Resistance of subarctic soil fungal and invertebrate communities to disruption of below-ground carbon supply
Resistance of subarctic soil fungal and invertebrate communities to disruption of below-ground carbon supply
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DOI：
10.1111/1365-2745.13994
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发表时间：
2022-10-17
影响因子：
5.5
通讯作者：
Wookey, Philip A.
中科院分区：
文献类型：
--
作者：
Parker, Thomas C.;Chomel, Mathilde;Wookey, Philip A.
植物对土壤的光合作用是调节土壤生物多样性的重要机制。在北极，大规模的植被过渡正在应对气候变暖，迫切需要了解这些变化如何影响土壤生物多样性和功能。我们调查了土壤真菌和无脊椎动物的丰度和多样性如何应对减少新鲜的地下phototherapy供应林线桦树和杨柳，实现茎环剥。我们假设，桦树林将支持更丰富的外生菌根（ECM）真菌物种和动物比杨柳灌木，环剥将导致从ECM真菌腐养菌的快速切换冠层供应的C被切断，与土壤动物的伴随下降。桦树林有更大的真菌和区系丰度与根相关的子囊菌（杜鹃花菌根真菌和根内生菌）相比，杨柳灌木地块，其中有较高比例的saprotrophs和，与我们的预期相反，ECM真菌的大贡献。大规模的土壤真菌和动物的功能群组成没有显着改变环剥，即使在第三年的治疗。在ECM社区，有一些变化，与属，被认为是特别C-需求下降，在环带图。然而，值得注意的是，大多数ECM真菌仍然存在3年的隔离地下室从当代photochemical供应。合成.在林线/苔原生态系统中，不同的土壤群落存在于对比植被斑块内的景观，但这些社区的结构是耐冠层干扰和随之而来的减少自养C输入。
The supply of recent photosynthate from plants to soils is thought to be a critical mechanism regulating the activity and diversity of soil biota. In the Arctic, large-scale vegetation transitions are underway in response to warming, and there is an urgent need to understand how these changes affect soil biodiversity and function. We investigated how abundance and diversity of soil fungi and invertebrates responded to a reduction in fresh below-ground photosynthate supply in treeline birch and willow, achieved using stem girdling. We hypothesised that birch forest would support greater abundance of ectomycorrhizal (ECM) fungal species and fauna than willow shrubs, and that girdling would result in a rapid switch from ECM fungi to saprotrophs as canopy supply of C was cut, with a concomitant decline in soil fauna. Birch forest had greater fungal and faunal abundance with a large contribution of root-associated ascomycetes (ericoid mycorrhizal fungi and root endophytes) compared to willow shrub plots, which had a higher proportion of saprotrophs and, contrary to our expectations, ECM fungi. Broad-scale soil fungal and faunal functional group composition was not significantly changed by girdling, even in the third year of treatment. Within the ECM community, there were some changes, with genera that are believed to be particularly C-demanding declining in girdled plots. However, it was notable how most ECM fungi remained present after 3 years of isolation of the below-ground compartment from contemporary photosynthate supply. Synthesis. In a treeline/tundra ecosystem, distinct soil communities existed in contrasting vegetation patches within the landscape, but the structure of these communities was resistant to canopy disturbance and concomitant reduction of autotrophic C inputs.