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Exotic pine trees are often introduced to novel places worldwide. How exotic pines interact with local microbial communities, such as symbiotic ectomycorrhizal (ECM) fungi, during early establishment compared to interactions by their native counterparts remains to be examined in detail. In this study, native masson pine (Pinus massoniana) and exotic slash pine (Pinus elliottii) seedlings were grown in field-collected soil cores. ECM root tips were collected 3- and 6-months after planting and fungi were identified using high-throughput sequencing. We found that host identity was a key factor determining ECM fungal community assembly after 3-months: native pines associated with Rhizopogon while exotic pines associated primarily with ECM generalists. After 6-months growth, however, ECM fungal communities in native and exotic pines were both dominated by Rhizopogon species. We also found that host selections of several pioneer ECM fungi shared by both native and exotic pines may facilitate an exotic pine's establishment. These findings indicate that more attention should be paid to ECM fungal community shuffling by exotic trees during early establishment and, in turn, the influence of the potential changes in ECM fungal communities on local forest ecosystems.
Chen Ning; Louise M. Egerton-Warburton; Gregory M. Mueller; Wenhua Xiang; Wende Yan; Shuguang Liu. Shifts in ectomycorrhizal fungal community composition during the early establishment of native and exotic pine seedlings. Applied Soil Ecology 2020, 157, 103722 .
AMA StyleChen Ning, Louise M. Egerton-Warburton, Gregory M. Mueller, Wenhua Xiang, Wende Yan, Shuguang Liu. Shifts in ectomycorrhizal fungal community composition during the early establishment of native and exotic pine seedlings. Applied Soil Ecology. 2020; 157 ():103722.
Chicago/Turabian StyleChen Ning; Louise M. Egerton-Warburton; Gregory M. Mueller; Wenhua Xiang; Wende Yan; Shuguang Liu. 2020. "Shifts in ectomycorrhizal fungal community composition during the early establishment of native and exotic pine seedlings." Applied Soil Ecology 157, no. : 103722.
Increases in bioavailable nitrogen (N) level can impact the soil carbon (C) sequestration in many forest ecosystems through its influences on litter decomposition and soil respiration (Rs). This study aims to detect whether the litter management can affect the influence of N addition on Rs. We conducted a one-year field experiment in a camphor forest of central-south China to investigate the responses of available N status and soil Rs to N addition and litter manipulation. Four N addition plots (NH4NO3; 0, 5, 15, 30 g N m−2 year−1 as N0, N1, N2, N3, respectively) were established with three nested litter treatments: natural litter input (CK), double litter input (LA), and non-litter input (LR). We found a short-lived enhancement effect of N addition on soil (NO3-N) and net nitrification (RN), but not on (NH4-N), net ammonification (RA), or mineralization (RM). N addition also decreased Rs in CK spots, but not in LA or LR spots, in which the negative effects of N additions on Rs were alleviated by either litter addition or reduction. A priming effect was also observed in LA treatments. A structural equation modeling analysis showed that litter treatments had direct positive effects on soil available N contents and Rs, which suggested that litter decomposition may benefit from litter management when N is not a limiting factor in subtropical forests.
Xuyuan Zhang; Yong Li; Chen Ning; Wei Zheng; Dayong Zhao; Ziqian Li; Wende Yan. Litter Management as a Key Factor Relieves Soil Respiration Decay in an Urban-Adjacent Camphor Forest under a Short-Term Nitrogen Increment. Forests 2020, 11, 216 .
AMA StyleXuyuan Zhang, Yong Li, Chen Ning, Wei Zheng, Dayong Zhao, Ziqian Li, Wende Yan. Litter Management as a Key Factor Relieves Soil Respiration Decay in an Urban-Adjacent Camphor Forest under a Short-Term Nitrogen Increment. Forests. 2020; 11 (2):216.
Chicago/Turabian StyleXuyuan Zhang; Yong Li; Chen Ning; Wei Zheng; Dayong Zhao; Ziqian Li; Wende Yan. 2020. "Litter Management as a Key Factor Relieves Soil Respiration Decay in an Urban-Adjacent Camphor Forest under a Short-Term Nitrogen Increment." Forests 11, no. 2: 216.
Introducing exotic tree species for afforestation out of their natural range may alter the local ectomycorrhizal (ECM) fungal communities. The potential functional consequences shaped by exotic trees with recruited local ECM fungi rather than native trees remain unclear. This study examined (a) whether the composition and extracellular enzyme function of ECM fungal communities differed between native masson pine (Pinus massoniana) and exotic slash pine (Pinus elliottii) during seedling establishment; and (b) how differences in enzyme functioning were linked to the growth pattern of the host plants. Native (masson) and exotic (slash) pine seedlings were planted into soil cores collected from each study site. At three months growth, root tips were collected from seedlings and assayed for ECM fungal community composition using high-throughput sequencing, and functioning using single root tip assays for enzymes associated with N, P and C acquisition. ECM fungi on masson pines showed higher activities of nitrogen- (N-acetylglucosaminidase, 280–300%), phosphorus- (acid phosphatase, 105–152%), and cellulose (β-glucosidase, 204–235%; cellobiohydrolase, 142–255%) compound degrading enzymes compared to those on slash pines. Those differences was attributed to the host-specific performance of certain ECM fungal taxa, such as Rhizopogon spp. Information theory model selection showed that plant nutrient status in masson pines was correlated with the enzymatic contribution of Rhizopogon spp., whereas slash pines depended on a diverse enzyme palette from multiple ECM fungal taxa. Host identity strongly influenced ECM fungal community composition and extracellular enzymatic functions of specific ECM fungal taxa, which could feedback to host establishment and nutrient cycling processes of restored ecosystem. Therefore, the origin of afforestation tree species should be an important factor when selecting tree species for restoration of degraded lands.
Chen Ning; Wenhua Xiang; Gregory M. Mueller; Louise M. Egerton-Warburton; Wende Yan; Shuguang Liu. Differences in ectomycorrhizal community assembly between native and exotic pines are reflected in their enzymatic functional capacities. Plant and Soil 2019, 446, 179 -193.
AMA StyleChen Ning, Wenhua Xiang, Gregory M. Mueller, Louise M. Egerton-Warburton, Wende Yan, Shuguang Liu. Differences in ectomycorrhizal community assembly between native and exotic pines are reflected in their enzymatic functional capacities. Plant and Soil. 2019; 446 (1-2):179-193.
Chicago/Turabian StyleChen Ning; Wenhua Xiang; Gregory M. Mueller; Louise M. Egerton-Warburton; Wende Yan; Shuguang Liu. 2019. "Differences in ectomycorrhizal community assembly between native and exotic pines are reflected in their enzymatic functional capacities." Plant and Soil 446, no. 1-2: 179-193.
Grazing affects nutrient cycling processes in grasslands, but little is known by researchers about effects on the nutrient stoichiometry of plant–soil–microbe systems. In this study, the influence of grazing intensity (0, 0.23, 0.34, 0.46, 0.69, and 0.92 AU ha−1) on carbon (C), nitrogen (N) and phosphorus (P) and their stoichiometric ratios in plants, soil, and microbes was investigated in a Hulunber meadow steppe, Northeastern China. The C:N and C:P ratios of shoots decreased with grazing increased. Leaf N:P ratios
Juan Cao; Ruirui Yan; Xiaoyong Chen; Xu Wang; Qiang Yu; Yunlong Zhang; Chen Ning; Lulu Hou; Yongjuan Zhang; Xiaoping Xin. Grazing Affects the Ecological Stoichiometry of the Plant–Soil–Microbe System on the Hulunber Steppe, China. Sustainability 2019, 11, 5226 .
AMA StyleJuan Cao, Ruirui Yan, Xiaoyong Chen, Xu Wang, Qiang Yu, Yunlong Zhang, Chen Ning, Lulu Hou, Yongjuan Zhang, Xiaoping Xin. Grazing Affects the Ecological Stoichiometry of the Plant–Soil–Microbe System on the Hulunber Steppe, China. Sustainability. 2019; 11 (19):5226.
Chicago/Turabian StyleJuan Cao; Ruirui Yan; Xiaoyong Chen; Xu Wang; Qiang Yu; Yunlong Zhang; Chen Ning; Lulu Hou; Yongjuan Zhang; Xiaoping Xin. 2019. "Grazing Affects the Ecological Stoichiometry of the Plant–Soil–Microbe System on the Hulunber Steppe, China." Sustainability 11, no. 19: 5226.
Exotic non-native Pinus species have been widely planted or become naturalized in many parts of the world. Pines rely on ectomycorrhizal (ECM) fungi mutualisms to overcome barriers to establishment, yet the degree to which host specificity and edaphic preferences influence ECM community composition remains poorly understood. In this study, we used high-throughput sequencing coupled with soil analyses to investigate the effect of host plant identity, spatial distance and edaphic factors on ECM community composition in young (30-year-old) native (Pinus massoniana Lamb.) and exotic (Pinus elliottii Engelm.) pine plantations in China. The ECM fungal communities comprised 43 species with the majority belonging to the Thelephoraceae and Russulaceae. Most species were found associated with both host trees while certain native ECM taxa (Suillus) showed host specificity to the native P. massoniana. ECM fungi that are known to occur exclusively with Pinus (e.g., Rhizopogon) were uncommon. We found no significant effect of host identity on ECM communities, i.e., phylogenetically related pines shared similar ECM fungal communities. Instead, ECM fungal community composition was strongly influenced by site-specific abiotic factors and dispersal. These findings reinforce the idea that taxonomic relatedness might be a factor promoting ECM colonization in exotic pines but that shifts in ECM communities may also be context-dependent.
Chen Ning; Gregory M. Mueller; Louise M. Egerton-Warburton; Wenhua Xiang; Wende Yan. Host Phylogenetic Relatedness and Soil Nutrients Shape Ectomycorrhizal Community Composition in Native and Exotic Pine Plantations. Forests 2019, 10, 263 .
AMA StyleChen Ning, Gregory M. Mueller, Louise M. Egerton-Warburton, Wenhua Xiang, Wende Yan. Host Phylogenetic Relatedness and Soil Nutrients Shape Ectomycorrhizal Community Composition in Native and Exotic Pine Plantations. Forests. 2019; 10 (3):263.
Chicago/Turabian StyleChen Ning; Gregory M. Mueller; Louise M. Egerton-Warburton; Wenhua Xiang; Wende Yan. 2019. "Host Phylogenetic Relatedness and Soil Nutrients Shape Ectomycorrhizal Community Composition in Native and Exotic Pine Plantations." Forests 10, no. 3: 263.
Rapid economic development and accelerated urbanization in China has resulted in widespread atmospheric nitrogen (N) deposition. One consequence of N deposition is the alteration of mycorrhizal symbioses that are critical for plant resource acquisition (nitrogen, N, phosphorus, P, water). In this study, we characterized the diversity, composition, and functioning of ectomycorrhizal (ECM) fungal communities in an urban-adjacent Pinus elliottii plantation under ambient N deposition (~24 kg N ha−1 year−1), and following N fertilization (low N, 50 kg N ha−1 year−1; high N, 300 kg N ha−1 year−1). ECM functioning was expressed as the potential activities of extracellular enzymes required for organic N (protease), P (phosphomonoesterase), and recalcitrant polymers (phenol oxidase). Despite high ambient N deposition, ECM community composition shifted under experimental N fertilization, and those changes were linked to disparate levels of soil minerals (P, K) and organic matter (but not N), a decline in acid phosphatase (AP), and an increase in phenol oxidase (PO) potential activities. Based on enzyme stoichiometry, medium-smooth exploration type ECM species invested more in C acquisition (PO) relative to P (AP) following high N fertilization than other exploration types. ECM species with hydrophilic mantles also showed higher enzymatic PO:AP ratios than taxa with hydrophobic mantles. Our findings add to the accumulating evidence that shifts in ECM community composition and taxa specialized in organic C, N, and P degradation could modulate the soil nutrient cycling in forests exposed to chronic elevated N input.
Chen Ning; Gregory M. Mueller; Louise M. Egerton-Warburton; Andrew W. Wilson; Wende Yan; Wenhua Xiang. Diversity and Enzyme Activity of Ectomycorrhizal Fungal Communities Following Nitrogen Fertilization in an Urban-Adjacent Pine Plantation. Forests 2018, 9, 99 .
AMA StyleChen Ning, Gregory M. Mueller, Louise M. Egerton-Warburton, Andrew W. Wilson, Wende Yan, Wenhua Xiang. Diversity and Enzyme Activity of Ectomycorrhizal Fungal Communities Following Nitrogen Fertilization in an Urban-Adjacent Pine Plantation. Forests. 2018; 9 (3):99.
Chicago/Turabian StyleChen Ning; Gregory M. Mueller; Louise M. Egerton-Warburton; Andrew W. Wilson; Wende Yan; Wenhua Xiang. 2018. "Diversity and Enzyme Activity of Ectomycorrhizal Fungal Communities Following Nitrogen Fertilization in an Urban-Adjacent Pine Plantation." Forests 9, no. 3: 99.