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Effects of soil water conditions on seedling regeneration in Myricaria laxiflora remnant populations
Ecological Research ( IF 1.7 ) Pub Date : 2020-02-26 , DOI: 10.1111/1440-1703.12100 Shoupeng Guan 1 , Fangqing Chen 1 , Kun Lv 1 , Jumei Zhou 1 , Yongwen Huang 1
Ecological Research ( IF 1.7 ) Pub Date : 2020-02-26 , DOI: 10.1111/1440-1703.12100 Shoupeng Guan 1 , Fangqing Chen 1 , Kun Lv 1 , Jumei Zhou 1 , Yongwen Huang 1
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Remnant populations of Myricaria laxiflora are degrading due to difficulties in regeneration. To uncover the critical factors that hinder the regeneration of M. laxiflora populations, the present study examined seed persistence, seed germination and seedling survival and growth under different soil water contents and groundwater levels. Results revealed that seed viability significantly decreased with prolonged storage time. The germination rate of seeds stored for 15 days was 10.9%, which was 79.8% lower than unstored seeds. The viability of seeds was also significantly influenced by soil water content. The germination rate under the 0 g g−1 soil water content treatment was 105.3% higher than 0.10 g g−1 soil water content. Groundwater level significantly affected seed germination and seedling growth. The suitable groundwater level for seed germination and seedling growth was between −10 and −15 cm, at which, the germination rate, seedling survival rate and seedling biomass reached their highest values. Compared to the 0 and −20 cm groundwater levels, the −10 cm level resulted in a 16.8% and 166.7% higher germination rate, 14.1% and 9.2% higher seedling survival rate and 116.7% and 82.0% higher aboveground biomass, respectively. The longest main roots were observed at the −15 cm groundwater level. Therefore, it was concluded that changes in soil water content and groundwater level affect the regeneration of remnant M. laxiflora populations.
中文翻译：
土壤水分条件对洋紫杨残存群体幼苗再生的影响
由于再生困难，洋紫苏残留的种群正在退化。为了揭示阻碍拉美分支杆菌种群再生的关键因素，本研究研究了在不同土壤含水量和地下水位下种子的持久性，种子发芽以及幼苗的存活和生长。结果显示，随着储存时间的延长，种子活力显着降低。贮藏15天的种子发芽率为10.9％，比未贮藏的种子低79.8％。种子的生存力还受到土壤含水量的显着影响。0 g g -1土壤水分处理下的发芽率比0.10 g g -1高105.3％土壤含水量。地下水位显着影响种子发芽和幼苗生长。种子萌发和幼苗生长的适宜地下水位在-10至-15 cm之间，此时发芽率，幼苗成活率和幼苗生物量达到最高值。与0和20 cm地下水位相比，-10 cm水位的发芽率分别提高16.8％和166.7％，幼苗成活率分别提高14.1％和9.2％，地上生物量分别提高116.7％和82.0％。在-15 cm地下水位观察到最长的主根。因此，可以得出结论，土壤含水量和地下水位的变化会影响剩余的M. laxiflora种群的再生。
更新日期：2020-02-26
中文翻译：
土壤水分条件对洋紫杨残存群体幼苗再生的影响
由于再生困难，洋紫苏残留的种群正在退化。为了揭示阻碍拉美分支杆菌种群再生的关键因素，本研究研究了在不同土壤含水量和地下水位下种子的持久性，种子发芽以及幼苗的存活和生长。结果显示，随着储存时间的延长，种子活力显着降低。贮藏15天的种子发芽率为10.9％，比未贮藏的种子低79.8％。种子的生存力还受到土壤含水量的显着影响。0 g g -1土壤水分处理下的发芽率比0.10 g g -1高105.3％土壤含水量。地下水位显着影响种子发芽和幼苗生长。种子萌发和幼苗生长的适宜地下水位在-10至-15 cm之间，此时发芽率，幼苗成活率和幼苗生物量达到最高值。与0和20 cm地下水位相比，-10 cm水位的发芽率分别提高16.8％和166.7％，幼苗成活率分别提高14.1％和9.2％，地上生物量分别提高116.7％和82.0％。在-15 cm地下水位观察到最长的主根。因此，可以得出结论，土壤含水量和地下水位的变化会影响剩余的M. laxiflora种群的再生。
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