3.2.3. CO2 assimilation (Pn) and chlorophyll content
The effects of SS on photosynthetic parameters are shown in
Fig. 5. Pn increased significantly with increasing SS application
rates; the average increases relative to the control were 30% and
47% in 30S and 60S plants, respectively. In contrast, the stomatal
conductance (Gs) and intercellular CO2 (Ci) levels decreased
significantly compared to the control plants except for Gs
measured in September, which increased compared to the control.
Furthermore, Pn decreased during the June–September campaign
by 39%, 36% and 35% in larch grown with the 0S, 30S and 60S
treatments, respectively. The Chlorophyll a contents increased
significantly in the needles of the larch grown in SS-amended soil
compared to those grown in unaltered soil. The Chlorophyll a
contents were 53% and 54% higher in 30S and 60S plants,
respectively, compared to 0S plants (Fig. 6). The Chlorophyll a
remained constant; no differences between the treatments were
detected.
3.2.3. CO2 assimilation (Pn) and chlorophyll content
The effects of SS on photosynthetic parameters are shown in
Fig. 5. Pn increased significantly with increasing SS application
rates; the average increases relative to the control were 30% and
47% in 30S and 60S plants, respectively. In contrast, the stomatal
conductance (Gs) and intercellular CO2 (Ci) levels decreased
significantly compared to the control plants except for Gs
measured in September, which increased compared to the control.
Furthermore, Pn decreased during the June–September campaign
by 39%, 36% and 35% in larch grown with the 0S, 30S and 60S
treatments, respectively. The Chlorophyll a contents increased
significantly in the needles of the larch grown in SS-amended soil
compared to those grown in unaltered soil. The Chlorophyll a
contents were 53% and 54% higher in 30S and 60S plants,
respectively, compared to 0S plants (Fig. 6). The Chlorophyll a
remained constant; no differences between the treatments were
detected.
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