Extremely low fine root biomass in Larix sibirica forests at the southern drought limit of the boreal forest

Chenlemuge, Tselmeg; Hertel, Dietrich; Dulamsuren, Choimaa; Khishigjargal, Mookhor; Leuschner, Christoph; Hauck, Markus

doi:10.1016/j.flora.2013.08.002

Cited by 34 publications

(19 citation statements)

References 56 publications

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“…Although root hydraulic and wood anatomical traits all differed significantly between Inner Asia and Europe, it is not very likely that a modified hydraulic architecture is a decisive element in the adaptation of L. sibirica to semiarid climate in Mongolia because Chenlemuge et al (2013) found very high fine root mortality in dry summer months in the studied stands. Apparently, the species forms fine roots with large-diameter conduits in moist periods with the disadvantage of high cavitation risk in subsequent drought periods for capturing the scarce water in rain periods as efficiently as possible.…”

Section: Discussionmentioning

confidence: 77%

“…at the southernmost fringe of the Eurosiberian forest in Inner Asia, although these forests receive only little and unreliable precipitation and are thus frequently affected by drought (Gunin et al 1999). It has been shown that water shortage reduces the stem wood production of these forests (De Grandpré et al 2011;Dulamsuren et al 2013) and is thought to cause high fine root mortality (Chenlemuge et al 2013). Recent climate warming has increased the limiting effect of summer drought on productivity (Dulamsuren et al 2010 and has resulted in tree mortality in certain regions (Liu et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Stem increment and hydraulic architecture of a boreal conifer (Larix sibirica) under contrasting macroclimates

Chenlemuge

Schuldt

Dulamsuren

et al. 2014

Trees

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Key message Hydraulic conductivity and wood anatomical traits in Larix sibirica are correlated with macroclimate, and growing season precipitation in particular, along a precipitation gradient of 700 mm year 21 . Abstract Empirical (K s ) and theoretical (K p ) sapwood area-specific hydraulic conductivity, hydraulically weighted (d h ) and simple (d) tracheid diameters as well as tracheid density (TD) in roots, stems, and branches were studied in Larix sibirica trees, the dominant conifer at the southern, drought-affected range limit of the boreal forest in Inner Asia. We compared the hydraulic architecture of L. sibirica in two stands in Mongolia to larch trees grown in Central Europe under moist conditions and related hydraulics to macroclimate (precipitation, temperature) and productivity (basal area increment, BAI). K s , K p , d h , and d correlated positively, and TD negatively with precipitation, temperature, and also BAI. Mean growing season precipitation (MGSP) seemed to affect the hydraulic traits more than temperature. A meta-analysis covering data of 14 conifer species from the northern hemisphere revealed a general relationship between MGSP and hydraulic traits. In contrast to expectation, K p and d h did not show a steady decline from roots through the stem to branches in L. sibirica, but were of similar size or larger in the stem. Our results suggest that considerable plasticity in the hydraulic architecture is an important element of the drought adaptation of L. sibirica. It combines with drought-induced fine root abscission (as reported from earlier work) which may help to protect larger roots and the stem from cavitation.

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Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Stem increment and hydraulic architecture of a boreal conifer (Larix sibirica) under contrasting macroclimates

Chenlemuge

Schuldt

Dulamsuren

et al. 2014

Trees

Self Cite

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“…Larch is one of the most sensitive tree species to climate change (Levesque et al 2013;Lei et al 2016;Kim et al 2017). The distribution, growth, reproduction and regeneration of Dahurian larch, Siberian larch, and European larch have all suffered from increased drought and are all known to be rather drought sensitive (Sidorova et al 2009;Dulamsuren et al 2010;Chenlemuge et al 2013). Paper birch and river birch (B. nigra L.) have been reported to have inherently low tolerance to drought (Ambebe and Dang 2010).…”

Section: Species-specific Responsementioning

confidence: 99%

“…Therefore, knowledge of species-and region-specific responses to climate is needed. Boreal forests have been found to be severely affected by climate change (Chenlemuge et al 2013;Ashraf et al 2015). Larches (Larix spp.)…”

Section: Introductionmentioning

confidence: 99%

“…in Central Europe (Levesque et al 2013), and Siberian larch (L. sibirica Ledeb.) in north-western Khentey, Mongolia (Dulamsuren et al 2010;Chenlemuge et al 2013) and in the South Siberian forest-steppe landscape (Anenkhonov et al 2015). Differences in the capacity of plants to withstand water deficits may exist among plants native to different climatic conditions (Levesque et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Comparative studies of the response of larch and birch seedlings from two origins to water deficit

Run-mei

Shi

Wang

2017

N.Z. j. of For. Sci.

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Background: Early developmental stages of plants are expected to be a major bottleneck to recruitment. Information on the response of seedling to anticipated water availability is urgently needed in regions where tree seedlings may experience more frequent water deficits. In this paper, we focused on the influence of water deficit on different species (larch vs. birch) and origins (xeric vs. mesic). Methods: Prince Rupprecht's larch (Larix gmelinii var. principis-rupprechtii (Mayr) Pilg.) and white birch (Betula platyphylla Sukaczev) from northern China were selected to represent the xeric origin. Eastern larch (Larix laricina (Du Roi) K. Koch) and paper birch (Betula papyrifera Marshall) from eastern Canada were selected to represent the mesic origin. For each species, half of seedlings were assigned to a well-watered treatment (WW, 75% water holding capacity (WHC) and the other half to a low-watered treatment (LW, 35% WHC). After 20 weeks of treatment, we collected data on morphological indexes of shoot height, root collar diameter, total leaf area and total root area; measured photosynthetic rate (A sat ), transpiration rate (E), photosynthetic water-use efficiency (WUE) and apparent chlorophyll concentration (Chl); harvested seedlings and measured biomass allocation of leaf, stem and root. Results: We found that reduced photosynthetic rate, transpiration rate and increased water-use efficiency were physiological responses of the four species to drought, and the responses varied among the species. All larch seedlings appeared no leaf shedding, survived through the drought treatment and showed a longer duration and high tolerance to drought. In low-watered conditions, survival rate, biomass, shoot height, root collar diameter, total leaf area, total root area and chlorophyll concentration of birch seedlings were significantly decreased. The response of seedlings to water deficits also differed according to the seed origins. Xeric origin of Prince Rupprecht's larch was more affected than mesic origin of eastern larch, mainly because Prince Rupprecht's larch originated in a narrower range of mountainous regions, resulting in lower adaptation of this species to water deficits, whereas eastern larch was distributed widely along coastal regions, contributing to higher phenotypic plasticity to variable soil conditions. Similarly, higher plasticity of paper birch may be responsible for its better performance in the low-watered treatment than white birch. Conclusions: Larch seedlings were less sensitive to water deficit than birch seedlings. Larch seedlings were characteristics of a conservative water-use strategy, whereas birch seedlings responded with a profligate water-use strategy. Plasticity or adaptation of seedlings outweighs the seed origins in determining their drought responses.

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Boreale Wälder und Moorgebiete

Hauck

Leuschner

Homeier

2019

Klimawandel Und Vegetation - Eine Globale Übersicht

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Extremely low fine root biomass in Larix sibirica forests at the southern drought limit of the boreal forest

Cited by 34 publications

References 56 publications

Stem increment and hydraulic architecture of a boreal conifer (Larix sibirica) under contrasting macroclimates

Stem increment and hydraulic architecture of a boreal conifer (Larix sibirica) under contrasting macroclimates

Comparative studies of the response of larch and birch seedlings from two origins to water deficit

Boreale Wälder und Moorgebiete

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