浙江农业学报

• 环境科学 • 上一篇    下一篇

放牧与围栏对荒漠草原土壤养分及酶活性的影响

  

  1. (1.宁夏大学 西北退化生态系统恢复与重建教育部重点实验室,宁夏 银川 750021; 2.宁夏大学 西北土地退化与生态恢复省部共建国家重点实验室培育基地,宁夏 银川 750021; 3.宁夏大学 西部生态与生物资源开发联合研究中心,宁夏 银川 750021; 4.宁夏大学 科学技术处,宁夏 银川 750021)
  • 出版日期:2016-08-25 发布日期:2016-08-04

Effects of grazing and fencing on nutrients and enzyme activities in desert steppe soil

  1. (1. Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in NorthWestern China, Ministry of Education, Ningxia University, Yinchuan 750021, China; 2. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration of NorthWestern China, Ningxia University, Yinchuan 750021, China; 3. Union Research Center for Ecological and Exploitation of Biological Resources in Western China, Ningxia University, Yinchuan 750021, China; 4. Science and Technology Department of Ningxia University, Yinchuan 750021, China)
  • Online:2016-08-25 Published:2016-08-04

摘要: 以宁夏毛乌素沙地荒漠草原蒙古冰草(Agropyron mongolicum)、甘草(Glycyrrhiza uralensis)、赖草(Leymus secalinus)群落为研究对象,探讨放牧与围栏对不同植被群落土壤养分和酶活性的影响。结果表明,在放牧干扰下,甘草群落土壤有机碳(soil organic carbon,SOC)显著降低;3种植被群落土壤总磷(total phosphorus,TP)均显著升高;甘草与赖草群落土壤总氮(total nitrogen,TN)含量亦显著上升。从土壤酶活性变化来看,放牧条件下,赖草群落土壤碱性磷酸酶活性显著上升;蒙古冰草群落土壤脲酶活性显著下降,而甘草群落土壤脲酶活性显著上升;蒙古冰草与甘草群落土壤过氧化氢酶活性均显著下降。整体来看,不同植被群落土壤4种酶活性与土壤养分间均表现出一定的相关性。放牧与围栏对荒漠草原不同植被类型群落土壤养分的影响表现出差异性,应根据群落特性,有针对性地制定合理的放牧制度,以利于植被恢复及保持土壤肥力。

关键词: 荒漠草原, 放牧, 围栏, 土壤养分, 土壤酶

Abstract: In order to study the effects of grazing and fencing on soil nutrients and enzyme activities of different vegetation communities, Agropyron mongolicum, Glycyrrhiza uralensis, Leymus secalinus were selected as study objects. It was shown that under grazing disturbance, soil organic carbon (SOC) content significantly decreased in Glycyrrhiza uralensis land. Soil total phosphorus (TP) content in the 3 tested vegetation communities significantly increased under grazing treatment. Soil total nitrogen (TN) in Glycyrrhiza uralensis and Leymus secalinus land was also significantly increased. After grazing, soil alkaline phosphatase activity in Leymus secalinus land was significantly enhanced. Soil urease activity was significantly reduced in Agropyron mongolicum land, yet was significantly enhanced in Glycyrrhiza uralensis land under grazing. Under grazing treatment, soil catalase activity in Agropyron mongolicum and Glycyrrhiza uralensis land was significantly reduced. Overall, soil enzyme activities were correlated with soil nutrients. In conclusion, different vegetation community showed varied response to grazing and fencing treatment. Thus, different grazing intensities should be arranged for different vegetation community, in order to achieve vegetation restoration and soil fertility maintenance.

Key words: desert steppe, grazing, fencing, soil nutrient, soil enzyme