青海省重点研发与科技成果转化项目(2019-SF-152); 国家自然科学基金项目(31971749); 青海省创新平台建设专项“青海省寒区恢复生态学重点实验室(2017-ZJ-Y20）”
1.Northwest Institute of Eco-Environment and Resources,CAS;2.Northwest Institute of Plateau Biology,CAS
the Key R&D and Transformation Projects of Qinghai Province (2019-SF-152); the Natural Science Foundation Committee of China (31971749); the Qinghai Innovation Platform Construction Project：Qinghai Provincial Key Laboratory of Restoration Ecology of Cold Area (2017-ZJ-Y20)
摘 要: 采用实时荧光定量PCR（Quantitative real-time PCR）和Illumina Miseq高通量测序技术研究了天然草地(NG)、沙化草地(DG)、草本人工草地(AG)和人工灌丛植被(AS)四种不同草地类型的表层(0~10 cm)土壤真菌群落的生物量、多样性和结构，以揭示不同人工植被恢复措施对沙化高寒草地土壤真菌群落恢复的影响及其驱动因子。结果发现：1)草地沙化显著(P<0.05)降低了真菌群落的生物量和α多样性，人工植被重建则明显促进了二者的恢复，22年后与NG无显著差异；2)草地沙化和人工植被重建均极显著(P=0.001)改变了真菌群落结构。草地沙化后，担子菌门相对丰度显著(P<0.05)下降，一些稀有真菌趋于消失，而未分类真菌门的相对丰度则显著(P<0.01)增加。经过22年的生态恢复，绝大多数真菌门的相对丰度与NG无显著差异；AG与NG的真菌群落结构比AS与NG更为相似。3)真菌群落α多样性与植被和土壤属性之间的相关关系因多样性指数的不同而异，而其群落结构与大多数植被和土壤属性极显著(P<0.01)正相关，植被和土壤属性二者结合解释了21.4%~50.0%的真菌群落结构变化。以上结果表明，人工植被重建22年后，沙化高寒草地真菌群落的多样性和相对丰度基本得以恢复，但其群落结构与天然草地的相似度仍不高，而利用草本植物进行沙化高寒草地的恢复比灌木物种更有利于土壤真菌群落结构的恢复。
Abstract：【Objective】 This study aimed to illustrate the impacts of different revegetation approaches on the resilience of soil fungal communities in desertified alpine grasslands, and to explore the main environmental factors in driving the succession of soil fungal community.【Methods】We sampled surface soils within 0-10 cm from four different types of alpine grasslands, i.e., natural grassland (NG), desertified grassland (DG), herb-based artificial grassland (AG) and shrub-based artificial grassland (AS). Fungal community biomass, α-diversity and structure were studied using qPCR and Illumina Mesiq high-throughput sequencing technologies.【Result】1) grassland desertification significantly decreased soil fungal biomass and α-diversity, which showed no significant difference among AG, AS and NG after 22-year revegetation. 2) Both desertification and artificial revegetation significantly changed the fungal community structure. The relative abundance of Basidiomycota significantly (P<0.05) decreased after desertification. Some rare fungi phyla with less than 1% relative abundance tended to disappear, while the relative abundance of unclassified fungal phyla significantly (P<0.01) increased. After 22 years of revegetation, there was no significant difference in the relative abundance of most fungal phyla among AG, AS and NG. AG and NG showed more similar fungal structure than that of AS and NG. 3) The correlations of soil fungal α-diversity with vegetation and soil properties were diversity-index-dependent, while fungal structure significantly (P<0.01) positively correlated with most of vegetation and soil properties. Importantly, vegetation and soil properties jointly explained 21.4%-50.0% of variations in soil fungal community structure.【Conclusion】These findings indicate that fungal diversity and biomass in desertified grassland almost paralleled to the undegraded level after 22 years of revegetation. Despite fungal community structure in revegetation sites was still not similar to that of natural grassland, it is more beneficial to use grassland plants than shrub species for the restoration of soil fungal community structure in the degraded alpine grassland.
wangyani, huyigang, wangzengru, liyikang, zhangzhenhua, zhouhuakun. Impacts of Artificial Revegetation on Soil Fungal Community in Desertified Alpine Grassland[J]. Acta Pedologica Sinica,,[In Press]