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为了解毛竹林地表覆盖后翻耕对土壤总有机碳及土壤活性有机碳含量的影响,以浙江省台州市黄岩区山地毛竹林为研究对象,对连续覆盖2年翻耕,连续覆盖2年未翻耕和自然生长样地(对照)3种不同管理方式下地表覆盖的毛竹林0~50 cm土层土壤有机碳含量进行了比较。结果表明:覆盖2年未翻耕处理和覆盖2年翻耕处理0~50 cm各土层土壤总有机碳含量比对照样地分别增加了8.7%~43.8%和22.2%~90.8%;土壤轻组有机质含量较对照分别增加了13.2%~111.0%和36.7%~238.5%;覆盖2年翻耕处理和对照样地相比,0~50 cm各土层土壤易氧化碳含量分别增加了21.9%~97.5%,而覆盖2年未翻耕处理下的土壤易氧化碳含量0~20 cm土层较对照样地增加明显,20~50 cm土层则有减少的趋势;3种处理下的土壤水溶性有机碳含量,除10~20 cm土层差异性显著外,其余的土层变化都不明显;对照样地土壤水溶性有机碳占总有机碳的比率高于覆盖2年处理的毛竹林地,而易氧化碳占总有机碳的比率则表现为0~20 cm土层覆盖2年未翻耕>覆盖2年翻耕>对照样地,20~50 cm土层对照样地>覆盖2年翻耕>覆盖2年未翻耕;3种处理下土壤各活性有机碳与土壤总有机碳的相关性均达到极显著水平;3种处理方式下,土壤有机碳、水溶性有机碳、易氧化碳和轻组有机质与土壤养分(全氮、水解氮、有效磷、速效钾、交换性钙、交换性镁)的相关性均达到显著(P<0.05)或极显著(P<0.01)水平。
In order to understand the effect of tillage on total soil organic carbon and soil active organic carbon content after surface mulching, the paper studied the effects of tillage on the soil organic carbon content and soil active organic carbon content in the shady bamboo forest in Huangyan District, Taizhou, Zhejiang Province. Tillage and natural growing plot (control), soil organic carbon content in 0 ~ 50 cm soil layer of surface mulched bamboo under three different management modes were compared. The results showed that soil total organic carbon content increased by 8.7% -43.8% and 22.2% -90.8% respectively over the two years of untreated and two-year plowed 0-50 cm soil layers. Soil light Compared with the control, the content of organic matter in soil increased by 13.2% ~ 111.0% and 36.7% ~ 238.5%, respectively. Compared with the control plots, the content of soil vulnerable carbon increased by 21.9% ~ 97.5%, while the 0 ~ 20 cm soil layer of 0 ~ 20 cm soil layer under two years untreated treatment increased significantly compared with the control sample, while the soil layer at 20 ~ 50 cm decreased. Soil under the three treatments The contents of soil water-soluble organic carbon in total soil organic carbon in the control plot were higher than those in the two-year-old bamboo forest, except for the significant difference in 10-20 cm soil layer , And the ratio of readily oxidizable carbon to total organic carbon showed 0-20 cm soil layer covering two years of untreated soil> coverage of two years of tillage> control plots, 20-50 cm soil layer plots> covering two years Tillage> covering two years without tillage; correlations between soil active organic carbon and soil total organic carbon under the three treatments reached extremely significant levels; under the three treatments, soil The correlations between soil organic carbon (N, N, available P, available K, exchangeable Ca and exchangeable Mg) were all significantly higher than those of organic carbon, water soluble organic carbon, Or extremely significant (P <0.01) levels.