Al Hayek et al. - DataArchiving

Al Hayek et al. - DataArchivin

Relationship between micro-topography and frequency of emergence in sown areas.

<p>a) The proportion of microsites where emergence occurred in spring 2010 (first census) is shown relative to micro-topographic classes. The overall significance of the mixed logistic regression is shown in the upper right-hand corner (**, P<0.01). Different lowercase letters indicate difference between micro-topographic classes (P<0.05). Symbols next to these letters indicate the significance of the difference with the pit class (**, P<0.01; *, P<0.05; °, P<0.1). b) For each of the 5 censuses made in 2010 (see number in brackets), the standardised difference between the proportion of micro-pits where emergence occurred and the mean proportion of emergence for all microsites is regressed as a function of the Seasonal Water Availability Index. Values above and below zero indicate higher and lower proportion of emergence in micro-pits, respectively. The line shows the adjustment by a polynomial function of order 2. c) The evolution of the proportion of microsites with no emergence during the course of the study is shown relative to micro-topographic classes. The overall significance of the mixed Cox proportional hazard model is shown in the upper right-hand corner (***, P<0.001). Different lowercase letters indicate difference between micro-topographic classes (P<0.05).</p

Size of the main cohorts of seedlings (cohorts n° 1 to 7) and their contribution to total recruitment, their respective proportion of deads, proportion of recruits, and non-recruited seedlings.

<p>Different lowercase letters indicate significant differences in the proportions measured between cohorts (P<0.05).</p><p>Size of the main cohorts of seedlings (cohorts n° 1 to 7) and their contribution to total recruitment, their respective proportion of deads, proportion of recruits, and non-recruited seedlings.</p

Effect of P fertilisation on seedlings survival.

<p>Significance of the P-fertilisation treatment is shown (**, P<0.01; *, P<0.05). <b>a)</b> Seedling mortality is shown for the interval of time following emergence at different seasons. The corresponding period and cohort number are indicated at the bottom of the figure. Seasonal Water Availability Index (SWAI) is shown on the top. <b>b)</b> and <b>c)</b> Results of mixed survival Cox modelling is shown for the same cohort of seedlings. Panels b and c correspond to the second and sixth cohort, as in panel a.</p

Number of different demographic events observed during the course of the study in relation to meteorological conditions and vegetation growth in the experimental stand.

<p>The 12 censuses made are indicated by a thick mark on the time axis. <b>a)</b> Monthly variation in temperature and rainfall (1 unit on the left y-axis equivalent to 1°C for the solid black temperature line, or 2 mm for rainfall histograms). The black shaded areas represent periods of water deficit risk. The evolution of the area of the stand covered by vegetation (right y-axis) is represented by dotted (no fertilisation) and dashed (fertilisation) lines. <b>b)</b> Number of new seedlings observed in the 72 quadrats (no seedling emergence occurred in December and January during the coldest period). <b>c)</b> Number of deaths. <b>d)</b> Number of new plants successfully recruited. <b>e)</b> The cumulated number of emergences is shown by the upper line. The cumulated number of deaths is shown by the lower black shaded area. The surviving plants are shared between the recruits (light grey area with diagonal lines-area) and the seedlings (white area with diagonal lines).</p

The effects of neighbouring vegetation around microsites on seedling survival following emergence.

<p>Significance of the effect of vegetation development classes is shown (**, P<0.01; *, P<0.05). These classes of vegetation development are based on the seedling vegetation development index at emergence. Lowercase letters indicate a significant difference between classes (P<0.05). Seedling survival is shown for the interval of time following emergence at different seasons. The corresponding period and cohort number are shown on the x axis. The corresponding Seasonal Water Availability Indices (SWAI) are shown at the top.</p

Seedling growth in relation to the development of the neighbouring vegetation in the microsite for the first cohort (a) and the fifth cohort (b), in fertilised plots.

<p>Seedlings were grouped into three classes of vegetation development based on the average values over all observations of the corresponding microsites. In a) the overall significance of the model is shown on the lower right-hand corner (***, P<0.001). Different lowercase letters indicate significant differences of height between different classes of seedlings (P<0.05). Almost no growth occurred from census 4 to 6 (autumn-winter time) and the corresponding period was withdrawn from analysis to linearise the relationship of growth with time (see the shaded area on the time axis). Note the different scales on the y-axis in a) and b).</p

Variations of the rate of symbiotic nitrogen fixation (%N_dfa) with the year of study and P fertilisation each year.

<p>Information given in brackets indicates the result of the ANOVA in the whole sample (***, P<0,001). Different lowercase letters indicate only marginal differences (P<0.1) between classes performing within-year tests.</p><p>Variations of the rate of symbiotic nitrogen fixation (%N_dfa) with the year of study and P fertilisation each year.</p

Piston_et_al_2018_Data.zip

All data used to assess whether two contrasted canopy phenotypes (tight and loose) of the shrub Cytisus galianoi differed in their effects on the microhabitat and on subordinate plant community composition in a dry subalpine system. We also experimentally distinguished the relative contribution of above- (canopy) and below-ground (soil) effects of C. galianoi on the most frequent subordinate species, Festuca indigesta, as well as the reciprocal effects of F. indigesta on C. galianoi

Qilian Shan

Excel data file with the data from the Qilian Shan study site