Response of germination and seedling survival of two shrubs to simulated dry-wet treatments

doi:10.11686/cyxb2022493

Abstract

Abstract:

Caragana korshinskii and Corethrodendron scoparium are two typical xeriscape shrubs widely used in ecological construction in arid and semi-arid areas. Differences in precipitation intensity and interval profoundly affect germination and seedling survival， and the two processes are key factors limiting vegetation natural regeneration. In this study， the effects of dry-wet treatments on C. korshinskii and C. scoparium germination and seedling survival were examined using standard procedures. It was found that， compared to CK， only C. korshinskii germination was significantly affected by dry-wet treatments. The best treatments increased germination of C. korshinskii at day 1 by 27.99% （P<0.05）， and of C. scoparium at day 2 by 46.88% （P<0.05）. Compared to C. korshinskii， the revival rate of young C. scoparium seedlings after rehydration was higher. Yong seedlings of C. korshinskii and C. scoparium with root length of 0-0.2 cm desiccated up to 45 days revived after rehydration. The points of no return of young C. korshinskii and C. scoparium seedlings of 0.5-1.0 cm root length were 21 and 45 days， respectively. At a root length of 1.0-1.5 cm， the points of no return were 7 and 14 days， respectively. In summary， the hydration/dehydration treatments were beneficial to germination， but the tolerance to desiccation decreased with the growth of seedlings. In general， the adaptation of C. scoparium to desiccation was stronger than that of C. korshinskii. We suggest that more use of shrubs such as C. scoparium can be made to fix sand as part of response to climate change in the study area， so as to improve the relative stability of artificial vegetation.

Key words: Tengger desert, seed germination, seedling survival, dry-wet treatments, Caragana korshinskii, Corethrodendron scoparium

Wen-jie QU, Wen-zhi ZHAO, Lei WANG, Jian-jun QU, Xin-guo YANG. Response of germination and seedling survival of two shrubs to simulated dry-wet treatments[J]. Acta Prataculturae Sinica, 2023, 32(11): 179-187.

Figures/Tables 5

Table 1 Seed morphological indexes of C. korshinskii and C. scoparium （mean±SD）

物种

Species

长

Length （mm）

宽

Width

（mm）

面积

Area

（mm²）

周长

Perimeter （mm）

直径

Diameter

（mm）

长宽比

Length/width

圆度

Circularity

千粒重

Thousand seed weight （g）

Fig.1 Effects of wet-dry treatment on seed germination of C. korshinskii and C. scoparium

Fig.2 Effects of wet-dry treatments on seed germination process of C. korshinskii and C. scoparium

Fig.3 Effects of different durations of drought on the survival rate of young seedlings with different root lengths

Fig.4 Seedling revival days at different root length and different drying treatments

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