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.
[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 u- sing 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 cff Zecha natural preservation zone of Gannan. [Resultl The overall trend of soil microbial biomass C in May to September of 2014 showed as： non-degradation （685.12 mg/kg））mild degra-dation （592. 60 mg/kg）〉moderate degeneration （509. 61 mg/kg）〉severe degeneration （425.71 mg/kg）. The overall trend of soil microbial biomass N in May to September of 2014 showed as： non-degradation （128. 68 mg/kg）〉mild degradation （108. 70 mg/kg）〉moderate degeneration （94.00 mg/kg）〉severe de- generation （77. 29 mg/kg）. The differences of soil microbial biomass C and N of 0~40 cm among non-degradation,mild degradation,moderate degeneration and severe degeneration were significant. The total con- tent of soil microbial biomass C and N in May to September of 2014 showed as：0-10 cm〉10-20 cm〉20 -40 era. Soil microbial biomass C of 10-20 cm and 20-40 cm were 79.11% and 59.47% of 0-10 cm. Soil microbial biomass N of 10-20 cm and 20-40 cm were 77.14% and 56. 50% of 0-10 cm. The differences of soil microbial biomass C and N were significant among 0-10 cm, 10-20 cm and 20-40 cm 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 bio- mass 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.
作者
王淇
王立
马维伟
刘克宏
WANG Qi WANG Li MA Wei-wei LIU Ke-hong(College of Forestry,Gansu Agricultural University,Lanzhou 730070,Chin)
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2017年第4期103-109,共7页
Journal of Gansu Agricultural University
基金
国家自然科学基金项目(31260155
41561022)
高等学校博士学科点专项科研基金资助项目(20126202110006)
甘肃省科技厅项目(1308RJZA256)
甘肃省学校科研项目(2015A-067)
甘肃省自然科学基金项目(1506RJZA015)
甘肃农业大学林学院中青年科技基金资助项目
关键词
尕海
湿地
退化
土壤微生物生物量
动态变化
Gahai
wetland
degradation
soil microbial biomass
dynamic variations
