Effects of warming and nitrogen deposition on the coupling mechanism between soil nitrogen and phosphorus in Songnen Meadow Steppe, northeastern China

Zhang, Nan-Yi; Guo, Rui; Song, Piao; Guo, Jixun; Gao, Yingzhi

doi:10.1016/j.soilbio.2013.05.015

Cited by 88 publications

(54 citation statements)

References 72 publications

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“…Low-concentration promotion and high-concentration inhibition were the general rules of the effects of root exudates on the growth of L. chinensis (Figure 1) and nutrient availability ( Figure 2). Soil nutrient availability, especially nitrogen and phosphorus, is often a limiting factor for plant growth in grassland ecosystems [68,69], and is closely related to the nutrient content of the plant [70]. Our stepwise regression analysis also further proved that AN and AP were one of the critical factors affecting the ramet numbers and the above-ground biomass of L. chinensis (Table 3).…”

Section: Effects Of Root Exudates On L Chinensissupporting

confidence: 53%

Interaction Between Root Exudates of the Poisonous Plant Stellera chamaejasme L. and Arbuscular Mycorrhizal Fungi on the Growth of Leymus Chinensis (Trin.) Tzvel

Zhu

Xing

et al. 2020

Microorganisms

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The growth of a large number of poisonous plants is an indicator of grassland degradation. Releasing allelochemicals through root exudates is one of the strategies with which poisonous plants affect neighboring plants in nature. Arbuscular mycorrhizal fungi (AMF) can form a mutualistic symbiosis with most of the higher plants. However, the manner of interaction between root exudates of poisonous plants and AMF on neighboring herbage in grasslands remains poorly understood. Stellera chamaejasme L., a common poisonous plant with approved allelopathy, is widely distributed with the dominant grass of Leymus chinensis in the degradeds of Northern China. In this study, we investigated the addition of S. chamaejasme root exudates (SRE), the inoculation of AMF, and their interaction on the growth and tissue nitrogen contents of L. chinensis, the characteristics of rhizosphere AMF, and soil physicochemical properties. Results showed that SRE had significant effects on ramet number, aboveground biomass, and total nitrogen of L. chinensis in a concentration dependent manner. Additionally, SRE had a significant negative effect on the rate of mycorrhiza infection and spore density of the AMF. Meanwhile, the addition of SRE significantly affected soil pH, electrical conductivity, available nitrogen (AN), available phosphorus (AP), total nitrogen (TN), and total carbon (TC) contents; while neither inoculation of AMF itself nor the interaction of AMF with SRE significantly affected the growth of L. chinensis. The interaction between AMF and SRE dramatically changed the pH, AP, and TC of rhizosphere soil. Therefore, we suggested SRE of S. chamaejasme affected the growth of L. chinensis by altering soil pH and nutrient availability. AMF could change the effect of SRE on soil nutrients and have the potential to regulate the allelopathic effects of S. chamaejasme and the interspecific interaction between the two plant species. We have provided new evidence for the allelopathic mechanism of S. chamaejasme and the regulation effects of AMF on the interspecific relationship between poisonous plants and neighboring plants. Our findings reveal the complex interplay between the root exudates of poisonous plants and rhizosphere AMF in regulating population growth and dynamics of neighboring plants in degraded grassland ecosystems.

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Section: Effects Of Root Exudates On L Chinensissupporting

confidence: 53%

Interaction Between Root Exudates of the Poisonous Plant Stellera chamaejasme L. and Arbuscular Mycorrhizal Fungi on the Growth of Leymus Chinensis (Trin.) Tzvel

Zhu

Xing

et al. 2020

Microorganisms

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“…-N and NH 4 NO 3 inputs (Liu and Greaver 2010). This reduction was attributed to the following mechanisms: (i) the toxicity effects caused by N enrichment, such as increasing osmotic pressure, soil acidity, and aluminum toxicity, offset the positive effects of increasing the labile C supply (Liu and Greaver 2010), and (ii) the limited resources for microbial communities shifted from C to water, phosphorus, or other resources (Liu and Greaver 2010;Zhang et al 2013). N addition tended to increase SMN, resulting in a decrease in the soil microbial C/N ratio in 2013 (Fig.…”

Section: Increases In Nhmentioning

confidence: 99%

Nitrogen Critical Loads for an Alpine Meadow Ecosystem on the Tibetan Plateau

Zong

Shi

Song

et al. 2015

Environmental Management

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Increasing atmospheric nitrogen (N) deposition has the potential to alter plant diversity and thus the function and stability of terrestrial ecosystems. N-limited alpine ecosystems are expected to be particularly susceptible to increasing N deposition. However, little is known about the critical loads and saturation thresholds of ecosystem responses to increasing N deposition on the Tibetan Plateau, despite its importance to ecosystem management. To evaluate the N critical loads and N saturation thresholds in an alpine ecosystem, in 2010, we treated an alpine meadow with five levels of N addition (0, 10, 20, 40, and 80 kg N ha -1 year -1 ) and characterized plant and soil responses. The results showed that plant species richness and diversity index did not statistically vary with N addition treatments, but they both changed with years. N addition affected plant cover and aboveground productivity, especially for grasses, and soil chemical features. The N critical loads and saturation thresholds, in terms of plant cover and biomass change at the community level, were 8.8-12.7 and 50 kg N ha -1 -year -1 (including the ambient N deposition rate), respectively. However, pronounced changes in soil inorganic N and net N mineralization occurred under the 20 and 40 kg N ha -1 year -1 treatments. Our results indicate that plant community cover and biomass are more sensitive than soil to increasing N inputs. The plant community composition in alpine ecosystems on the Qinghai-Tibetan Plateau may change under increasing N deposition in the future.

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“…P. australis has a superior competitive ability as compared to L. chinensis due to its high growth rate and the deep root system, whereas the roots of L. chinensis occur primarily within the 0-20 cm soil layer (Jiang et al, 2010). The strong competitive ability of P. australis makes it resistant to displacement or overgrowth (Zhang et al, 2013).…”

Section: Associations Between Species Distribution Patterns and Soil mentioning

confidence: 99%

Associations Between Species Distribution Patterns and Soil Salinity in the Songnen Grassland

Diabate

Gao

et al. 2014

Arid Land Research and Management

Self Cite

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The Songnen grassland is one of the grasslands in China characterized by concentrated heterogeneous patches of saline-alkaline soils. However, our understanding of how these patchy structures develop and how biochemical factors change within patches is limited. Thus, three representative semi-vegetated patches were selected and analyzed for soil electrical conductivity (EC), soil pH, soil organic matter (SOM), and soil nitrogen (N). Based on the different appearance and distribution of species, the patches were divided into a center, middle, and outer section. Our results showed that in contrast to EC, SOM significantly increased from the center to the outer section. Aboveground biomass and species distribution patterns were strongly associated with SOM and contrasted to EC. In the center section, the annual species Kochia scoparia (L.) Schrad represented more than 90% of the total biomass, whereas the perennial species Leymus chinensis (Trin.) Tzvel and Phragmites australis (Cav.) Trin. ex Steud were the most dominant species in the outer section with a contribution of more than 90% to the total biomass. In the middle section, most of the species achieved mutual coexistence and the perennial species appeared to benefit from the interspecific relationships with their neighbors. Our results suggest that a feasible means of restoration management for heterogeneous degraded grassland should be achievable through revegetation by species such as L. chinensis and P. australis, which improve soil organic matter and reduce EC.Salt stress is one of the most limiting abiotic factors for crop production. Approximately 954 million hectares of land worldwide are already salinized (Munns, 2002). Saline and alkaline soils (6.7 Â 10 6 ha) cover around 7% of the cultivated lands in China. Songnen plain, mainly used as mowing pasture and grazing fields, is about 60-70% salinized and alkalined with extremely high pH ranging from 9.0 to 10.5

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Effects of warming and nitrogen deposition on the coupling mechanism between soil nitrogen and phosphorus in Songnen Meadow Steppe, northeastern China

Cited by 88 publications

References 72 publications

Interaction Between Root Exudates of the Poisonous Plant Stellera chamaejasme L. and Arbuscular Mycorrhizal Fungi on the Growth of Leymus Chinensis (Trin.) Tzvel

Interaction Between Root Exudates of the Poisonous Plant Stellera chamaejasme L. and Arbuscular Mycorrhizal Fungi on the Growth of Leymus Chinensis (Trin.) Tzvel

Nitrogen Critical Loads for an Alpine Meadow Ecosystem on the Tibetan Plateau

Associations Between Species Distribution Patterns and Soil Salinity in the Songnen Grassland

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