Spatial distribution of arbuscular mycorrhiza and glomalin in the rhizosphere of Caragana korshinskii Kom. in the Otindag sandy land, China
Spatial distribution of arbuscular mycorrhiza and glomalin in the rhizosphere of Caragana korshinskii Kom. in the Otindag sandy land, China
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DOI：
10.5897/ajmr11.1560
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发表时间：
2012-07
影响因子：
--
通讯作者：
Huijuan Guo;Xueli He;Yingpeng Li
中科院分区：
文献类型：
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作者：
Huijuan Guo;Xueli He;Yingpeng Li
为探讨干旱生态系统中丛枝菌根（AM）的生态学意义，对北方浑善达克桑迪4个样地AM真菌、球囊霉素和土壤酶的空间格局进行了研究。对柠条（Caragana korshinskii Kom.）于2009年7月在0-10、10-20、20-30、30-40和40-50 cm深度采集。研究表明，C.红松科能与AM真菌形成较强的共生关系。AM真菌定殖率、孢子密度、总Bradford反应性土壤蛋白（T-BRSP）和易提取Bradford反应性土壤蛋白（EE-BRSP）在4个地点和土壤深度之间存在显著差异。相关分析表明，菌丝定殖量与土壤脲酶活性呈极显著正相关（P < 0.01）。孢子密度、T-BRSP和EE-BRSP与土壤有机碳、速效氮、速效磷、土壤脲酶、酸性磷酸酶和碱性磷酸酶均呈极显著正相关（P < 0.01）。逐步回归分析表明，土壤脲酶、速效氮和有机碳是影响AM真菌和球囊霉素空间分布的主要土壤因子。结果支持球囊霉素可作为评价土壤肥力的一个合适指标的结论。此外，AM真菌和球囊霉素的空间分布格局是有用的监测荒漠化和土壤退化。关键词：空间动态，丛枝菌根，球囊霉素相关土壤蛋白，柠条，奥廷达格桑迪。
To understand the ecological significance of arbuscular mycorrhizal (AM) associations in arid ecosystem, the spatial patterns of AM fungi, glomalin and soil enzymes were surveyed at four sites located in the Otindag sandy land, northern China. Soil samples in the rhizosphere of Caragana korshinskii Kom. were collected at 0-10, 10-20, 20-30, 30-40 and 40-50 cm depth in July 2009. The study showed that C. korshinskii Kom. could form strong symbiotic relationship with AM fungi. AM fungal colonization, spore density, total Bradford-reactive soil protein (T-BRSP) and easily extractable Bradford-reactive soil protein (EE-BRSP) significantly differed among four sites and soil depths. Correlation analysis showed hyphal colonization had positive correlation with soil urease (P < 0.01). Spore density, T-BRSP and EE-BRSP were positively correlated with soil organic carbon, available N and P, and soil urease, acid phosphatase and alkaline phosphatase (P < 0.01). Based on stepwise regression, soil urease, available N and organic carbon were principal soil factors affecting the spatial distribution of AM fungi and glomalin. The results support the conclusion that glomalin may be an appropriate index for evaluating soil fertility. Moreover, the spatial distribution pattern of AM fungi and glomalin are useful to monitor desertification and soil degradation. Key words: Spatial dynamics, arbuscular mycorrhiza, glomalin-related soil protein,Caragana korshinskii Kom., Otindag sandy land.