發(fā)布時(shí)間：2019-01-10 11:38

【摘要】：生態(tài)恢復(fù)是防治土壤侵蝕、恢復(fù)地帶性植被并實(shí)現(xiàn)可持續(xù)發(fā)展的重要措施。叢枝菌根真菌能夠促進(jìn)土壤團(tuán)聚體的形成和穩(wěn)定,進(jìn)而改良土壤結(jié)構(gòu),對(duì)退化生態(tài)系統(tǒng)的恢復(fù)和重建具有重要作用。通過(guò)分析小良沿海侵蝕臺(tái)地不同恢復(fù)階段(裸地—桉樹林—闊葉混交林—次生林)土壤團(tuán)聚體組成、細(xì)根生物量、微生物群落結(jié)構(gòu)以及球囊霉素相關(guān)土壤蛋白(Glomalin-Related Soil Protein,GRSP)質(zhì)量分?jǐn)?shù)等指標(biāo),探討沿海侵蝕臺(tái)地植被恢復(fù)過(guò)程中土壤團(tuán)聚體組成及其與叢枝菌根真菌的潛在關(guān)系。結(jié)果表明,(1)隨著植被恢復(fù)的進(jìn)行,土壤大團(tuán)聚體(粒徑2 000μm)含量、土壤結(jié)構(gòu)穩(wěn)定性指數(shù)(平均質(zhì)量直徑,Mean Weight Diameter,MWD)、細(xì)根生物量、各微生物生物量以及總GRSP(Total GRSP,T-GRSP)質(zhì)量分?jǐn)?shù)均有所增加。(2)叢枝菌根真菌生物量與細(xì)根生物量、各微生物類群生物量以及T-GRSP質(zhì)量分?jǐn)?shù)間均呈顯著的正相關(guān)關(guān)系。(3)土壤中細(xì)根生物量、各微生物類群生物量以及T-GRSP質(zhì)量分?jǐn)?shù)與其MWD、大團(tuán)聚體含量呈顯著正相關(guān)關(guān)系。可見,在植被恢復(fù)過(guò)程中,叢枝菌根真菌能夠促進(jìn)大團(tuán)聚體的形成與穩(wěn)定,進(jìn)而增強(qiáng)土壤結(jié)構(gòu)穩(wěn)定性,其機(jī)制可能在于叢枝菌根真菌生物量的增加能夠促進(jìn)其分泌更多的GRSP,并提高土壤微生物量和細(xì)根生物量。
[Abstract]:Ecological restoration is an important measure to control soil erosion, restore zonal vegetation and realize sustainable development. Arbuscular mycorrhizal fungi can promote the formation and stability of soil aggregates and then improve the soil structure and play an important role in the restoration and reconstruction of degraded ecosystems. The composition of soil aggregates, fine root biomass, microbial community structure and balloon mycin associated soil protein (Glomalin-Related Soil Protein,) in different restoration stages (bare land, eucalyptus forest, broad-leaved mixed forest and secondary forest) of Xiaoliang coastal erosion platform were analyzed by means of soil aggregates, fine root biomass, microbial community structure and balloon mycin associated soil protein (Glomalin-Related Soil Protein,). The composition of soil aggregates and their potential relationship with arbuscular mycorrhizal fungi in the process of vegetation restoration in coastal eroded terraces were studied by GRSP. The results showed that: (1) with vegetation restoration, the content of large aggregates (diameter 2 000 渭 m), the soil structure stability index (, Mean Weight Diameter,MWD) and the biomass of fine roots were increased. The biomass of arbuscular mycorrhizal fungi and fine root biomass increased. There was a significant positive correlation between biomass of each microbial group and T-GRSP content. (3) Fine root biomass of soil, biomass of each microbial group and T-GRSP mass fraction were positively correlated with their MWD,. There was a significant positive correlation between the content of macroaggregates and the content of macroaggregates. It can be seen that arbuscular mycorrhizal fungi can promote the formation and stability of macroaggregates in the process of vegetation restoration, and thus enhance the stability of soil structure. The mechanism may be that the increase of biomass of arbuscular mycorrhizal fungi can promote the secretion of more GRSP, by arbuscular mycorrhizal fungi. Soil microbial biomass and fine root biomass were also increased.
【作者單位】： 中國(guó)科學(xué)院華南植物園//廣東省應(yīng)用植物學(xué)重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31270499)
【分類號(hào)】：S714

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