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5 results for “tree water uptake”
Variability in tree water uptake determined with stable water isotopes in an African tropical montane forest
<p>Dataset supporting the study <strong>Variability in tree water uptake determined with stable water isotopes in an African tropical montane forest.</strong></p> <p>We investigated relative contributions of different soil depths to tree water uptake of 83 trees and possible species-specific differences in a 50x50 m forest plot at four dates in a tropical montane forest in Kenya using stable water isotopes and the Bayesian mixing model framework MixSIAR.</p> <p>The dataset contains raw isotope data of tree xylem, soil and throughfall water sampled on different dates in a tropical montane forest in Kenya as well as interpolated model input data for the Bayesian mixing model.</p> <p>Further information can be found in the soon to be published article in Ecohydrology.</p> <p> </p>
Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest – but not under nitrogen poor conditions
<p><span>Understanding how plant water uptake interacts with acquisition of soil nitrogen (N) and other nutrients is fundamental for predicting plant responses to a changing environment, but it is an area where models disagree.</span></p> <p><span>We present a novel isotopic labelling approach which reveals spatial patterns of water and N uptake, and their interaction, by trees. The stable isotopes <sup>15</sup>N and <sup>2</sup>H were applied to a small area of the forest floor in stands with high and low soil N availability. Uptake by surrounding trees was measured. The sensitivity of N acquisition to water uptake was quantified by statistical modelling.</span></p> <p><span>Trees in the high-N stand acquired twice as much <sup>15</sup>N as in the low-N stand and around half of their N uptake was dependent on water uptake (<sup>2</sup>H enrichment). In contrast, in the low-N stand there was no positive effect of water uptake on N uptake. </span></p> <p><span>We conclude that tree N acquisition was only marginally dependent on water flux toward the root surface under low N conditions but under high-N conditions, the water-associated N uptake was substantial. The results suggest a fundamental shift in N acquisition strategy under high-N conditions. </span></p>
Tree water uptake enhances nitrogen acquisition in a fertilized boreal forest – but not under nitrogen poor conditions
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Water uptake strategies by typical broadleaf and coniferous trees in the Loess Plateau mountain area of northern China
<p class="1">Poor precipitation in the Loess Plateau area may significantly influence water uptake strategies of the plants growing there. The water sources of these trees have not been studied to date. We investigated the impacts of precipitation (before and after) on water uptake strategies of typical broadleaf and coniferous trees in the Loess Plateau mountain area of northern China by using hydrogen and oxygen stable isotope techniques. Our results indicated that water sources of these two tree types varied before and after rainfall. <i>Robinia pseudoacacia</i>, a broadleaf tree, absorbed water majorly from the 30–40 cm (57.8%) soil layer before precipitation and from the 20–30 cm (58.5%) soil layer after precipitation. However, <i>Pinus tabuliformis</i>, a coniferous tree, mainly absorbed water from 20–30 cm (24.9%) and 10–20 cm (21.6%) soil layers before precipitation and from 0–10 cm (39.8%) and 10–20 cm (44%) soil layers after precipitation. Moreover, the herbaceous of broadleaf plant has higher complexity of the community through filed investigation. Thus, <i>R. pseudoacacia</i> and <i>P. tabuliformis</i> exhibited peculiar difference in terms of water uptake, indicating that they are suitable to grow together as forest vegetation in arid and semi-arid areas. Overall, our results provided vital information for sustainable afforestation management in the Loess Plateau mountain area of northern China.</p>
Water uptake strategies by typical broadleaf and coniferous trees in the Loess Plateau mountain area of northern China
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