关键词：
尕海;湿地;退化;土壤微生物生物量;动态变化
摘 要：
【目的】为尕海湿地的生态恢复建设和保护利用提供理论依据.【方法】以甘南尕海则岔自然保护区内的未退化、轻度退化、中度退化及重度退化的湿地为研究对象,采取生态学原理和室外采样与室内研究相联合的方法,研究2014年5~9月尕海湿地退化过程中土壤微生物生物量碳(SMB-C)、氮(SMB-N)的动态变化特性.【结果】2014年5~9月SMB-C的整体趋向为:未退化(685.12 mg/kg)>轻度退化(592.60mg/kg)>中度退化(509.61mg/kg)>重度退化(425.71mg/kg),2014年5~9月SMB-N的整体趋向为:未退化(128.68mg/kg)>轻度退化(108.70mg/kg)>中度退化(94.00mg/kg)>重度退化(77.29mg/kg).0~40cm,轻度、中度、重度退化的湿地SMB-C和SMB-N与未退化湿地之间差异显著(P<0.05).2014年5~9月SMB-C和SMB-N总含量表现为:0~10cm>10~20cm>20~40cm.10~20cm和20~40cm的SMB-C是0~10cm的79.11%和59.47%,10~20cm和20~40cm的SMB-N是0~10cm的77.14%和56.50%.0~10cm、10~20cm和20~40cm,年内月间SMB-N含量差异显著(P<0.05).2014年5~9月尕海湿地SMB-C和SMB-N随季节变化规律表现为:7月SMB-C和SMB-N含量最高,下来是6、8月SMB-C和SMB-N含量,最后是5、9月SMB-C和SMB-N含量.【结论】随着退化程度的加剧,SMB-C和SMB-N含量逐渐减少;随土层深度的加深,SMB-C和SMB-N含量逐渐降低;2014年5~9月尕海湿地SMB-C和SMB-N随季节变化呈先升后降的趋势.
译 名：
Dynamic changes of soil microbial biomass C and N during degradation process of the wetland in Gahai
作 者：
WANG Qi;WANG Li;MA Wei-wei;LIU Ke-hong;College of Forestry,Gansu Agricultural University;
关键词：
Gahai;;wetland;;degradation;;soil microbial biomass;;dynamic variations
摘 要：
【Objective】To provide a theoretical basis for the construction of ecological restoration and protection of the wetland in Gahai.【Method】The dynamic changes of soil microbial biomass C(SMB-C)and N(SMB-N)during degradation process of the wetland in May to September 2014 were studied by using the principle of ecology and method of combination field survey with laboratory analysis,the wetlands of non-degradation,mild degeneration,moderate degradation and severe degeneration were chosen to be the study subjects in Gahai of Zecha natural preservation zone of Gannan.【Result】The overall trend of soil microbial biomass C in May to September of 2014 showed as:non-degradation(685.12mg/kg)>mild degra-dation(592.60mg/kg)>moderate degeneration(509.61mg/kg)>severe degeneration(425.71mg/kg).The overall trend of soil microbial biomass N in May to September of 2014 showed as:non-degradation(128.68mg/kg)>mild degradation(108.70mg/kg)>moderate degeneration(94.00mg/kg)>severe degeneration(77.29mg/kg).The differences of soil microbial biomass C and N of 0~40cm among non-degradation,mild degradation,moderate degeneration and severe degeneration were significant.The total content of soil microbial biomass C and N in May to September of 2014 showed as:0~10cm>10~20cm>20~40cm.Soil microbial biomass C of 10~20cm and 20~40cm were 79.11% and 59.47% of 0~10cm.Soil microbial biomass N of 10~20cm and 20~40cm were 77.14%and 56.50% of 0~10cm.The differences of soil microbial biomass C and N were significant among 0~10cm,10~20cm and 20~40cm in months of the years.During May to September of 2014,the monthly average content of soil microbial biomass C and N changed with the seasons,the highest in July,then in June and August,and the lowest in September and May.【Conclusion】Along with the aggravation of wetland degradation,soil microbial biomass C and N decreased gradually.Soil microbial biomass C and N decreased with the increasing of soil depth.During May to September of 2014,the monthly average content of soil microbial biomass C and N in Gahai wetland with the seasons change law showed an"up-down"trend.
