Institute of Environment and Ecology, Academy of Environmental Health and Ecological Security & School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China.
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, China.
Plant Biol (Stuttg). 2019 Sep;21(5):951-960. doi: 10.1111/plb.13003. Epub 2019 May 24.
Soil N -fixing bacterial communities (SNB) can enhance soil N availability and the invasiveness of invaders. Some invaders display different degrees of invasion across different climate regions. Given that bacterial communities may change with different climate regions, it is important to understand soil micro-ecological mechanisms driving the successful invasion of invaders across different climate regions. This study performed cross-site comparisons to comprehensively analyse effects of the invasive tree staghorn sumac (Rhus typhina L.) on the structure of SNB. In north China, we selected three sites within two sampling regions (a warm temperate region and a cold temperate region). Staghorn sumac invasion did not significantly affect soil physicochemical properties and the diversity and richness of SNB. LEfSe analysis showed that numerous SNB taxa changed significantly during staghorn sumac invasion. This may be attributed in part to the selective effects of allelochemicals released by staghorn sumac via leaf litter and/or root exudates. Consequently, staghorn sumac invasion may alter the structure, rather than the diversity and richness, of SNB to facilitate its invasion process by establishing a favourable soil microenvironment in the invaded habitats. The number of species and richness of SNB under staghorn sumac invasion were significantly lower in the warm temperate region than in the cold temperate region. A possible reason for the increased diversity and richness of SNB under staghorn sumac invasion in the cold temperate region may be because staghorn sumac in the cold temperate region can provide more nutrients into the soil sub-ecosystem, presumably to support a higher diversity and richness of SNB via the nutritional requirements of SNB. The changed structure of SNB under staghorn sumac invasion, especially across different climate regions, may play an important role in its successful invasion across most regions of north China.
土壤固氮菌群落（SNB）可以提高土壤氮素有效性和入侵生物的入侵性。一些入侵生物在不同的气候区表现出不同程度的入侵。由于细菌群落可能随不同的气候区而变化，因此了解驱动入侵生物在不同气候区成功入侵的土壤微生态机制非常重要。本研究通过跨站点比较，全面分析了入侵树种鹿角漆树（Rhus typhina L.）对 SNB 结构的影响。在中国北方，我们在两个采样区（暖温带和中温带）内选择了三个地点。鹿角漆树入侵并未显著影响土壤理化性质和 SNB 的多样性和丰富度。LEfSe 分析表明，大量 SNB 分类群在鹿角漆树入侵过程中发生了显著变化。这可能部分归因于鹿角漆树通过凋落物和/或根分泌物释放的化感物质的选择作用。因此，鹿角漆树入侵可能通过在入侵生境中建立有利的土壤微环境来改变 SNB 的结构，而不是多样性和丰富度，从而促进其入侵过程。在暖温带，鹿角漆树入侵下 SNB 的物种数量和丰富度明显低于中温带。在中温带，鹿角漆树入侵下 SNB 多样性和丰富度增加的一个可能原因是，中温带的鹿角漆树可能会将更多的养分输入土壤亚生态系统，可能通过 SNB 的营养需求来支持 SNB 的更高多样性和丰富度。鹿角漆树入侵下 SNB 结构的变化，特别是在不同的气候区之间，可能在其在中国北方大部分地区的成功入侵中发挥重要作用。
