【摘要】 土壤活性有机碳组分是碳素周转的指示因子,能够及时地反映环境变化对土壤碳循环的影响。为探究生态恢复对湿地土壤活性碳库含量及分布的差异影响,选择巢湖湖滨自2003年退耕的森林湿地(人工林地恢复模式)和芦苇(Phragmites australis)滩地(自然湿地恢复模式)为研究对象,与荒草滩地(退耕湿地)相比较,分析土壤活性有机碳组分及碳库管理指数变化特征,包括溶解性有机碳(DOC)、微生物生物量碳(MBC)、热水溶性有机碳(HWC)、颗粒有机碳(POC)和易氧化碳(EOC)。结果表明,与荒草滩地和芦苇滩地相比,森林湿地的生态恢复模式下土壤总有机碳和各活性有机碳组分含量均为最高。在表层0-10 cm土壤中,荒草滩地和芦苇滩地的土壤EOC主要以高活性有机碳的形式存在,森林湿地则主要以低活性有机碳的形式存在;在下层10-20 cm土壤中3个类型湿地均主要以高活性有机碳的形式存在。综合分析表明,土壤MBC、HWC、EOC和POC两两之间存在极显著相关性(P<0.01),且与土壤有机碳和全氮的相关性均达到极显著水平(P<0.01),与全磷相关性不显著。此外,两种生态恢复模式下土壤碳库管理指数均大于100%。人工林地恢复模式下两层土壤中的碳库管理指数均显著高于对照和自然湿地恢复模式(P<0.05),表征人工林地恢复模式对于改善湿地土壤质量、提升土壤固碳力更有效果。更多还原

【Abstract】 Soil labile organic carbon is an indicator of carbon cycle and can timely reflect the impact of environmental change on soil carbon cycle. To explore the ecological restoration effect on the content and distribution of labile carbon pools, forested wetland(artificial restoration pattern, PL) and reed shoaly land(natural restoration pattern, RL) were selected around Chaohu Lake to compare with weed shoaly land(GL) abandoned since the year of 2003. In this work, characteristics of soil labile organic carbon fractions including dissolved organic carbon(DOC), microbial biomass carbon(MBC), hot-water soluble organic carbon(HWC),easy oxidation of carbon(EOC) and particulate organic carbon(POC) and carbon pool management index(CPMI) were analyzed.The results showed that contents of soil organic carbon(SOC) and labile fractions were the highest in PL pattern compared with GL and RL. In the surface 0–10 cm soil, EOC mainly existed in the form of high labile organic carbon(HLOC) in GL and RL, and low labile organic carbon(LLOC) form in PL. In the sub-layer of 10–20 cm soil, however, HLOC became the dominant form of EOC in all patterns. Comprehensive analysis showed that there was a strong correlation between soil MBC, HWC, EOC and POC(P<0.01),and the correlations with SOC and total nitrogen(TN) were also significant(P<0.01), but not with total phosphorus(TP). In addition,the CPMIs under the two ecological restoration patterns were higher than 100%. In PL pattern, the CPMI of the two soil depths was significantly higher than in GL and RL(P<0.05), indicating that the artificial restoration pattern was more effective in improving wetland soil quality and soil carbon sequestration.更多还原