北戴河滨海地区涝峪苔草生态适应性研究OA

To investigate the causes of the ecological adaptability decline of Carex giraldiana Kük.in the coastal area of Beidaihe,this study collected 16 groups of rhizosphere soil samples(0-10 cm)from plants under full sunlight and 70%shade conditions,as well as from vigorously growing and declining plants,in a planting site 1 km from the coast in September 2025.Soil pH and major nutrient contents were measured.The results showed that the soil in the study area was generally alkaline(mean pH 8.13).Soil pH＞8.2 was identified as the critical threshold leading to poor growth of Carex giraldiana,showing a highly significant negative correlation with plant vigor.The contents of soil organic matter,alkali-hydrolyzable nitrogen,available phosphorus,and available potassium in vigorously growing plots were significantly higher than those in declining plots.Correlation analysis revealed a core mechanism:soil alkalization(high pH)first leads to a decrease in organic matter,which subsequently causes a reduction in alkali-hydrolyzable nitrogen and phosphorus fixation(resulting in available phosphorus deficiency),ultimately hindering plant growth.Among these factors,available phosphorus plays a key compensatory role under high pH conditions.This study confirms that the key to maintaining Carex giraldiana in the coastal area of Beidaihe lies in interrupting the nutrient barrier caused by soil alkalization-by measures such as increasing organic fertilizer application-to achieve the integrated goals of reducing pH,improving soil fertility,and ensuring healthy plant growth.