Nutrient levels within leaves, stems, and roots of the xeric species <i>Reaumuria soongorica</i> in relation to geographical, climatic, and soil conditions

He, Mingzhu; Zhang, Ke; Tan, Huijuan; Hu, Rui; Su, Jieqiong; Wang, Jin; Huang, Lei; Zhang, Yafeng; Li, Xinrong

doi:10.1002/ece3.1441

Cited by 84 publications

(60 citation statements)

References 63 publications

(174 reference statements)

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“…Kobresia pygmaea ) might lead to lower C contents at the community level. Additionally, the leaf/ stem ratio may be also relevant because C content may be higher in stems than in leaves for xeric species (He et al, ). Our samples were not exclusively from leaves, and heavy grazing might have reduced the share of stems and led to a lower average C content.…”

Section: Discussionmentioning

confidence: 99%

Environmental controls override grazing effects on plant functional traits in Tibetan rangelands

2019

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Plant functional traits are key to predict community responses to abiotic and biotic disturbances. Grazing is the dominant land‐use form in drylands and alpine environments, especially in Central Asian rangelands. Here, we address grazing effects and their relative importance against environmental controls on plant traits. We sampled 14 plant functional traits, which are potentially sensitive to grazing, from 127 taxa distributed across three grassland types in Tibetan grasslands exposed to increasing levels of precipitation: steppe, steppe‐meadow and meadow. We performed principal components analysis and fourth‐corner analysis to explore the impacts of grazing and environment on multiple community‐weighted mean (CWM) traits. We also used generaliszed linear mixed models to test the effects of grazing and environment on each CWM trait, and on three dimensions of functional trait diversity, i.e. functional richness (FRic), evenness (FEve) and divergence (FDiv). In addition, we undertook a mini‐review of former studies on grazing effects on plant traits in Chinese grasslands. We found that CWM traits were mainly affected by climate and elevation rather than by grazing intensity. Only plant tissue C content was negatively affected by intensified grazing across grassland types. Plant growth form and life form were mainly influenced by elevation, while heights of canopy and inflorescence were controlled by temperature. Specific leaf area was positively correlated with precipitation and soil total N content in steppes, while plant tissue N content was only correlated to livestock dung cover. Regarding functional trait diversity, FDiv in steppe‐meadows and meadows, and FEve in meadows were reduced by grazing. Synthesis. Our results confirmed that environmental controls override grazing impact on CWM traits across Tibetan alpine grasslands. Most plants and their respective traits are adaptive to alpine climates as well as to grazing, and are thus hardly affected by locally intensified grazing intensity. In steppes, functional diversity is insensitive to grazing due to the combined stress of drought and grazing. However, in steppe‐meadows and meadows, grazing may affect ecosystem functioning, as shown by the reduced values of FDiv and FEve under more intense grazing. A free Plain Language Summary can be found within the Supporting Information of this article.

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Section: Discussionmentioning

confidence: 99%

Environmental controls override grazing effects on plant functional traits in Tibetan rangelands

2019

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“…One possible reason for this inconsistency of the increase of plant nutrients and the decrease of plant growth with increased Al 3+ concentrations might be related to the plant morphology or nutrient dilution effects (Jarrell & Beverly, 1981). The plant growth was severely limited at 1100 mg/kg Al 3+ , where more leaves rather than stems were relatively formed for small plants, resulting in relatively higher amounts of nitrogen content (He et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

The Efficiency of Arbuscular Mycorrhizal Fungi in Promoting Alfalfa Growth in Acid Soils

Huang¹,

He²,

Guo³

2017

JAS

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High concentrations of soil Al 3+ in acid soil severely influence the growth of Medicago sativa (alfalfa). The objective of the current study was to analyze whether Arbuscular Mycorrhizal Fungi (AMF) inoculation could improve alfalfa growth in acid soils. A two-way completely randomized factorial design was employed for M. sativa and M. lupulina (black medick) with two inoculations (rhizobia and AMF) and three Al 3+ levels, and replicated four times. The soil Al 3+ levels were adjusted to 900 mg/kg, 1000 mg/kg and 1100 mg/kg. Spores of AMF were isolated directly from rhizosphere soils of black medick. The rhizobia were isolated from root nodules in fields separately from two plant species. At each Al 3+ level, there were four inoculations, non-inoculation, AMF solely, rhizobia solely and dual-inoculation with AMF and rhizobia. Soil Al 3+ concentration significantly limited above-and below-ground growth of both alfalfa and black medick, reducing plant height, branching number, shoot and root weight, and root length, surface area and volume. Compared to rhizobia, AMF showed a higher tolerance to soil Al 3+ . AMF inoculation increased the shoot and root weight of both plant species under most circumstances. Overall, AMF colonization had a trend in increasing the contents of phosphorus in both plant species at all Al 3+ concentrations but not nitrogen and potassium. Dual inoculation significantly increased nodulation ability, enabling both plant species to form nodules at 900 and 1000 mg/kg Al 3+ . Though the soil Al 3+ concentration influenced the efficiency of AMF inoculation, AMF inoculation improved nodulation, increased plant growth and nutrient uptake, suggesting that it was an alternative way in improving alfalfa growth in acid soils.

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“…Changes in the allocation patterns among organs were also responsible for shifts in minerals concentrations in water-stressed plants, with special impact on N, P, K, S and B. The nutrient allocation reflects the balance between the capacity to obtain, transport and store nutrients [57], being also dependent on where and how nutrients are used by the plant, and whether this pattern is changed under atypical conditions [58]. In this way, the different allocation patterns suggest a selective behavior according to the plant needs, as presented below.…”

Section: Aba Pre-treatment Modulates Olive Tree Ionome After Successimentioning

confidence: 99%

Foliar Pre-Treatment with Abscisic Acid Enhances Olive Tree Drought Adaptability

Brito

Dinis

Ferreira

et al. 2020

Plants

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Water is the most widely limiting factor for plants distribution, survival and agricultural productivity, their responses to drought and recovery being critical for their success and productivity. Olea europaea L. is a well-adapted species to cyclic drought events, still at considerable expense of carbon reserves and CO 2 supply. To study the role of abscisic acid (ABA) as a promoter of drought adaptability, young potted olive trees subjected to three drought-recovery cycles were pre-treated with ABA. The results demonstrated that ABA pre-treatment allowed the delay of the drought effects on stomatal conductance (g s ) and net photosynthesis (A n ), and under severe drought, permitted the reduction of the non-stomatal limitations to A n and the relative water content decline, the accumulation of compatible solutes and avoid the decline of photosynthetic pigments, soluble proteins and total thiols concentrations and the accumulation of ROS. Upon rewatering, ABA-sprayed plants showed an early recovery of A n . The plant ionome was also changed by the addition of ABA, with special influence on root K, N and B concentrations. The improved physiological and biochemical functions of the ABA-treated plants attenuated the drought-induced decline in biomass accumulation and potentiated root growth and whole-plant water use efficiency after successive drought-rewatering cycles. These changes are likely to be of real adaptive significance, with important implications for olive tree growth and productivity.Olive tree (Olea europaea L.) is a woody species which grows under the typical Mediterranean semi-arid conditions, a region already affected by multiple environmental constraints factors, and particularly susceptible to climate change, being expected higher temperatures and shifts in the precipitation patterns, leading to higher evaporative demand and lower soil water availability [4]. Although olive is a crop well-adapted to harsh conditions, water deficit has negative repercussions on water relations, carbon assimilation, oxidative pathways, nutrient uptake and biomass accumulation [1,[5][6][7][8][9][10]. Moreover, the adaptation mechanisms adopted by this species against drought stress are activated at the expense of carbon reserves and may be detrimental with the increased duration and intensity of stress. The increasing consciousness regarding the nutritional value of olive oil has enhanced the demand for this product and, thus, it is crucial to increase olive trees ability to conserve and use the scarce available water and the low and unexpected rainfall during the summer season.Abscisic acid (ABA) is a well-known plant stress hormone, being assumed as a potential mediator for induction of drought tolerance in plants [2]. Under drought, ABA elicits two distinct responses, where the earliest and most rapid is stomatal closure, which minimizes the water loss through transpiration. Further, ABA gradually increases hydraulic conductivity and promotes root cell elongation, enabling the plant to recover, and inducing the a...

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Nutrient levels within leaves, stems, and roots of the xeric species Reaumuria soongorica in relation to geographical, climatic, and soil conditions

Cited by 84 publications

References 63 publications

Environmental controls override grazing effects on plant functional traits in Tibetan rangelands

Environmental controls override grazing effects on plant functional traits in Tibetan rangelands

The Efficiency of Arbuscular Mycorrhizal Fungi in Promoting Alfalfa Growth in Acid Soils

Foliar Pre-Treatment with Abscisic Acid Enhances Olive Tree Drought Adaptability

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