草业学报2017，Vol.26Issue(12)：1-12,12.DOI:10.11686/cyxb2017090
不同退化程度人工梭梭林对土壤理化性质与生物学特性的影响
Physicochemical and biological properties of soil in Haloxylon ammodendron plantations with different states of degradation
摘要
Abstract
Haloxylon ammodendron was introduced to the Minqin region from Xinjiang province in the 1960s.It became the primary species for windbreak and sand stabilization planting.The area in H.ammodendron plantation forest in Minqin County is about 3.5 × 104 ha,51.5％ of the total plantation forest area.Degradation H.am modendron forest had been observed since the 1970s,seriously threatening the survival and development of the Minqin Oasis.The aim of this study was to investigate the physicochemical and biological properties of soil under H.ammodendron forests with different degradation states in the Minqin oasis-desert ecotone,Gansu.12 plots were selected in the degradation gradient;soil samples were collected from 0-5 cm,5-10 cm,10-20 cm depths from a representative area in each plot.Each plot was assigned (using vegetation indices) to one of four degradation grades (no degradation,light degradation,moderate degradation and severe degradation) using hierarchical cluster analysis.The soil physicochemical properties,microbial number,and enzyme activities were analysed.The effect of degradation of H.ammodendron forest on soil bulk density,total salt content,cation exchange capacity was not obvious,but soil organic gradually decreased and pH changed complexly with increasing degradation and increasing of soil depth.The total number of microbes and microbe species decreased with increasing soil depth;numbers of bacteria were much higher than actinomycetes in 0-5 cm soil depth,but they were similar in deeper soil layers.Fungi were not prevalent in any soil layers.Increased degradation was not associated with changes in the number of fungi observed.Enzyme activity decreased with increasing soil depth with increased degradation.The impact of degradation of H.ammodendron forest on protease activity,catalase activity,urease activity was greater than for invertase activity,the former showed greater sensitivity to changes in resources and environment.There were strong correlations among soil physicochemical properties,number of soil microbes and soil enzyme activities,but the correlation among soil physicochemical indicators,between soil bulk density,number of actinomycetes and other indicators were not significant.Soil fertility and biological properties in degraded H.ammodendron plantations have declined;restoration of the soil is necessary for restoration of these forests.关键词
人工梭梭林/退化/理化性质/土壤微生物/土壤酶Key words
artificial Haloxylon ammodendron forest/degradation/physicochemical properties/soil microbes/soil enzyme引用本文复制引用
刘江,徐先英,张荣娟,崔文天,赵鹏,丁爱强,付贵全..不同退化程度人工梭梭林对土壤理化性质与生物学特性的影响[J].草业学报,2017,26(12):1-12,12.基金项目
国家科技支撑计划项目(2012BAD16B0203),国家重点基础研究发展计划(2012CB723203),国家自然科学基金(41161006)和甘肃省科技计划资助项目(1606RJYA311)资助. （2012BAD16B0203）
