Response of Populus tremula to heterogeneous B distributions in soil

Rees, Rainer; Robinson, Brett; Evangelou, Michael W.H.; Lehmann, Eberhard; Schulin, Rainer

doi:10.1007/s11104-012-1183-x

Cited by 4 publications

(3 citation statements)

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“…Some authors argued that the heterogenous pattern caused more photosynthetic products to be partitioned to underground organs, which lowered the growth of above-ground organs. However, another study on poplar stocks revealed that shoot growth was increased or unchanged in the heterogeneous pattern relative to the homogeneous pattern of Boron supply [ 50 ]. This was caused by the tradeoff between adjusting Boron deficiency and toxicity by signals within whole-plant cycling.…”

Section: Discussionmentioning

confidence: 99%

Root Foraging Precision of Pinus pumila (Pall.) Regel Subjected to Contrasting Light Spectra

Gao

Zhao

et al. 2021

Plants

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Root foraging behavior in heterogeneous patterns of soil nutrients is not well understood for undergrowth in alpine forests, where light spectra may generate an interactive effect on root foraging precision. A dwarf alpine species, Pinus pumila (Pall.) Regel., was cultured in pots where nitrogen (N)–phosphorus (P)–potassium (K) nutritional granules (N–P2O5–K2O, 14–13–13) were added to both halves of an inner space at a rate of 67.5 mg N (homogeneous) or 135 mg N to a random half (heterogeneous). Potted seedlings were subjected to either a green-and-blue light spectrum with a red-to-green light ratio of 4.24 (15.3% red, 64.9% green, and 19.8% blue) or a red-light enriched spectrum (69.4% red, 30.2% green, and 0.4% blue) both at irradiations of 200.43 µmol m−2 s−1. The root foraging precision was assessed by the difference in the fine root morphology or weight between the two halves. The foraging precision was assessed by both fine root length and surface area and was promoted in seedlings subjected to the heterogeneous pattern in the red-light enriched spectrum. Seedlings subjected to the green-and-blue light spectrum showed lower shoot growth, biomass, and root morphology but had higher shoot and root N and P concentrations. The heterogenous pattern resulted in greater seedling growth and fine root morphology as well as N and P concentrations compared to the homogeneous pattern. We conclude that P. pumila has a strong ability to forage nutrients in heterogenous soil nutrients, which can be further promoted by a spectrum with higher red-light proportions.

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Section: Discussionmentioning

confidence: 99%

Root Foraging Precision of Pinus pumila (Pall.) Regel Subjected to Contrasting Light Spectra

Gao

Zhao

et al. 2021

Plants

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“…The field of view for the neutron beam was 185*185 mm with an image resolution of about 200 μm. To cover the whole sample (with size of 250 * 300 mm), four individual radiographs with slight overlaps were taken and then stitched together, similar to Rees et al (2012) by ImageJ plugin 'Mosaic' (http://mosaic.mpi-cbg.de/?q=downloads/imageJ).…”

Section: Water Treatment Of Samplesmentioning

confidence: 99%

Mapping compensating root water uptake in heterogeneous soil conditions via neutron radiography

et al. 2015

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Background and aims Water is often heterogeneously distributed in soils. Understanding roots' responses to this soil-water heterogeneity is a key parameter defining plant survival in dry climates. To determine local root water uptake for partly dry conditions in a plant's root system, we prepared soil patches with different water contents, then used neutron radiography to monitor daily changes in root structure and water uptake. Methods Lupin plants were grown in 30×25×1 cm 3 aluminum containers filled with sandy soil. In two partitioning set-ups, the soil-root zone was divided into either two or nine hydraulically-isolated soil compartments. This was done by packing layers of coarse sand as capillary barriers, by which vertical and/or horizontal soil water heterogeneity as well as homogeneous wellwatered treatments were applied for control. Daily changes in soil water content in each compartment, water uptake and root growth were monitored noninvasively and quantified by neutron radiography during a period of 15 consecutive days. Results In optimal homogeneously-wet soil, lateral roots in the top 10 cm of the root system showed the highest water uptake rate, up to around 10 mg/(mm. root. day), which on average was twice as much as that for younger lateral roots in lower position and taproot. In heterogeneous treatments, root water uptake declined strongly in compartments with the soil water content below 0.13-0.10 cm 3 /cm 3 while in parallel an enhanced uptake rate, rising by up to 100 %, was observed for the roots in wet compartments, presumably to compensate for roots in dry compartments and, therefore, sustain the total transpiration. Also, our observations showed that in the drying compartment a reduction of soil water content to 0.10-0.15 triggered local cluster root formation. Conclusions With the experimental set-up presented the pattern of water uptake across a lupin root system can be quantified and normalized to root length. Water uptake was shown to be highly variable in different parts of the root system. A threshold for water stress to cause cessation of local water uptake was identified, and the considerable amount of compensation by water uptake in other parts identified. The dynamic trade-off among different parts of the root system seems to regulate total root uptake also during water stress to sustain the daily transpirational demand. Plant Soil

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“…Not only trace elements but also other soil factors influencing root traits and morphology, such as water, air or macronutrients, often show quite heterogeneous distribution patterns (Hodge, 2010). Under well-defined conditions, poplar root growth was shown to be inhibited in soil patches with B concentrations >20 mg kg -1 (Rees et al, 2012), but there are no studies on the response of poplar roots to a spatially heterogeneous distribution of soil B under field conditions.…”

Section: Introductionmentioning

confidence: 99%

Boron accumulation and tolerance of hybrid poplars grown on a B-laden mixed paper mill waste landfill

Rees

Robinson

Rog³

et al. 2013

Science of The Total Environment

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Paper mill wastes are a mixture of by-products from pulp production and on-site energy production, consisting of paper mill sludge, ash and cinders. Landfilling of these highly boron (B) and heavy metal laden waste products carries environmental risks. Poplars have been successfully employed in the phytomanagement and hydraulic control of B contaminated sites. Here, we assess the performance of hybrid poplars on a paper-mill waste landfill, investigate the accumulation of B by the trees and explore the relationship between local-scale root growth and substrate properties. Leaf and root tissue samples were collected on three plots and analyzed for their chemical properties and root traits. Additionally, we sampled four soil cores in the vicinity of each of the trees and determined chemical and physical properties. Using a principal component analysis followed by a cluster analysis, we identified three substrate types. This method delineated the soil effects on tree survival and growth, although correlations with individual soil element concentrations were weak. Despite signs of B toxicity in some leaves, B was not the key limiting factor for poplar growth. Instead, Ca deficiency caused by a Mg:Ca imbalance was the primary reason for the poor performance of some trees. Root growth was not limited by toxicity effects of soil contaminants. Our results show that hybrid poplars perform well under the harsh growing conditions on a multi-contaminated, B-laden substrate in a hemiboreal climate. Exploiting the differences in the performance of the four clones in relation to the soil types, could increase the success of revegetation on this and other landfills.

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Response of Populus tremula to heterogeneous B distributions in soil

Cited by 4 publications

References 61 publications

Root Foraging Precision of Pinus pumila (Pall.) Regel Subjected to Contrasting Light Spectra

Root Foraging Precision of Pinus pumila (Pall.) Regel Subjected to Contrasting Light Spectra

Mapping compensating root water uptake in heterogeneous soil conditions via neutron radiography

Boron accumulation and tolerance of hybrid poplars grown on a B-laden mixed paper mill waste landfill

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