摘要
生物结皮在土壤养分累积和循环中起着重要作用.本研究以黄土丘陵区浅色藻结皮、深色藻结皮、藻藓混合结皮、藓结皮、地衣结皮和普通念珠藻结皮6类典型生物结皮为对象,分析不同类型生物结皮土壤碳(C)、氮(N)、磷(P)含量及其化学计量学特征,研究不同类型生物结皮对土壤养分的影响.结果表明:不同类型生物结皮土壤C、N、P、C/N、C/P、N/P差异显著;生物结皮层C、N、P、C/N、C/P、N/P均显著高于0~10 cm土层土壤.6类生物结皮土壤C、N含量均随土层加深而下降,P含量受土层深度影响较小.对于生物结皮层,藓结皮C、N、P含量分别为27.07、2.42、0.67 g·kg^-1,显著高于其他类型生物结皮.念珠藻结皮的0~2 cm土层土壤C、N、P、C/N、C/P、N/P显著高于其他类型生物结皮.
Biological soil crusts(biocrusts)play an important role in soil nutrient accumulation and cycling.We examined the relationship between soil nutrient characters and biocrusts types,with six typical types of biocrusts in the hilly Loess Plateau region,including light cyanobacterial crust,dark cyanobacterial crust,cyanobacterial with moss crust(mixed crusts),moss crust,Diploschistes spp.crust,and Nostoc commune crust.The variations of soil carbon(C),nitrogen(N),phospho-rus(P)concentrations and stoichiometric ratios of biocrustal layer and the subsoil under different types of biocrusts were investigated.The results showed that there were significant differences in C,N,P concentrations and stoichiometric ratio among different biocrusts types.The concentrations and stoichiometric ratios of C,N,P in the biocrustal layer were significantly higher than those of 0-10 cm soil beneath biocrusts.The concentrations of C and N significantly decreased with the increases of soil depth across all the biocrusts types.P content showed no variation between soil layers.The concentrations and stoichiometric ratios of C,N,P of moss crust were significantly higher than those of other biocrusts,with C,N,and P content of 27.07,2.42 and 0.67 g·kg^-1.In soil layer of 0-2 cm,the concentrations and stoichiometric ratios of C,N,P under N.commune crust were significantly higher than those of other biocrusts.
作者
杨巧云
赵允格
包天莉
丁倩
刘广亮
YANG Qiao-yun;ZHAO Yun-ge;BAO Tian-li;DING Qian;LIU Guang-liang(College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,Shaanxi,China;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resource,Yangling 712100,Shaanxi,China;University of Chinese Academy of Sciences,Beijing 100049,China;Wuqi County Project Management Office of Returning Farmland to Forest,Wuqi 717600,Shaanxi,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2019年第8期2699-2706,共8页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(41571268,41830758)资助~~
关键词
生物结皮
化学计量特征
养分限制
碳
氮
磷
biological soil crusts
stoichiometry characteristics
nutrient limitation
carbon
nitrogen
phosphorus
