Dynamics of arbuscular mycorrhizal fungi and glomalin in the rhizosphere of Artemisia ordosica Krasch in Mu Us sandland, China
Dynamics of arbuscular mycorrhizal fungi and glomalin in the rhizosphere of Artemisia ordosica Krasch in Mu Us sandland, China
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DOI：
10.1016/j.soilbio.2010.03.022
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发表时间：
2010-08-01
影响因子：
9.7
通讯作者：
Zhao, Lili
中科院分区：
文献类型：
--
作者：
He, Xueli;Li, Yingpeng;Zhao, Lili
为了解半干旱和干旱地区丛枝菌根（AM）群落的生态学意义，对毛乌素沙地AM真菌和球囊霉素的时空动态进行了研究。油蒿根际土壤样品。分别于2007年5月、7月和10月采集。AM真菌丛枝、菌丝、总根侵染率和孢子密度均在夏季达到高峰。结果表明，土壤总Bradford反应蛋白（T-BRSPs）含量在100%~ 200%之间。TG）和易提取的Bradford反应性土壤蛋白（EE-BRSPs、EEG）在春季达到最大值。0-10 cm土层的孢子密度和2种生物活性物质组分最高，而30-50 cm土层的2种生物活性物质组分与土壤有机碳的比值最高。菌丝侵染率与土壤酶活性（土壤脲酶和酸性磷酸酶）呈显著负相关（P < 0.05）。丛枝病与土壤酸性磷酸酶呈极显著负相关（P < 0.01）。孢子密度与土壤因子（土壤速效氮、有机磷、有机碳）和土壤酶活性（土壤酸性和碱性磷酸酶）呈极显著正相关（P < 0.01）。两种BRSPs组分与土壤速效N、SOC和土壤酶活性均呈极显著正相关（P < 0.01）。TG与土壤Olsen P呈显著正相关（P < 0.05）。毛乌素沙地AM真菌和球囊霉素的动态具有很强的时间和深度格局，并受养分有效性和酶活性的影响，球囊霉素与AM真菌群落、土壤养分动态和碳循环的关系可作为评价荒漠生态系统质量和功能的有效指标。(c)2010爱思唯尔有限公司版权所有。
To understand the ecological significance of arbuscular mycorrhizal (AM) associations in semi-arid and arid lands, the temporal and spatial dynamics of AM fungi and glomalin were surveyed in Mu Us sandland, northwest China. Soil samples in the rhizosphere of Artemisia ordosica Krasch. were collected in May, July and October 2007, respectively. Arbuscular, hyphal and total root infection and spore density of AM fungi peaked in summer. The mean contents of total Bradford-reactive soil proteins (T-BRSPs. TG) and easily extractable Bradford-reactive soil proteins (EE-BRSPs, EEG) reached maximal values in spring. Spore density and two BRSPs fractions were the highest in the 0-10 cm soil layer, but the ratios of two BRSPs fractions to soil organic carbon (SOC) were the highest in the 30-50 cm soil layer. Hyphal infection was negatively correlated with soil enzymatic activity (soil urease and acid phosphatase) (P < 0.05). Arbuscular infection was negatively correlated with soil acid phosphatase (P < 0.01). Spore density was positively correlated with edaphic factors (soil available N, Olsen P. and SOC) and soil enzymatic activity (soil acid and alkaline phosphatase) (P < 0.01). Two BRSPs fractions were positively correlated with edaphic factors (soil available N and SOC) and soil enzymatic activity (soil urease, acid and alkaline phosphatase) (P < 0.01). TG was positively correlated with soil Olsen P (P < 0.05). We concluded that the dynamics of AM fungi and glomalin have highly temporal and depth patterns, and influenced by nutrient availability and enzymatic activity in Mu Us sandland, and suggest that glomalin are useful indicators for evaluating soil quality and function of desert ecosystem on the basis of its relationship to AM fungal community, soil nutrient dynamics and carbon cycle. (c) 2010 Elsevier Ltd. All rights reserved.