文章摘要
姚宝辉, 王缠, 张倩, 孙小妹, 杨晶, 蔡志远, 郭怀亮, 苏军虎.甘南高寒草甸退化过程中土壤理化性质和微生物数量动态变化[J].水土保持学报,2019,33(3):138~145
甘南高寒草甸退化过程中土壤理化性质和微生物数量动态变化
Dynamic Characteristics of Soil Physicochemical Properties and Microbial Quantity During the Degradation of Gannan Alpine Meadow
投稿时间:2018-12-24  
DOI:10.13870/j.cnki.stbcxb.2019.03.021
中文关键词: 甘南退化草地  土壤理化性质  土壤微生物数量  冗余分析
英文关键词: Gannan degraded grassland  soil physical and chemical properties  soil microbial quantity  redundancy analysis
基金项目:国家自然科学基金项目(31460566,31760706);甘肃省杰出青年基金项目(1606RJDA314);甘肃农业大学"伏羲杰出人才"培育项目(Gaufx-02J03);甘肃农业大学学科建设专项(GSAU-XKJS-2018-003)
作者单位E-mail
姚宝辉1,2, 王缠1,2, 张倩1,2, 孙小妹2,3, 杨晶1,2, 蔡志远1,2, 郭怀亮1,2, 苏军虎1,2 1. 甘肃农业大学草业学院, 草业生态系统教育部重点实验室, 甘肃省草业工程实验室, 中美草地畜牧业可持续发展研究中心, 兰州 730070

2. 甘肃农业大学-新西兰梅西大学草地生物多样性研究中心
, 兰州 730070

3. 甘肃农业大学资源与环境学院
, 兰州 730070 
sujh@gsau.edu.cn 
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中文摘要:
      研究甘南高寒草甸退化草地土壤理化性质和微生物数量动态变化特征,为退化草地改良修复提供理论依据。于2017年5,7,10月分别采集极度(ED)、中度(MD)和轻度(LD)退化草地,以及未退化的对照草地(CK)土壤,测定其理化特性及微生物数量特征。结果表明:CK的土壤含水量在5,7月均显著小于LD、MD和ED的土壤含水量,而在10月显著大于LD、MD和ED的土壤含水量)随着退化程度的加剧,土壤pH逐渐增大,有机碳、全氮和全磷含量逐渐减小)土壤细菌数量对草地的退化反映更敏感,放线菌次之,真菌最小)CK和LD的土壤微生物数量随土层深度下降更为明显)冗余分析结合蒙特卡罗置换检验结果发现,各月份影响微生物数量的环境因子不同,显著影响5月微生物数量的是土壤全磷和土壤含水量,而7月除土壤pH外,其余指标均有显著影响,10月除土壤pH和土壤碳氮比外,植被盖度和生物量等均有显著影响。可见,甘南高寒草甸土壤理化特征和三大微生物数量对退化程度的响应具有季节差异,不同时期影响因素和权重需在草地管理中予以重视。
英文摘要:
      The aim of the current study was to examine the dynamic changes of soil physicochemical properties and microbial quantities, and to provide theoretical basis for the improvement and restoration of the degraded grassland in Gannan alpine meadow. The soil samples were collected from light degradation (LD), moderate degradation (MD), extreme degradation (ED) and control grassland (CK) in May, July and October, 2017, to investigate the physiochemical characteristics and the microbial quantities. The results showed that the soil water content of CK was significantly lower than that of the degraded grassland in May and July, while significantly higher than that of the degraded grassland in October. With the aggravation of degradation degree, soil pH value gradually increased, while the content of organic carbon, total nitrogen and total phosphorus gradually decreased. The number of soil bacteria was more sensitive to grassland degradation, followed by actinomycetes and fungi. The soil microbial quantities of CK and LD decreased more obviously with the increasing of soil layer depth. Redundancy analysis and the Monte Carlo permutation test showed that the environmental factors affecting soil microbial quantities were different in each month. Soil microbial quantities were significantly affected by total phosphorus and soil water content in May, while other factors except soil pH had significant effects in July. Except soil pH value and C/N, vegetation coverage, aboveground and underground biomass and other environmental factors had significant effects in October. All of the above results revealed that the responses of soil physicochemical characteristics and soil microbial quantities to grassland degradation had have seasonal variation in Gannan alpine meadow, the influencing factors and weights in different periods also needed to be paid attention to in grassland management.
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