The effects of simulated nitrogen deposition on plant root traits: A meta-analysis

Li, Weibin; Jin, Changjie; Guan, Dexin; Wang, Qingkui; Wang, Anzhi; Yuan, Fenghui; Wu, Jiabing

doi:10.1016/j.soilbio.2015.01.001

Cited by 247 publications

(146 citation statements)

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“…Belowground NPP results are similarly heterogeneous. A meta-analysis of fine root production across temperate and wet tropical ecosystems showed decreases in fine root production with increases in N deposition, coupled with an increase in coarse root stocks (Li et al, 2015b). By contrast, a savannah fertilization experiment showed increased fine root production only in plots fertilized with P, and not with N (Barger et al, 2002).…”

Section: Ecosystem Processes: Net Primary Productionmentioning

confidence: 98%

“…Much research has been devoted to understanding how N deposition affects SOC storage in temperate ecosystems (Liu and Greaver, 2010;Lu et al, 2011), and the mechanisms that mediate such changes (Li et al, 2015b). If increased N deposition stimulates plant productivity, inputs to the soil from leaf or root litter may increase.…”

Section: Ecosystem Processes: Soil Carbon Dynamicsmentioning

confidence: 99%

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Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

et al. 2015

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Humans have more than doubled inputs of reactive nitrogen globally and greatly accelerated the biogeochemical cycles of phosphorus and metals. However, the impacts of increased element mobility on tropical ecosystems remain poorly quantified, particularly for the vast tropical dry forest biome. Tropical dry forests are characterized by marked seasonality, relatively little precipitation, and high heterogeneity in plant functional diversity and soil chemistry. For these reasons, increased nutrient deposition may affect tropical dry forests differently than wet tropical or temperate forests. Here, we review studies that investigated how nutrient availability affects ecosystem and community processes from the microsite to ecosystem scales in tropical dry forests. The effects of N and P addition on ecosystem carbon cycling and plant and microbial dynamics depend on forest successional stage, soil parent material, and rainfall regime. Responses may depend on whether overall productivity is N-vs. P-limited, although data to test this hypothesis are limited. These results highlight the many important gaps in our understanding of tropical dry forest responses to global change. Large-scale experiments are required to resolve these uncertainties.

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Section: Ecosystem Processes: Net Primary Productionmentioning

confidence: 98%

Section: Ecosystem Processes: Soil Carbon Dynamicsmentioning

confidence: 99%

Nutrient addition effects on tropical dry forests: a mini-review from microbial to ecosystem scales

et al. 2015

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“…Along with soil particles, biological components such as roots, fungal hyphae, and microbial biomass and necromass, all contribute to aggregate formation (Oades and Waters 1991;Jastrow et al 1998;Six et al 2004;Wilson et al 2009;King 2011;Gupta and Germida 2015). Nitrogen addition can decrease plant investment in belowground nutrient acquisition (such as root biomass and mycorrhizae), leading to less belowground biomass (Feng et al 2010;Janssens et al 2010;Li et al 2015). Consequently, we expect aggregate-binding ''agents'' and aggregate-occluded SOM to decrease in response to N addition.…”

mentioning

confidence: 97%

Nitrogen addition changes grassland soil organic matter decomposition

et al. 2015

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Humans have dramatically increased the deposition and availability of nutrients, such as nitrogen (N), worldwide. Soil organic matter (SOM) is a significant global reservoir of carbon (C); however, the effects of N enrichment on this large, heterogeneous C stock are unclear. Nitrogen has variable effects on the biological, chemical, and physical factors that determine SOM pool mean residence time; consequently, we predicted that N enrichment would have distinct effects on SOM pools, including the pool that is readily available for microbial decomposition, as well as the pools that have been stabilized against microbial decomposition via aggregate occlusion and mineral association. We addressed this gap in knowledge by measuring the effects of N addition on different SOM pools at five grassland experiments in the US Central Great Plains that participate in the Nutrient Network and have been fertilized for three or five years. Overall, N addition decreased microbial respiration of unoccluded OM by as much as 29 % relative to control plots, and consequently, decreased C loss from this pool. Furthermore, N addition tended to increase soil aggregation and C occlusion in large macro-aggregates. These results suggest that N addition will increase C sequestration by slowing the decomposition of SOM, as well as stabilizing SOM against microbial decomposition in aggregate-occluded pools. However, the effects of N on all pools studied varied among sites, possibly due to site variation in soil texture. Consequently, increased sequestration of soil C in response to N enrichment may not be universal across grasslands.

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“…2%, 但由于细根周转快速, 消耗了20%−30%的年净初级生产力 (Jackson et al, 1997;Poorter et al, 2011), (Eissenstat et al, 2000), 这在氮沉降梯度研究和元素添加试验中得到了广泛证明 (Ostonen et al, 2007;Li et al, 2015)。近几十年来, 由于工农业发展和化石燃料的大量燃烧导致氮沉降在全球范围增加, 人类活动极大地干扰了全球氮循环 (Galloway & Cowling, 2002;Galloway et al, 2004), 对森林生态系统物质循环造成了潜在的巨大影响(吕超群等, 2007)。大量研究表明, 日益增加的氮沉降会增加土壤氮素可利用性, 多数情况会下提高植被地上部分生产力 (Bedison & Mcneil, 2009)。然而森林植物根系对土壤氮素增加的响应方向和程度却存在很大的不确定性。有研究表明氮添加增加了根系寿命, 减缓了细根周转速率 (Jourdan et al, 2008;于水强等, 2009;Mei et al, 2010), 但也有研究观察到与之相反的结果 (Johnson et al, 2000;Wang et al 2012 …”

Section: 细根占陆地生态系统植物总生物量的比例小于unclassified