酸雨对马尾松林下苔藓植物的影响

Influence of Acid Rain on Diversity and Structure of Bryophytes under the Pinus Massoniana Wood

苔藓植物对酸沉降的反应较为敏感.本文通过采用野外调查和室内模拟试验分析相结合的方法,对重庆缙云山马尾松林下所选的24个样方中代表苔藓植物的种类,盖度,频度,生长状况,结构特征、光合色素含量及多样性指数进行了综合研究与分析.结果表明酸沉降会明显降低苔藓植物的物种多样性,使其结构更加简单,表现为经模拟酸沉降试验后,所选苔藓植物的平均厚度均呈下降趋势,形态及长势的恶化程度,苔藓植物体内光合色素总量也随喷洒酸雨pH值的下降而越趋严重.在所选苔藓植物中,对叶藓的酸雨敏感度级别最大.

Bryophyte is sensitive to acid sedimentation. The text by means of field investigations and inside simulative laboratory analysis, a comprehensive study on species number, coverage, frequency, growth condition, diversity index, photosynthetic pigment and structure characteristic of representative bryophtes which came from 24 pieces of sampling which selected from Chongqing Jinyun Mountain pinus massoniana wood. Result indicates that acid sedimentation will obviously reduce species diversity of bryophtes and make its structure more simple. The performance is that after experiment of simulative acid sedimentation its average thickness and bryophyte total photosynthetic pigment showed a drop trend and worsening degree of growing trend and shape was also more serious while pH value of sprayed acid rain dropped. Level of sensitive degree to acid rain of Distichum capillaceum is the biggest.