摘要
Coastal zones comprising important intertidal tropical and subtropical ecosystems are characterized by high productivity, diversity and unique zonation of various plant and animal communities. The comparison of some selected physicochemical soil properties viz. texture, particle density, moisture content, pH, organic carbon and total nitrogen between planted site （Telir char） and barren site （Boyar char） has been investigated at surface （0-10 cm） and subsurface （10-45 cm） soil across three different land strips viz. inland, middle part and sea side in Lakshmipur coast of Bangladesh. Sand particles in the soil were lower in planted site than barren site. The reverse trend was found in case of both silt and clay percentage. Coastal afforestation had a significant effect on soil binding process since a common trend of increment in soil particle density was noticed. Maximum increment （20.43% to 23.30%） in soil moisture content was recorded in surface soil across the seaside while at subsurface soil both across the middle part （19.53% to 22.30%） and sea side （20.19% to 22.96%）. Moreover, the highest reduction in soil pH was recorded at surface soil （7.27 to 6.60） across the sea side and subsurface soil （7.16 to 6.67） in inland due to the influence of coastal plantation. Across all the land strips and the soil depths studied, soil organic carbon was higher in planted site than in barren site with only exception at subsurface soil in the middle part （0.50% in both sites）. Total soil nitrogen in the study area was increased at both depths due to forestation with the highest increment in the inland at both surface and subsurface soil.
沿海地区包含重要的潮间带的热带与亚热带的生态系统,具有高产,丰富的动植物多样性和动植物群落独特的带状配列的特点。在孟加拉罗基布尔沿海,选则三个不同地形带(条状陆地,中部和海岸边),并在不同土壤深度(0-10cm和10-45cm)的有植被和裸地中,调查了土壤物化特性包括土壤质地、土壤颗粒度、水分含量、pH值、有机碳和全氮含量。植被地的土壤沙粒比裸地的含量低。在淤泥地和黏土地有相反的结果。海岸造林对土壤粘合物有明显的影响,结果发现土壤颗粒度有增加的趋势。调查了土壤表面,地表下的土壤和沿海土壤的最大土壤含水量分别为20.43%to23.30%,19.53%to22.30%和20.19%to22.96%。而且,由于沿海植被的影响,土壤表面的土壤pH值减少(7.27-6.60),地表下的土壤和沿海的pH值从7.16减少到6.67。在试验地,有植被地的土壤有机碳都高于裸地。由于沿海造林,土壤全氮增加,在陆地土壤表面和地表下的土壤全氮值最高。3表6参36。
