Heterogeneous soil conditions influence fungal alkaline phosphatase activity in roots of Lotus corniculatus
Heterogeneous soil conditions influence fungal alkaline phosphatase activity in roots of Lotus corniculatus
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DOI：
10.1016/j.apsoil.2017.03.024
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发表时间：
2017-08-01
影响因子：
4.8
通讯作者：
Naeth, M. Anne
中科院分区：
文献类型：
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作者：
Boldt-Burisch, Katja;Naeth, M. Anne
土壤水分、温度、pH和无机养分有效性的极端情况会极大地影响菌根的形成和养分的获取。然而，土壤异质性和土壤季节变化对菌根真菌碱性磷酸酶(ALP)活性的影响尚不清楚。研究了生长季土壤质地异质性、土层厚度、养分浓度和根系密度是否影响根内真菌碱性磷酸酶的活性。5~9月，对复垦地莲花根系0~10、10~20、20~30 cm土层和粘粉碎屑(主要分布在10~20 cm土层)的根际碱性磷酸酶(ALP)活性进行了分析。测定了每个样品的根长、密度和砂土和粘粒中的水溶性养分含量。土壤水分和土壤温度数据被用来分析采样日期的气候条件。生长在粘土-粉质碎屑中的根部真菌碱性磷酸酶活性高于生长在砂质土壤中的根部真菌碱性磷酸酶活性，与取样日期无关。砂质土壤中真菌碱性磷酸酶活性随着土壤深度的增加而增加，这与根密度的降低和养分浓度的降低有关。然而，营养致密的粘土-粉尘碎屑显著正向影响了角叉菜根部菌根碱性磷酸酶的活性，表明菌根选择性地吸收营养热点中的磷和其他养分的能力得到了提高，这可能对在贫瘠的开垦地成功建立先锋植物物种起到重要作用。
Extremes in soil water, temperature, pH and inorganic nutrient availability can highly influence mycorrhizal formation and nutrient acquisition. However, the influence of soil heterogeneity and seasonal soil changes on fungal alkaline phosphatase (ALP) activity in mycorrhizal roots is unknown. Whether the activity of intraradical fungal ALP is influenced by soil texture heterogeneity, soil depth, nutrient concentrations and root density during the growing season were addressed in this research. The root system of Lotus corniculatus grown on a reclamation site was analyzed for intraradical mycorrhizal ALP activity in 0-10, 10-20 and 20-30 cm depth increments of sandy soil and in clay-silt fragments (mostly localized in 10-20 cm) from May to September. Root length density and water soluble nutrient contents in sandy soil and clay-silt fragments were determined for each sample. Soil water content and soil temperature data of a nearby site were used for climate conditions on sampling dates. Fungal ALP activity in roots growing in clay-silt fragments was higher than in those growing in sandy soil, independent of sampling date. Fungal ALP activity in sandy soil increased with soil depth which is related to decreasing root densities and lower nutrient concentrations. However, nutrient dense clay-silt fragments significantly positively influenced local mycorrhizal ALP activity in L. corniculatus roots, suggesting that the ability of mycorrhizae to selectively take up phosphorus and other nutrients from those nutrient hot spots is enhanced and could play a significant role in successful establishment of pioneer plant species on infertile reclamation sites.