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何芳兰,金红喜,郭春秀,吴昊,刘左军,徐文.民勤绿洲边缘沙丘生物土壤结皮形成对浅层土壤粒度、养分及微生物含量的影响.生态学报,2017,(18).http://dx.doi.org/10.5846/stxb201606281277  
民勤绿洲边缘沙丘生物土壤结皮形成对浅层土壤粒度、养分及微生物含量的影响
Effect of biological soil crust forming on soil particle,nutrient and microorganism of dune surface in the edge of Minqin oasis
投稿时间:2016-06-28  最后修改时间:2017-04-11
DOI: 10.5846/stxb201606281277
关键词民勤绿洲  生物土壤结皮  土壤粒度  养分
Key WordsMinqin oasis  Biological soil crust  Soil particle size  Nutrient  Microoganism
基金项目国家自然科学基金项目(31360203);甘肃省创新群体项目(145RJIA335)
作者单位E-mail
何芳兰 甘肃省治沙研究所 甘肃河西走廊森林生态系统国家定位观测研究站 hefanglan2003@126.com 
金红喜 甘肃省治沙研究所 甘肃河西走廊森林生态系统国家定位观测研究站  
郭春秀 甘肃省治沙研究所 甘肃河西走廊森林生态系统国家定位观测研究站  
吴昊 甘肃省治沙研究所 甘肃河西走廊森林生态系统国家定位观测研究站  
刘左军 兰州理工大学生命科学与工程学院  
徐文 兰州理工大学生命科学与工程学院  
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摘要:
为探明干旱沙区沙丘生物土壤结皮形成及发育对浅层土壤粒度、养分及微生物的影响,以民勤绿洲边缘土壤结皮形成发育不同阶段(NCS、PACS、ALCS、LMCS)的0-1cm层土壤为研究对象,研究了其土壤颗粒组成、养分及微生物量动态变化。结果表明:1)生物土壤结皮由NCS向ALCS的发育有效地提高了土壤细沙粒(0-200μm)含量,同时降低了粗砂粒(200-2000μm)含量;在ALCS向LMCS 阶段演替过程中土壤粒度组成基本没变化。2)土壤结皮形成与发育对土壤有机质、全氮、速效磷以及速效钾含量均有显著影响(P<0.05),且这4种土壤养分含量均随生物结皮演替逐渐增大。3)在整个土壤结皮形成与演替过程中,土壤细菌、放线菌以及真菌数量均呈现出先增大后减小趋势,且峰值均出现在PACS;土壤总藻生物量一直处于持续增大趋势;在5-12月期间,土壤微生物数量或生物量变化均呈现出先增大后减小趋势。4)NCS向PACS演替过程中,土壤颗粒组成变化改变是土壤微生物量及养分变化的主要驱动因子;在PACS向 LMCS演替过程中,土壤藻类、地衣、藓类是提高土壤养分含量的主要因子。这说明民勤绿洲边缘沙丘生物土壤结皮形成与发育能有效地改善了该区域浅层土壤质量,提高了土壤肥力,同时对土壤生态系统改善及生态环境保具有极其重要的作用。
Abstract:
In order to ascertain whether or not the formation and development of dune biological soil crust affect soil particles, nutrient and microorganism, the dynamic changes of soil particle composition, soil nutient content and microbial amount of 0-1cm soil layer of dunes including no crust stage (NCS), physical- algae crust stage (PACS), algae-lichen crust stage (ALCS) and lichen-mossScrust stage (LMCS) in the edge of Minqin oasis were measured and studied. The results showed that: 1) The formation and development of biological soil crust from NCS to ALCS not only significantly increased fine soil particle (0-200μm) content, but also decreased soil coarse particle(200-2000μm) content. However,there was no significant change in soil particle composition from ALCS to LMCS. 2) The succession of biological soil crust had obviously influence on the contents of soil organic matter, total nitrogen, available phosphorus and potassium, and these contents were gradually increasing with its succession. 3) In the preceed of biological soil crust succession, all the quantities of soil bacteria, fungi and actinomycetes showed a trend of first increase and then decrease,and their peak value appeared in the PACS. At the same time, the soil total algae biomass were continuous increased. Furthermore, microbial quantities or biomass also presented a trend of first increase and then decrease during the May to December. 4) In succession process from NCS to PACS,the change of soil particle composition was one of main factors driving soil microorganism and nutrient contents to vary. In succession process from PACS to LMCS, soil algae, lichen and mosses were main factors improving nutrient content. This suggested that the formation and evolution development of biological soil crust distributing in the surface layer soil of dunes of Minqin oasis fringe not only effectively improves shallow soil quality,but also plays great role in improving soil ecosystem and protecting ecological environment.
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