Cellulose decomposing fungi play an important role in litter decomposition and are decisive in nutrient cycling in sandy land ecosystems. Thirty-one strains were isolated to select efficient cellulose decomposers, and...Cellulose decomposing fungi play an important role in litter decomposition and are decisive in nutrient cycling in sandy land ecosystems. Thirty-one strains were isolated to select efficient cellulose decomposers, and four efficient cellulose decomposing fungi(NM3-1, NM3-2, NM3-3, and NM3-4) were screened using a CMC(carboxymethyl cellulose) carbon source in dune soil of Horqin Sandy Land. They were identified as Asperigillus calidoustus, Fusarium oxysporum, Fusarium solani, and Hypocrea lixii by r DNA-ITS molecular biological methods. Cloth decomposition rates were 15.71%, 15.89%, 17.29%, and 17.89% by the four efficient decomposers incubated for 30 days, respectively. Screening of efficient cellulose decomposers can not only increase the dune soil functional microbe bank, but can also accelerate litter decomposition and available nutrient input in the Horqin Sandy Land.展开更多
为了检验 Pinus sylvestris var.mongolica 的降级的原因，砂土， N 的叶的集中， P， K 和 C 上的种植园在这块地之间被分析并且比较成年 P。sylvestris var。从二起源(自然森林和种植园) 的蒙古人集成通信适配器树。结果显示了针有的...为了检验 Pinus sylvestris var.mongolica 的降级的原因，砂土， N 的叶的集中， P， K 和 C 上的种植园在这块地之间被分析并且比较成年 P。sylvestris var。从二起源(自然森林和种植园) 的蒙古人集成通信适配器树。结果显示了针有的那棵自然的树更低的 N， P 和 Cconcentrations，和种植园树的比那些的更高的 K 集中刺破。为种植园树针， N 的比率: P， P : K 和 N : K 在 45 岁前与树年龄增加了；但是他们不为自然的树针是清楚的。与在 Pinus spp 上报导的结论相比，我们发现叶的 N 和 P 集中在为天赋和种植园树针的最佳的范围。这结果建议 N 或 P 可能不是在为 P 的植物养分的绝对限制因素。sylvestris var。砂土上的蒙古人集成通信适配器。然而，树刺破的在天赋和种植园的叶的 K 集中比那些在 Pinus spp 上报导低得多。(】4.80 g kg^(-1)) 。N：自然的针的 P 比率在足够的范围，而是 N : 种植园针的 P 比率从足够的范围。这些结果显示比在种植园自然森林里有更好平衡的营养地位。真希望考虑 P 的叶的滋养的集中。sylvestris var。从不同起源的蒙古人集成通信适配器，它可能被结束 P 的降级现象。sylvestris var。蒙古人集成通信适配器种植园没被 N 和 P 的绝对营养素的营养缺乏导致，但是可能被另外的矿物质营养素或由 N 和 P 营养素的有效性导致。失衡的营养地位和在种植园的针的相对快的分解可能也贡献降级。展开更多
To better understand the key role of biological soil crusts(BSCs) in redistribution processes of limited water resources in semi-arid sandy ecosystems,surface runoff over BSCs in a sandy area in the southern Mu Us san...To better understand the key role of biological soil crusts(BSCs) in redistribution processes of limited water resources in semi-arid sandy ecosystems,surface runoff over BSCs in a sandy area in the southern Mu Us sandy area was observed in this study.The results indicated that runoff occurred twice among six rainfall events during the experimental period.Runoff yields varied among types of BSCs,and that they increased in the following order:light algae crusts,dark algae crusts and moss crusts.These findings showed that runoff yields were increasing with the development of BSCs.The percentage of runoff in individual rainfall events increased from light algae crusts to moss crusts,which indicated that the redistribution ratios of different types of BSCs differed.Surface runoff of BSCs may be influenced by rainfall,rain intensity,degree of water saturation of the BSCs before the rain and degree of development of BSCs.Formation of BSCs on the surface of sand dunes changed the spatial distribution pattern of water in this semi-arid sandy ecosystem,which increased the heterogeneity of resources such as water and nutrients.Therefore,making appropriate disturbances of BSCs during storm season is beneficial to maintaining the balance of natural resources in the semi-arid sandy ecosystem.展开更多
基金financially supported by the National Science and Technology Support Program (2011BAC07B02)National Natural Science Foundation of China (41401620 and 41171414)the Key Laboratory of Desert and Desertification Foundation (KLDD-2014-010) from Cold and Arid Regions Environmental and Engineering Research Institute,CAS
文摘Cellulose decomposing fungi play an important role in litter decomposition and are decisive in nutrient cycling in sandy land ecosystems. Thirty-one strains were isolated to select efficient cellulose decomposers, and four efficient cellulose decomposing fungi(NM3-1, NM3-2, NM3-3, and NM3-4) were screened using a CMC(carboxymethyl cellulose) carbon source in dune soil of Horqin Sandy Land. They were identified as Asperigillus calidoustus, Fusarium oxysporum, Fusarium solani, and Hypocrea lixii by r DNA-ITS molecular biological methods. Cloth decomposition rates were 15.71%, 15.89%, 17.29%, and 17.89% by the four efficient decomposers incubated for 30 days, respectively. Screening of efficient cellulose decomposers can not only increase the dune soil functional microbe bank, but can also accelerate litter decomposition and available nutrient input in the Horqin Sandy Land.
基金The research was supported by Innovation Research Project of Chinese Academy of Sciences (KZCX3-SW-418), and the 100 Young Researcher Project of Chinese Academy of Sciences.
文摘为了检验 Pinus sylvestris var.mongolica 的降级的原因，砂土， N 的叶的集中， P， K 和 C 上的种植园在这块地之间被分析并且比较成年 P。sylvestris var。从二起源(自然森林和种植园) 的蒙古人集成通信适配器树。结果显示了针有的那棵自然的树更低的 N， P 和 Cconcentrations，和种植园树的比那些的更高的 K 集中刺破。为种植园树针， N 的比率: P， P : K 和 N : K 在 45 岁前与树年龄增加了；但是他们不为自然的树针是清楚的。与在 Pinus spp 上报导的结论相比，我们发现叶的 N 和 P 集中在为天赋和种植园树针的最佳的范围。这结果建议 N 或 P 可能不是在为 P 的植物养分的绝对限制因素。sylvestris var。砂土上的蒙古人集成通信适配器。然而，树刺破的在天赋和种植园的叶的 K 集中比那些在 Pinus spp 上报导低得多。(】4.80 g kg^(-1)) 。N：自然的针的 P 比率在足够的范围，而是 N : 种植园针的 P 比率从足够的范围。这些结果显示比在种植园自然森林里有更好平衡的营养地位。真希望考虑 P 的叶的滋养的集中。sylvestris var。从不同起源的蒙古人集成通信适配器，它可能被结束 P 的降级现象。sylvestris var。蒙古人集成通信适配器种植园没被 N 和 P 的绝对营养素的营养缺乏导致，但是可能被另外的矿物质营养素或由 N 和 P 营养素的有效性导致。失衡的营养地位和在种植园的针的相对快的分解可能也贡献降级。
基金P.S.-A.was funded by the Regional Council of Education,University and Professional Training(Conselleria de Educacion,Universidade e Formacion Profesional)from the Government of Galicia(Xunta de Galicia)through the annual Postdoctoral Plan'Axudas de apoio a etapa de formacion posdoutoral nas universidades doSistema universitario de Galicia'(grant ref.ED481B-2019-088)L.G.was funded by Xunta de Galicia,Spain(CITACA Strategic Partnership,grantref.:ED431E2018/07).
基金supported by the National Natural Science Foundation of China (401171002)the Fundamental Research Funds for Central Universities
文摘To better understand the key role of biological soil crusts(BSCs) in redistribution processes of limited water resources in semi-arid sandy ecosystems,surface runoff over BSCs in a sandy area in the southern Mu Us sandy area was observed in this study.The results indicated that runoff occurred twice among six rainfall events during the experimental period.Runoff yields varied among types of BSCs,and that they increased in the following order:light algae crusts,dark algae crusts and moss crusts.These findings showed that runoff yields were increasing with the development of BSCs.The percentage of runoff in individual rainfall events increased from light algae crusts to moss crusts,which indicated that the redistribution ratios of different types of BSCs differed.Surface runoff of BSCs may be influenced by rainfall,rain intensity,degree of water saturation of the BSCs before the rain and degree of development of BSCs.Formation of BSCs on the surface of sand dunes changed the spatial distribution pattern of water in this semi-arid sandy ecosystem,which increased the heterogeneity of resources such as water and nutrients.Therefore,making appropriate disturbances of BSCs during storm season is beneficial to maintaining the balance of natural resources in the semi-arid sandy ecosystem.
