呼伦贝尔沙地樟子松人工林土壤细菌网络特征

Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2023-08-25 Cooperative journals: 《干旱区研究》

张颂安1 刘轩1 赵珮杉1 高广磊1,2,3 张英1,3 丁国栋1,2,3 柳叶1 任悦1

Abstract： To elucidate soil bacterial network interactions within Pinus sylvestris var. mongolica plantations inthe Hulunbuir Desert. P. sylvestris plantations representing three different age groups (25 a, 34 a, and 43 a) andtwo soil layers (0- 10 and 10- 20 cm) were selected to assess their soil bacterial networks using molecularecological network analysis and data from a referenced grassland. The numbers of network edges increased, theaverage path length reduced from 25 a to 43 a. While the number of network edges reduced and the average pathlength increased with soil layers from 0-10 cm to 10-20 cm. Compared with the grassland, the P. sylvestrisplantations had a lower network edge, and the soil bacterial network was less complicated. The soil bacteria werefound to belong to the Acidimicrobiales, RB41, and MB-A2-108 in the 25 a plantation, Gaiellales in the 34 aplantation, and Gaiellales, RB41, Subgroup_7, Subgroup_6, and DA101_soil_group in the 43 a plantation,Latescibacteria in the grassland. The soil bacterial network was significantly positively correlated with ammonianitrogen, total nitrogen, microbial carbon content, and urease activities and significantly negatively correlatedwith invertase and catalase activities, soil water content and available phosphorus (P < 0.05). The soil organicmatter had both positive and negative effects (P < 0.05). The soil bacterial network complexity and compactnessincreased from 25 a to 43 a. The opposite was found for the soil layers from 0-10 cm to 10-20 cm. Comparedwith the grassland, the soil bacterial network of the P. sylvestris plantation was less complicated. The keystonesoil bacteria species were different among the three stand ages, and were greatest in stand 43 a. There were morekeystone species in the plantation than the grassland. Soil physicochemical properties and enzymatic activityderived the soil bacterial network, and soil organic matter was the major influencing factor. This improvedinformation contributed to a deep understanding of the soil bacterial community and provided a scientific andtechnological basis for the sustainable management of P. sylvestris plantations in the Hulunbuir Desert.
 

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