荒漠区不同大小灌丛周围土壤微生物生物量及活性特征

doi:10.11686/cyxb20150209

草业学报 ›› 2015, Vol. 24 ›› Issue (2): 70-76.DOI: 10.11686/cyxb20150209

荒漠区不同大小灌丛周围土壤微生物生物量及活性特征

陈鸿洋¹, 尚振艳¹, 傅华¹, 张宝林², 张斯莲³, 牛得草^{1*, *}

1.草地农业生态系统国家重点实验室,兰州大学草地农业科技学院,甘肃兰州 730020;
2.内蒙古阿拉善盟草原总站,内蒙古巴彦浩特 750306;
3.内蒙古阿拉善盟气象局,内蒙古巴彦浩特 750306

收稿日期:2013-08-27 出版日期:2015-02-20 发布日期:2015-02-20
作者简介:陈鸿洋(1988-),男,河南渑池人,在读硕士。E-mail:chenhy11@lzu.edu.cn
基金资助:
长江学者和创新团队发展计划(IRT13019),中国科学院战略性先导科技专项(XDA05050406-8),国家科技基础性工作专项(2012FY111900),国家自然科学基金(31070412)和高等学校博士学科点专项科研基金(20120211110029)资助

Soil microbial biomass and activity under desert shrub canopies

CHEN Hongyang¹, SHANG Zhenyan¹, FU Hua¹, ZHANG Baolin², ZHANG Silian³, NIU Decao^{1, *}

1.State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China;
2.Alxa Alliance Grassland Station of Inner Mongolia, Bayanhaote 750306, China;
3.Alxa League Meteorological Bureau of Inner Mongolia, Bayanhaote 750306, China

Received:2013-08-27 Online:2015-02-20 Published:2015-02-20

摘要/Abstract

摘要： 为了解不同大小灌丛对荒漠区土壤生物学性状的影响与作用,本研究在东阿拉善荒漠区选择两组不同大小的红砂灌丛,研究其周围土壤资源的空间异质性和土壤微生物特性的变化规律。结果表明,红砂灌丛下沙堆土壤有机碳和全氮含量显著大于其内部和外部土壤,随灌丛增大,沙堆有机碳和全氮含量无显著变化,而土壤水分含量显著增加;另外,灌丛周围土壤微生物生物量碳氮含量较低,分别为55.23~113.81 mg/kg和5.46~7.66 mg/kg,其中,灌丛内部土壤微生物生物量碳含量和微生物熵(qMB)显著高于灌丛外部与沙堆,而土壤微生物呼吸熵(qCO₂)变化与之相反;随灌丛增大,内部土壤微生物生物量与微生物活性保持稳定,变化较小。以上结果说明红砂灌丛对风蚀拦截形成的沙堆富含大量养分,但沙堆养分含量与灌丛大小无关,同时沙堆的形成对维持灌丛内部土壤微环境的稳定与健康具有重要作用。

Abstract: The effects of different size shrub (two groups of Reaumuria soongorica shrubs) on the spatiotemporal heterogeneity of soil properties were studied in the eastern Alxa Plateau. The soil organic carbon (SOC) and total nitrogen (TN) were significantly higher in the nebkha (dune) beneath and at the perimeter of shrub canopies. No differences were observed for SOC and TN in nebkhas under shrubs of different size. However, soil water content of nebkhas increased markedly with increasing shrub size. Soil microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN) were 55.23-113.81 mg/kg and 5.46-7.66 mg/kg, respectively. The soil MBC and microbial quotient (qMB) were significantly higher beneath the shrub canopies than at the perimeter. The soil microbial biomass and activity beneath the shrub canopy remained relatively stable. The nebkha under the shrub canopies contained more nutrients but was not affected by shrub size. The formation of nebkha played an important role in maintaining the stability and health of the soil microenvironment beneath shrub canopies.

陈鸿洋, 尚振艳, 傅华, 张宝林, 张斯莲, 牛得草. 荒漠区不同大小灌丛周围土壤微生物生物量及活性特征[J]. 草业学报, 2015, 24(2): 70-76.

CHEN Hongyang, SHANG Zhenyan, FU Hua, ZHANG Baolin, ZHANG Silian, NIU Decao. Soil microbial biomass and activity under desert shrub canopies[J]. Acta Prataculturae Sinica, 2015, 24(2): 70-76.

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荒漠区不同大小灌丛周围土壤微生物生物量及活性特征

Soil microbial biomass and activity under desert shrub canopies

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