桂林会仙喀斯特湿地水位梯度下不同植物群落土壤有机碳及其组分特征
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摘要
选择桂林会仙喀斯特湿地不同水位梯度下9种植物群落的土壤为研究对象,通过研究0～30 cm不同深度的土壤理化性质、土壤有机碳(SOC)、轻组有机碳(LFOC)、重组有机碳(HFOC)、易氧化有机碳(EOC)、可溶性有机碳(DOC)、颗粒有机碳(POC)、微生物生物量碳(MBC)含量等变化趋势,以揭示水位梯度下不同植物群落土壤有机碳组分的分布特征及其影响因子.结果表明:①会仙湿地土壤0～30cm LFOC、HFOC占SOC的质量分数分别为11. 10%,88. 90%,土壤轻组分分配比相对较低,重组分分配比较高;②各群落土壤DOC,EOC; POC和MBC(除铺地黍群落外)含量均随土层深度的增加而减少;与SOC含量变化趋势基本一致,各群落DOC、EOC、POC占SOC的比例随土层变化均呈减小趋势;③华克拉莎群落的SOC、LFOC、HFOC、MBC、DOC、EOC、POC含量在各土层中均为最高,且显著高于其它植物群落;④SOC、全氮(TN)与土壤有机碳各组分含量显著正相关(P <0. 01),土壤pH与LFOC、HFOC、DOC和POC显著正相关,土壤容重与LFOC、HFOC、DOC、EOC和POC显著负相关(P <0. 01),黏粒含量与LFOC、HFOC、DOC、POC和MBC显著负相关;⑤土壤全氮、砂粒含量、pH和土壤含水量对HFOC含量的主要贡献均表现为通过影响其它因子而产生的间接作用效应;土壤TN对EOC、DOC和POC含量具有较强的直接正作用效应;土壤含水量对MBC含量的直接负作用最大.土壤理化特征因子之间的相互作用共同影响着LFOC、HFOC及有机碳各组分含量的变化.
In order to reveal the effect of vegetation type and soil physicochemical properties on the distribution of soil organic carbon and its components,a field survey was carried out on nine different plant communities along a water table gradient in the Huixian wetland with samples of soil at 0-10 cm,10-20 cm,and 20-30 cm in depth. The soil organic carbon( SOC),light fraction organic carbon( LFOC),heavy fraction organic carbon( HFOC),easily oxidized organic carbon( EOC),dissolved organic carbon( DOC),particulate organic carbon( POC),and microbial biomass carbon( MBC) were measured. The correlations among soil organic carbon components and soil physicochemical properties were also examined. The results showed that: ① The average proportion of LFOC and HFOC to SOC at 0-30 cm soil depth was 11. 10% and 88. 90%,respectively. The distribution ratio of the heavy component was much higher than of the light component in soils. ② The content of SOC,DOC,EOC,POC,and MBC( except in the Panicum repens community) and the values of DOC/SOC,EOC/SOC,and POC/SOC all decreased with increase of the soil depth. ③ Among the nine different plant communities,the contents of SOC,LFOC,HFOC,MBC,DOC,EOC,and POC of Cladium chinense were significantly higher than for other communities in same soil layers. ④ There were significantly positive correlations among soil organic carbon components( SOC) and soil total nitrogen( TN). LFOC,HFOC,DOC,and POC were also positively correlated with soil pH. The soil bulk density was significantly negative correlated with LFOC,HFOC,DOC,EOC,and POC,and the content of clay was also negatively correlated with LFOC,HFOC,DOC,POC,and MBC. ⑤ Path analysis showed that TN,soil pH,soil sand content,and soil water content( SWC) has indirect effects on HFOC by influencing other soil factors. Soil TN had strong positive effects on EOC,DOC,and POC,and SWC also has the largest direct negative effect on MBC. This showed that there were close interactions between soil physicochemical properties and soil organic carbon components. This study may provide a reference base for sustainable development and scientific predictions regarding the Huixian Karst wetland.
In order to reveal the effect of vegetation type and soil physicochemical properties on the distribution of soil organic carbon and its components,a field survey was carried out on nine different plant communities along a water table gradient in the Huixian wetland with samples of soil at 0-10 cm,10-20 cm,and 20-30 cm in depth. The soil organic carbon( SOC),light fraction organic carbon( LFOC),heavy fraction organic carbon( HFOC),easily oxidized organic carbon( EOC),dissolved organic carbon( DOC),particulate organic carbon( POC),and microbial biomass carbon( MBC) were measured. The correlations among soil organic carbon components and soil physicochemical properties were also examined. The results showed that: ① The average proportion of LFOC and HFOC to SOC at 0-30 cm soil depth was 11. 10% and 88. 90%,respectively. The distribution ratio of the heavy component was much higher than of the light component in soils. ② The content of SOC,DOC,EOC,POC,and MBC( except in the Panicum repens community) and the values of DOC/SOC,EOC/SOC,and POC/SOC all decreased with increase of the soil depth. ③ Among the nine different plant communities,the contents of SOC,LFOC,HFOC,MBC,DOC,EOC,and POC of Cladium chinense were significantly higher than for other communities in same soil layers. ④ There were significantly positive correlations among soil organic carbon components( SOC) and soil total nitrogen( TN). LFOC,HFOC,DOC,and POC were also positively correlated with soil pH. The soil bulk density was significantly negative correlated with LFOC,HFOC,DOC,EOC,and POC,and the content of clay was also negatively correlated with LFOC,HFOC,DOC,POC,and MBC. ⑤ Path analysis showed that TN,soil pH,soil sand content,and soil water content( SWC) has indirect effects on HFOC by influencing other soil factors. Soil TN had strong positive effects on EOC,DOC,and POC,and SWC also has the largest direct negative effect on MBC. This showed that there were close interactions between soil physicochemical properties and soil organic carbon components. This study may provide a reference base for sustainable development and scientific predictions regarding the Huixian Karst wetland.
引文
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