与矿化量以及土壤有机质矿化量之间呈极显著的正相关。两种土壤相比,随着~(14)C秸秆用量的增加,石灰性土壤中~(14)C秸秆碳和土壤有机质矿化量增加的幅度较非石灰性土壤中的大,表明增施有机肥对非石灰性土壤有机质,特别是新鲜有机质积累的效果较石灰性土壤明显。在石灰性土壤中,~(14)C秸秆配合无机氮肥施用,无机氮促进了~(14)C秸秆碳的矿化,并且~(14)C秸秆用量大的,无机氮促进~`(14)C碳矿化作用亦较大;~(14)C秸秆用量小的,相应的促进作用亦较小。而在石灰性土壤中,加无机氮未见对~(14)C秸秆碳矿化产生影响。
In this paper, we compared the mineralization of ~ (14) C straw in calcareous and non-calcareous soils by culturing experiments. The results showed that the mineralization amount of ~ (14) C straw carbon in calcareous soil was higher than that of non-calcareous soil only when the application rate was higher (accounting for more than 1% of soil weight) (Accounting for 0.5% of soil weight below), there is no increase in the amount of mineralization trend. ~ (14) C The amount of straw and mineralization and soil organic matter mineralization showed a significant positive correlation between. Compared with the two soils, the amount of ~ (14) C straw and soil organic matter mineralization in calcareous soil increased more with non-calcareous soil than that in non-calcareous soil with the increase of ~ (14) C straw dosage The effect of organic manure on the accumulation of organic matter, especially fresh organic matter, in non-calcareous soil is more obvious than in calcareous soil. In calcareous soils, ~ (14) C straw was applied in combination with inorganic nitrogen fertilizers, inorganic nitrogen promoted the mineralization of ~ (14) C straw carbon, and the amount of ~ (14) C straw increased ) C carbon mineralization is also larger; ~ (14) C straw dosage is small, the corresponding promotion effect is also small. However, in calcareous soils, no effect of adding inorganic nitrogen on carbon mineralization of ~ (14) C straw was observed.