【摘要】：研究退化林草地不同生態(tài)恢復(fù)模式土壤活性有機(jī)碳和碳庫管理指數(shù)變化,可為評價生態(tài)恢復(fù)措施提升土壤質(zhì)量的效果,以及優(yōu)化生態(tài)恢復(fù)模式的選擇提供重要參考。結(jié)合野外調(diào)查和室內(nèi)分析法,研究了若爾蓋沙化草地不同生態(tài)恢復(fù)模式土壤有機(jī)碳組分及碳庫管理指數(shù)變化。若爾蓋沙化草地的生態(tài)恢復(fù)模式有:灌草間作模式Ⅰ(條帶狀紅柳間植草本植物,SGⅠ)、灌草間作模式Ⅱ(環(huán)狀紅柳間植草本植物,SGⅡ)、沙障+灌草模式(紅柳沙障+紅柳間植草本植物,SBSG)。結(jié)果表明,與沙化草地(DG)相比,3種恢復(fù)模式都能提高土壤有機(jī)碳及其活性組分含量。SGⅠ模式的全剖面土壤微生物量碳(MBC)、溶解性有機(jī)碳(DOC)、易氧化有機(jī)碳(EOC)、顆粒有機(jī)碳(POC)含量分別增加36.6%、139.0%、89.4%、130.9%;SGⅡ模式的分別增加2.7%、-43.9%、15.0%、49.7%;SBSG模式的分別增加82.4%、21.8%、56.2%、170.3%。表明SGⅠ與SBSG提高土壤有機(jī)碳的效應(yīng)相近,而且二者都遠(yuǎn)大于SGⅡ。3種生態(tài)恢復(fù)模式土壤活性有機(jī)碳分配比例與DG的差異表現(xiàn)不一致,顯著體現(xiàn)是SGⅠ模式土壤DOC分配比例的垂直變化出現(xiàn)分餾現(xiàn)象。3種生態(tài)恢復(fù)模式土壤碳庫管理指數(shù)(CPMI)均大于100%,能不同程度地提升土壤質(zhì)量,其效應(yīng)大小為SGⅠSGⅡSBSG。易氧化有機(jī)碳可作為反映沙化草地生態(tài)修復(fù)模式土壤質(zhì)量變化的優(yōu)選指標(biāo),CPMI也可用于表征生態(tài)恢復(fù)措施提升沙化草地土壤質(zhì)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，

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