【作者】 李志； 袁颖丹； 郭晓敏；

【Author】 Li Zhi;Yuan Yingdan;Guo Xiaomin;College of forestry,Jiangxi Agricultural University;Key Laboratory of forest cultivation,Jiangxi Province;

【机构】 江西农业大学林学院； 江西省森林培育重点实验室；

【摘要】 近年来,武功山山地草甸因游客数量的剧增,加之"帐篷节"的举办,对山地草甸干扰严重,土壤发生不同程度的退化。活性有机碳对土壤质量的变化具有较高的灵敏性,可作为土壤退化程度的灵敏性指标。在武功山不同区域以及不同干扰程度下土壤活性有机碳的分布存在着差异性,对其分析得出结论如下:(1)微生物量碳含量为最高,平均值分别为表层CK2039.71 mg/kg、轻度干扰地为1417.67 mg/kg、重度干扰地为654.07 mg/kg,亚表层分别为1234.52 mg/kg、537.05 mg/kg、272.23 mg/kg。但是相对其他活性碳,微生物量碳也是碳损失量最大的碳,其表层土壤轻度干扰相对CK碳损失率为30.50%,重度干扰相对CK碳损失率为72.06%,亚表层土壤碳损失率分别为56.50%、78.66%。而可溶性碳碳损失率分别为表层20.10%、47.74%,亚表层为39.91%、59.54%;易氧化碳碳损失率分别为表层24.66%、45.12%,亚表层为31.26%、46.28%。干扰越严重的区域,活性碳损失率也越高。(2)土壤有机碳含量与微生物量有机碳、易氧化态碳间相关性均达到极显著水平,与可溶性碳食量也达到了显著相关。说明土壤有机碳水平影响活性有机碳含量。土壤微生物量有机碳与可溶性有机碳、易氧化态碳存在极显著相关关系,而可溶性有机碳与易氧化态碳相关性不大。因此有机碳与各活性碳之间均有一定的相关关系,有机碳的变化会直接影响活性碳含量的变化,进而改变土壤碳汇与源的关系。从而对大气二氧化碳浓度产生一定的影响。(3)不同植被群落的土壤有机碳与微生物量碳、易氧化碳均达到了极显著相关,与可溶性碳达到了显著相关;可溶性碳和易氧化碳有极显著相关,而与微生物量碳没有相关性;微生物量碳与易氧化碳也没有相关性。因不同植被群落的土样差异因素很多,包括不同区域,不同植被群落,不同海拔等因素的影响,因此,活性碳含量也会有很大的差异。更多还原

【Abstract】 In recent years,Wugong Mountain because of the sharp rise in the number of tourists,and the " tent Festival" held in mountain meadow,serious interference,the occurrence of different degrees of degraded soil.Changes of soil active organic carbon in soil has higher sensitivity,therefore,it can be used as indicators of soil degradation degree.Distribution of active organic carbon in different regions of Wugong Mountain and under the different disturbance degrees are different,the conclusion are as follows:(1) Carbon content,microbial biomass is the highest,the surface average valusare CK2039.71 mg/kg,light disturbance is 1417.67 mg/kg,severe interference is 654.07 mg/kg.The subsurface are 1234.52 mg/kg,537.05 mg/kg,272.23 mg/kg.But compared with other activated carbon,microbial biomass carbon is the largest amount of carbon loss,the surface soil disturbance relative CK carbon loss rate was 30.50%,severe interference relative CK carbon loss rate was 72.06%,subsurface soil carbon loss rate is respectively 56.50%,78.66%.While the soluble carbon loss rate is respectively 20.10%,47.74%surface,sub surface is 39.91%,59.54%;easily oxidized carbon loss rate is respectively 24.66%,45.12% surface,subsurface is 31.26%,46.28%.Interference is more serious area,activated carbon loss rate is higher.(2) The correlation between soil organic carbon and microbial biomass organic carbon,readily oxidizable carbon reached extremely significant level,and soluble carbon content are also significant correlation.The active organic carbon content of soil organic carbon level.Jinding area soil microbial biomass organic carbon and dissolved organic carbon,readily oxidizable carbon had significant correlation,and dissolved organic carbon and readily oxidizable carbon less correlation.So between organic carbon and active carbon are related to the changes of organic carbon,will directly affect the carbon content,and to change the relationship between soil carbon sink and source.To have a certain impact on atmospheric carbon dioxide concentration.(4) The amount of different vegetation communities and microbial biomass carbon and soil organic carbon,readily oxidizable carbon were in significant correlation,and soluble carbon reached significant correlation;soluble carbon and carbon dioxide were significantly related,but have no correlation with microbial biomass carbon;microbial biomass carbon and readily oxidizable carbon no correlation.Factors of soil in different vegetation communities were many,including different area,different vegetation communities at different altitudes,influence factors,therefore,active carbon content will also have the very big difference.更多还原