生物模块沙障对流动沙丘土壤微生物分布的影响

生物模块沙障是一种新型沙袋沙障,同时具备防风固沙、局部土壤改良和植被建植功能.区别于其他沙袋沙障,生物模块沙障外包装为黄麻纤维,内部除填充风沙土外,还添加了玉米芯和羊粪.为了解生物模块沙障的局部土壤改良功能,从土壤微生物角度出发,测定和研究了生物模块沙障内部及周围土壤空间内细菌、真菌、放线菌数量分布情况.结果表明:生物模块沙障内部土壤细菌、真菌、放线菌数量及三者总数量分别达到了2.41×10⁷ cfu·g^-1、4.51×10⁷ cfu·g^-1、1.19×10⁷ cfu·g^-1及8.11×10⁷ cfu·g^-1,而对照仅分别为1.56×10⁶ cfu·g^-1、3.01×10⁶ cfu·g^-1、1.26×10⁶ cfu·g^-1及5.83×10⁶ cfu·g^-1;生物模块沙障内部3种微生物及三者总数量均高于其覆盖的下方土层,下方各土层3种微生物数量均显著高于未设置沙障区;在生物模块沙障迎风侧50 cm至背风侧50 cm区域,3种微生物总数量大小顺序为沙障放置处 > 沙障背风侧20 cm处 > 沙障迎风侧20 cm处 > 沙障背风侧50 cm处 > 沙障迎风侧50 cm处,在此防护区内土壤细菌、真菌及放线菌数量平均值分别是流动沙丘的19.56、24.47、8.39倍.生物模块沙障设置5年后,其内部3种微生物数量显著高于周围土壤,说明生物模块沙障对周围土壤微生物的影响依然存在潜力.

Effect of Bio-module Sand Barrier on Distribution Characteristics of Soil Microbial in Mobile Dunes

Bio-module sand barrier was a new type sandbag barrier, it had three functions of windbreak and sand fixation, local soil improvement and vegetation establishment at the same time. Different with other sandbag barrier, its external material was jute fibre, sand soil, corn cob and sheep manure were added. To understand the function of local soil improvement of bio-module sand barrier from the angle of soil microorganisms, soil bacteria, fungi and actinomycetes number distribution in the sand barrier and around soil were determined and studied. The results showed that soil bacteria, fungi, actinomyces and total number of three in bio-module sand barrier reached 2.41×10⁷ cfu·g^-1, 4.51×10⁷ cfu·g^-1, 1.19×10⁷ cfu·g^-1 and 8.11×10⁷ cfu·g^-1 respectively, but the control were only 1.56×10⁶ cfu·g^-1、3.01×10⁶ cfu·g^-1、1.26×10⁶ cfu·g^-1 and 5.83×10⁶ cfu·g^-1; The microorganisms number of bio-module sand barrier inside soil were higher than bio-module sand barrier coverage below soil, and soil microorganisms of every layer below were higher than no bio-module sand barrier sand dunes significantly; In the range of bio-module sand barrier windward 50 cm to leeward side 50 cm, the order of the total microorganisms number was placement of the barrier>leeward side 20 cm of sand barrier>windward leeward side 20 cm of sand barrier>leeward side 50 cm of sand barrier>windward leeward side 50 cm of sand barrier, the average value of soil bacteria, fungi and actinomycetes number of this protection zone soil were 19.56, 24.47 and 8.39 times of that in mobile sand dunes. After 5 years of bio-module sand barrier set, three kinds of micro-organisms number of sand barrier inside soil were higher than its surrounding soil that illustrated bio-module sand barriers still existing potential effects on microorganisms of around bio-module sand barriers soil.