Home‐field advantage, N‐priming and precipitation independently govern litter decomposition in a plant diversity manipulation
Home‐field advantage, N‐priming and precipitation independently govern litter decomposition in a plant diversity manipulation
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DOI：
10.1111/1365-2435.14515
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发表时间：
2024-02
影响因子：
5.2
通讯作者：
L. Podzikowski;E. Duell;Haley M Burrill;James D. Bever
中科院分区：
文献类型：
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作者：
L. Podzikowski;E. Duell;Haley M Burrill;James D. Bever
凋落物分解促进了有限资源的再循环，这可能会促进植物对多样性的生产力反应，即丰产。然而，分解，k，和丰产之间的直接关系仍然在草地多样性操作underexplored。我们测试了微生物的局部适应，即主场优势（HFA），植物输入或降水的N启动是否会驱动分解，以及分解是否会产生丰产。在草地多样性操作中，改变植物丰富度（1，2，3和6种），组成（由单科或多科植物组成的群落）和降水量（50%和150%的环境生长季节降水），我们进行了凋落物分解实验。2020年春季，我们部署了四个重复的柳枝稷垃圾袋（1. 59毫米网眼），收集了7个月以估计垃圾k。降水是一个强大的，独立的驱动程序的分解。柳枝稷分解加速与草丰富和减速的系统发育差异柳枝稷增加，这表明分解是最快的“家”。然而，分解减慢柳枝稷密度。在地块，包含柳枝稷，我们没有观察到之间的关系分解和真菌saprotrophs不同柳枝稷。然而，在没有柳枝稷的地块，分解减慢，从柳枝稷的腐生性差异增加。结合这些研究结果表明，HFA是最强的密切相关的邻居，也就是说，异种邻居，是存在于社会中，而不是同一物种的其他个体，也就是同种。豆科植物加速分解，在这些地块中剩余更多的凋落物N，这表明来自种植豆科植物的N输入引发了凋落物C的分解。然而，在豆科植物群落中，分解和过度生产是无关的。而在草地群落中，超产和分解呈正相关，且在柳枝稷密度低的小区中，即与异种邻居的关系最强。结合这些研究结果表明，植物物种丰富度和群落组成通过多种机制刺激凋落物分解，包括N启动，但只有来自密切相关物种的微生物局部适应的HFA与丰产相关，可能通过资源再循环。我们的研究结果将多样性与促进地上生产力的生态系统过程联系起来。多样性丧失是否会影响凋落物分解、生产力或两者兼而有之，取决于当地植物的性状以及是否维持了适应当地的土壤微生物组。请在《华尔街日报》博客上阅读这篇文章的免费简明语言摘要。
Litter decomposition facilitates the recycling of often limiting resources, which may promote plant productivity responses to diversity, that is, overyielding. However, the direct relationship between decomposition, k, and overyielding remains underexplored in grassland diversity manipulations. We test whether local adaptation of microbes, that is, home‐field advantage (HFA), N‐priming from plant inputs or precipitation drive decomposition and whether decomposition generates overyielding. Within a grassland diversity‐manipulation, altering plant richness (1, 2, 3 and 6 species), composition (communities composed of plants from a single‐family or multiple‐families) and precipitation (50% and 150% ambient growing season precipitation), we conducted a litter decomposition experiment. In spring 2020, we deployed four replicate switchgrass, Panicum virgatum, litter bags (1.59 mm mesh opening), collecting them over 7 months to estimate litter k. Precipitation was a strong, independent driver of decomposition. Switchgrass decomposition accelerated with grass richness and decelerated as phylogenetic dissimilarity from switchgrass increased, suggesting decomposition is fastest at ‘home’. However, decomposition slowed with switchgrass density. In plots that contained switchgrass, we observed no relationship between decomposition and fungal saprotroph dissimilarity from switchgrass. However, in plots without switchgrass, decomposition slowed with increasing saprotroph dissimilarity from switchgrass. Combined these findings suggest that HFA is strongest when closely related neighbours, that is, heterospecific neighbours, are present in the community, rather than other individuals of the same species, that is, conspecifics. Legumes accelerated decomposition with more litter N remaining in those plots, suggesting that N‐inputs from planted legumes are priming decomposition of litter C. However, decomposition and overyielding were unrelated in legume communities. While in grass communities, overyielding and decomposition were positively related and the relationship was strongest in plots with low densities of switchgrass, that is, with heterospecific neighbours. Combined these findings suggest that plant species richness and community composition stimulate litter decomposition through multiple mechanisms, including N‐priming, but only HFA from local adaptation of microbes on closely related species correlates with overyielding, likely through resource recycling. Our results link diversity with ecosystem processes facilitating above‐ground productivity. Whether diversity loss will affect litter decomposition, productivity or both is contingent on resident plant traits and whether a locally adapted soil microbiome is maintained. Read the free Plain Language Summary for this article on the Journal blog.