| 荒漠区食细菌线虫对生物土壤结皮下土壤微生物量的影响 |
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| 引用本文： | 杨航宇,刘艳梅,罗广元,刘凤莲.荒漠区食细菌线虫对生物土壤结皮下土壤微生物量的影响[J].中国沙漠,2021,41(6):120-125. |
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| 作者姓名： | 杨航宇 刘艳梅 罗广元 刘凤莲 |
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| 作者单位： | 1.甘肃林业职业技术学院，甘肃 天水 741020;2.甘肃农业大学 园林工程学院，甘肃 兰州 730070;3.天水师范学院 生物工程与技术学院，甘肃 天水 741001;4.中国科学院西北生态环境资源研究院 沙坡头沙漠试验研究站，甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金项目(41761057);盛彤笙创新基金项目(GAN-STS-2019-1);甘肃省高等学校青年博士基金项目(2021 QB-138);甘肃省自然科学基金项目(21JR7RE177) |
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| 摘 要： | 为探明荒漠区土壤食细菌线虫与生物土壤结皮下土壤微生物量的关系，以腾格里沙漠东南缘的人工植被固沙区生物土壤结皮覆盖的沙丘土壤为研究对象，采集藻-地衣结皮和藓类结皮下0—10 cm土样，并以每克土壤15、30、45、60、90、120、150条的食细菌线虫密度接种，以未接种线虫的土样为对照，经一段时间的培养后测定接种和未接种食细菌线虫土壤的微生物量碳和氮。结果表明：无论藻-地衣结皮还是藓类结皮下的土壤，每克土壤90条以内的土壤食细菌线虫均可显著提高土壤微生物量碳和氮（P<0.05），但随着土壤食细菌线虫的繁殖或过量接种，其与土壤微生物量之间呈现出由正相关性向负相关性的转变；此外，结皮类型也显著影响土壤微生物量碳和氮的含量（P<0.05），发育晚期的藓类结皮下土壤微生物量碳和氮均高于发育早期的藻-地衣结皮。因此，在腾格里沙漠人工植被固沙区藻-地衣结皮和藓类结皮下，一定密度的土壤食细菌线虫能显著提高土壤微生物量，指示适当密度的土壤食细菌线虫可促进荒漠区土壤修复和改良。
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| 关 键 词： | 荒漠区 土壤食细菌线虫 土壤微生物量 生物土壤结皮 接种密度 结皮类型 |
| 收稿时间： | 2020-02-18 |
| 修稿时间： | 2021-04-15 |
Effects of bacterial-feeding nematodes on soil microbial biomass under biocrusts in desert areas |
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| Hangyu Yang,Yanmei Liu,Guangyuan Luo,Fenglian Liu.Effects of bacterial-feeding nematodes on soil microbial biomass under biocrusts in desert areas[J].Journal of Desert Research,2021,41(6):120-125. |
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| Authors: | Hangyu Yang Yanmei Liu Guangyuan Luo Fenglian Liu |
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| Institution: | 1.Gansu Forestry Technology College，Tianshui 741020，Gansu，China;2.College of Landscape Engineering，Gansu Agricultural University，Lanzhou 730070，China;3.College of Biological Engineering and Technology，Tianshui Normal University，Tianshui 741001，Gansu，China;4.Shapotou Desert Research and Experiment Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China |
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| Abstract: | To explore the relationships between soil bacterial-feeding nematodes and soil microbial biomass under biocrusts in desert areas. Sand dune soil under biocrusts in the artificial vegetation areas at the southeast edge of Tengger desert was studied. Soil samples of 0-10 cm under cyanobacteria-lichen and moss crusts were collected. Moreover， soil bacterial-feeding nematodes with 15， 30， 45， 60， 90， 120 and 150 individuals in per gram of soil were inoculated in soil， and the soils of uninoculated bacterial-feeding nematodes were the contrasts. Soil microbial biomass carbon and nitrogen in inoculated and uninoculated bacterial-feeding nematodes were tested after a period cultured time. The result showed that soil microbial biomass carbon and nitrogen were significantly increased by soil bacterial-feeding nematodes （P<0.05） with less than 90 individuals in per gram of soil. However， soil microbial biomass carbon and nitrogen showed a change from a positive correlation to a negative correlation with the reproduction or too much inoculated density of bacterial-feeding nematodes under both cyanobacteria-lichen and moss crusts. In addition， crust types also significantly affected soil microbial biomass carbon and nitrogen （P<0.05）， which late-successional moss crusts had higher soil microbial biomass carbon and nitrogen than early-successional cyanobacteria-lichen crusts. Therefore， the certain density of soil bacterial-feeding nematodes can obviously improve soil microbial biomass in the artificial vegetation areas at the southeast edge of Tengger desert， indicating that the suitable density of soil bacterial-feeding nematodes can promote the restoration and improvement of soil in desert areas. |
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| Keywords: | desert areas soil bacterial-feeding nematodes soil microbial biomass biocrusts inoculated density crust types |
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