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Biomass of the stem and root sprouts at the four sprout cuts, as affected by the treatments C, not-cut controls; SL, stems cut and exposed to the light; SH, stems cut and covered; SPH, stem cut and the entire pot covered. Data are expressed as the mean ± standard error of six replicates. Fo each cut and parameter, different letters indicate statistical difference at p ≤ 0.05 using Tukey's test
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Ailanthus altissima is an invasive tree threatening the biodiversity in natural and disturbed habitats of temperate regions, primarily because of its high resprouting vigor. To test the effect of light exclusion on stem and root sprouting, black covers were applied on the cut stumps of 3-year-old saplings grown in pots. The treatments were as follo...
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Context 1
... sprout biomass was affected by treatments differently than the sprout numbe and, when present, the unit biomass of stem sprouts was higher than that of the roo sprouts because of their earlier emergence and generally lower number (Tables 2 and 3) At cut I, the unit biomass of the stem sprouts was more than double in SL than SH, which could be explained by both the longer period of development in SL, which was 131 day compared with 54 in SH, and the lower competition with root sprouts in SL. The biomas of root sprouts showed great variability between the replicate plants but, on average, both the total and unitary biomasses were higher in SH (Table 3). ...Context 2
... sprout biomass was affected by treatments differently than the sprout numbe and, when present, the unit biomass of stem sprouts was higher than that of the roo sprouts because of their earlier emergence and generally lower number (Tables 2 and 3) At cut I, the unit biomass of the stem sprouts was more than double in SL than SH, which could be explained by both the longer period of development in SL, which was 131 day compared with 54 in SH, and the lower competition with root sprouts in SL. The biomas of root sprouts showed great variability between the replicate plants but, on average, both the total and unitary biomasses were higher in SH (Table 3). Accordingly, the analysis o contrasts showed that the biomass of the root sprouts was higher in the SH treatmen compared with C+SL+SPH at cut I (Table 4). ...Context 3
... sprout biomass was affected by treatments differently than the sprout number and, when present, the unit biomass of stem sprouts was higher than that of the root sprouts because of their earlier emergence and generally lower number (Tables 2 and 3). At cut I, the unit biomass of the stem sprouts was more than double in SL than SH, which could be explained by both the longer period of development in SL, which was 131 days compared with 54 in SH, and the lower competition with root sprouts in SL. ...Context 4
... cut I, the unit biomass of the stem sprouts was more than double in SL than SH, which could be explained by both the longer period of development in SL, which was 131 days compared with 54 in SH, and the lower competition with root sprouts in SL. The biomass of root sprouts showed great variability between the replicate plants but, on average, both the total and unitary biomasses were higher in SH (Table 3). Accordingly, the analysis of contrasts showed that the biomass of the root sprouts was higher in the SH treatment compared with C+SL+SPH at cut I (Table 4). ...Context 5
... cut II, the stem sprouts were present only in SL and their total and unitary biomass were greatly reduced compared with cut I, while the root sprouts were produced only in SL and SPH, with approximately 3 g plant −1 in both (Table 3). Thus, at the end of the first growth season, the cumulative biomass of the sprouts was significantly higher in the cut stems exposed to the light (43.8 g plant −1 ) than in the other treatments, in which it was 12.4 g plant −1 in SH, 4.2 g plant −1 in SPH, and only 0.06 g plant −1 in the control plants. ...Context 6
... treatments also differed in the partitioning of the biomass within the stem and root sprouts, as over 90% of the biomass was allocated in the stem sprouts in SL and 35% in SH, while SPH and C produced root sprouts only. Table 3. Biomass of the stem and root sprouts at the four sprout cuts, as affected by the treatments. ...Context 7
... cut III, the biomass of the root sprouts did not differ significantly between the treatments, but the analysis of contrasts highlighted that it was higher in SL compared with the other treatments (Table 4). At cut IV, only SL and SPH produced root sprouts, with approximately 1 g plant −1 in both (Table 3). As in the first growth season, also in the second, the cumulative biomass of the sprouts was significantly higher in the cut stems exposed to the light (8.1 g plant −1 ), followed by SPH, with 5.1 g plant −1 , and by the controls, with 0.6 g plant −1 , while the SH plants did not produce any sprout over the entire growth season. ...