Seasonal water use by Larix principis-rupprechtii in an alpine habitat

Zhang, Yiping; Jiang, Yuan; Wang, Biao; Jiao, Liang; Wang, Mingchang

doi:10.1016/j.foreco.2017.11.009

Cited by 31 publications

(17 citation statements)

References 52 publications

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“…Our isotopic evidence of water‐use pattern for Pinus tabulaeformis in a semi‐arid forest stand illustrated that there is no marked shift in seasonal water uptake from different soil layers throughout the whole growing‐season (May‐September), with trees using nearly equal proportion of soil water from shallow, middle, and deep soil layers (Figure ). Our findings are consistent to result from a mountain forest stand in temperate northern China (Zhang, Jiang, Wang, Jiao, & Wang, ). These results indicate a weak adaptive ability for trees to cope with potential seasonal variations in soil water supply, interacted by winter hydrological processes and the monsoon system.…”

Section: Discussionsupporting

confidence: 91%

Uneven winter snow influence on tree growth across temperate China

Liu

et al. 2018

Global Change Biology

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Winter snow is an important driver of tree growth in regions where growing‐season precipitation is limited. However, observational evidence of this influence at larger spatial scales and across diverse bioclimatic regions is lacking. Here, we investigated the interannual effects of winter (here defined as previous October to current February) snow depth on tree growth across temperate China over the period of 1961–2015, using a regional network of tree ring records, in situ daily snow depth observations, and gridded climate data. We report uneven effects of winter snow depth on subsequent growing‐season tree growth across temperate China. There shows little effect on tree growth in drier regions that we attribute mainly to limited snow accumulation during winter. By contrast, winter snow exerts important positive influence on tree growth in stands with high winter snow accumulation (e.g., in parts of cold arid regions). The magnitude of this effect depends on the proportion of winter snow to pre‐growing‐season (previous October to current April) precipitation. We further observed that tree growth in drier regions tends to be increasingly limited by warmer growing‐season temperature and early growing‐season water availability. No compensatory effect of winter snow on the intensifying drought limitation of tree growth was observed across temperate China. Our findings point toward an increase in drought vulnerability of temperate forests in a warming climate.

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Section: Discussionsupporting

confidence: 91%

Uneven winter snow influence on tree growth across temperate China

Liu

et al. 2018

Global Change Biology

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“…pre‐event water). Thus, sampling root‐zone and xylem water before and after events enables us to see whether recent water is taken up by the plant roots (Oerter & Bowen, 2017; Zhang, Jiang, Wang, Jiao, & Wang, 2018).…”

Section: Looking Forward: Designing Useful Experiments Given Endmembementioning

confidence: 99%

Plant and root‐zone water isotopes are difficult to measure, explain, and predict: Some practical recommendations for determining plant water sources

et al. 2020

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1. Stable isotope ratios of water (δ 18 O, δ 2 H) have long been used to study a core question in plant ecology and ecohydrology: 'From where do plants take up water?' Indeed, decades of research has involved sampling potential plant water sources in the subsurface, classifying those sources as distinct endmembers (e.g. deep vs. shallow soil waters) and then evaluating their contributions to a xylem water sample through mixing-model analysis to identify the depths of root water uptake. 2. However, more detailed interrogations of the subsurface and plant domains have revealed under-considered transport and isotopic fractionation phenomena. These now apparent complexities raise new questions and challenge the many past assumptions inherent in endmember-mixing models that now seem overly simple. 3. Here, we introduce discussions of these recent insights and provide an overview of isotope effects that occur naturally in the root zone and in the plant, as well as artificially during sample handling. Better accounting for these complexities and their associated uncertainties can lead to more accurate and robust study designs, analytical frameworks and, ultimately, inferences. 4. Finally, to more robustly characterize plant water sources using δ 18 O and δ 2 H, we provide some practical recommendations that aim at maximizing the isotopic contrast between endmembers and/or minimizing potential uncertainties. K E Y W O R D S ecohydrology, endmember-mixing models, plant water uptake, review, root zone, stable water isotopes, uncertainties 1 | INTRODUC TION AND MOTIVATION Plant water use can represent up to 90% of terrestrial evapotranspiration (Jasechko et al., 2013), and therefore is an important driver of the global water cycle (Sellers et al., 1997). Because plant water relations are closely linked to carbon and nutrient relations (Schulze, 1982), understanding plant water supplies is also key to predict global carbon and nutrient cycles (Lange, Kappen, | 1353 Methods in Ecology and Evoluঞon von FREYBERG Et al. How to cite this article: von Freyberg J, Allen ST, Grossiord C, Dawson TE. Plant and root-zone water isotopes are difficult to measure, explain, and predict: Some practical recommendations for determining plant water sources.

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“…Secondary growth was monitored on the same dates and in the same trees as the bud phenology was measured. Each time, five microcores per tree were collected from stems at breast height (1.3 m) using a Trephor tool [31]. These microcores were then prepared in the laboratory and cut using a microtome to obtain a thin slice (6-10 μm thickness).…”

Section: Secondary Growthmentioning

confidence: 99%

Comparing Primary and Secondary Growth of Co-Occurring Deciduous and Evergreen Conifers in an Alpine Habitat

Zhang

Jiang

Yan

et al. 2019

Forests

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Investigations on primary and secondary growth in co-occurring species will aid in assessment of the physiological adaptation of species and the prediction of forest stand structure dynamics. To explore the correlation and coordination between primary and secondary growth, we monitored the leaf phenology, shoot elongation, and stem growth of co-occurring Larix principis-rupprechtii Mayr. and Picea meyeri Rehd. et Wils. in an alpine habitat, Luya Mountain (North-Central China), during the growing season of 2014. We measured bud development on terminal branches three days per week by direct observations and intra-annual stem xylem formation at weekly intervals by the microcores method. The onset sequence of three organs was the needle, shoot, and stem, without species-specific differences. Needles appeared one month earlier than stem growth in larch, while it was only one week earlier in spruce. The duration of needle growth was the shortest, followed by the shoot and stem. The timing of primary growth (i.e., onset, end, and maximum growth rate) between the two species was asynchronous, but secondary growth was synchronic with the same date of the maximum growth rate occurrence, potentially indicating species competition for resources. Unlike larch, spruce staggered growth peaks among different organs, which may effectively mitigate trees’ internal competition for resources. Soil temperature was positively correlated with both shoot and stem growth in the two species, whereas air temperature and soil water content were positively correlated with needle growth only in larch. Therefore, it can be inferred that the spruce will probably outcompete the larch at cold alpine treeline sites due to its high adaptability to acquiring and allocating resources. These results provide insight into the potential physiological correlation between primary and secondary growth and allow better prediction of future climate change effects on forest ecosystem productivity.

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Seasonal water use by Larix principis-rupprechtii in an alpine habitat

Cited by 31 publications

References 52 publications

Uneven winter snow influence on tree growth across temperate China

Uneven winter snow influence on tree growth across temperate China

Plant and root‐zone water isotopes are difficult to measure, explain, and predict: Some practical recommendations for determining plant water sources

Comparing Primary and Secondary Growth of Co-Occurring Deciduous and Evergreen Conifers in an Alpine Habitat

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