若尔盖沙化草地不同生态恢复模式土壤活性有机碳及碳库管理指数变化
发布时间:2019-04-15 19:43
【摘要】:研究退化林草地不同生态恢复模式土壤活性有机碳和碳库管理指数变化,可为评价生态恢复措施提升土壤质量的效果,以及优化生态恢复模式的选择提供重要参考。结合野外调查和室内分析法,研究了若尔盖沙化草地不同生态恢复模式土壤有机碳组分及碳库管理指数变化。若尔盖沙化草地的生态恢复模式有:灌草间作模式Ⅰ(条带状红柳间植草本植物,SGⅠ)、灌草间作模式Ⅱ(环状红柳间植草本植物,SGⅡ)、沙障+灌草模式(红柳沙障+红柳间植草本植物,SBSG)。结果表明,与沙化草地(DG)相比,3种恢复模式都能提高土壤有机碳及其活性组分含量。SGⅠ模式的全剖面土壤微生物量碳(MBC)、溶解性有机碳(DOC)、易氧化有机碳(EOC)、颗粒有机碳(POC)含量分别增加36.6%、139.0%、89.4%、130.9%;SGⅡ模式的分别增加2.7%、-43.9%、15.0%、49.7%;SBSG模式的分别增加82.4%、21.8%、56.2%、170.3%。表明SGⅠ与SBSG提高土壤有机碳的效应相近,而且二者都远大于SGⅡ。3种生态恢复模式土壤活性有机碳分配比例与DG的差异表现不一致,显著体现是SGⅠ模式土壤DOC分配比例的垂直变化出现分馏现象。3种生态恢复模式土壤碳库管理指数(CPMI)均大于100%,能不同程度地提升土壤质量,其效应大小为SGⅠSGⅡSBSG。易氧化有机碳可作为反映沙化草地生态修复模式土壤质量变化的优选指标,CPMI也可用于表征生态恢复措施提升沙化草地土壤质量的效果。
[Abstract]:The study on the changes of soil active organic carbon and carbon pool management index in different ecological restoration models of degraded forest and grass can provide an important reference for evaluating the effect of ecological restoration measures to improve soil quality and optimizing the selection of ecological restoration models. Based on field investigation and indoor analysis, the changes of soil organic carbon composition and carbon pool management index in different ecological restoration models of the sandy grassland in Ruoergai were studied. The ecological restoration models of the sandy grassland in Ruoergai are as follows: shrub-grass intercropping model 鈪,
本文编号:2458437
[Abstract]:The study on the changes of soil active organic carbon and carbon pool management index in different ecological restoration models of degraded forest and grass can provide an important reference for evaluating the effect of ecological restoration measures to improve soil quality and optimizing the selection of ecological restoration models. Based on field investigation and indoor analysis, the changes of soil organic carbon composition and carbon pool management index in different ecological restoration models of the sandy grassland in Ruoergai were studied. The ecological restoration models of the sandy grassland in Ruoergai are as follows: shrub-grass intercropping model 鈪,
本文编号:2458437
本文链接:https://www.wllwen.com/yixuelunwen/dongwuyixue/2458437.html