螺类牧食与沉积物类型对苦草生长的影响  

Effects of snail herbivory and sediment type on the growth of Vallisneria spiralis

作　　者：李宽意[1] 刘正文[1] 杨宏伟[2] 宋晓兰[1] 文明章[3] 

机构地区：[1]中国科学院南京地理与湖泊研究所 [2]南京大学,南京210081 [3]南京信息工程大学,南京210044

出　　处：《生态学报》2007年第11期4907-4912,共6页Acta Ecologica Sinica

基　　金：国家"863"计划资助项目(2006AA06Z337);中国科学院知识创新工程资助项目(KZCX2-YW-419);国家"973"计划资助项目(2002CB412307)~~

摘　　要：在室外实验条件下,研究了螺类牧食与沉积物类型对苦草生长的影响。结果表明:椭圆萝卜螺的牧食对苦草生长有显著影响,牧食损害使苦草的相对生长率明显降低、块茎数量及重量下降。沉积物类型对苦草生长也有明显影响,苦草的相对生长率在营养盐相对丰富的湖泥处理组中要远高于岸泥处理组,而根须数与块茎重量在湖泥处理组中显著低于岸泥处理组。螺类牧食与沉积物类型对苦草的各项生长指标无明显交互作用。An outdoor experiment was conducted to investigate effects of the herbivory of snail Radix swinhoei and sediment type on the growth of submerged macrophyte Vallisneria spiralis from June to August in 2006. Results showed that snail herbivory on plant tissue suppressed V. spiralis growth. Furthermore, herbivory damage resulted in a decrease in tuber number and weight. Plant growth was affected by sediment type. The relative growth rate of V. spiralis was much higher in fertile lake sediment treatment than that in infertile soil treatment. Besides, root number and tuber weight were significantly lower in lake sediment treatment than that in soil treatment. However, the interactive effects of both snail herbivory and sediment type on the growth of V. spiralis were not significant.

关 键 词：螺类牧食 沉积物类型 苦草 生长 

分 类 号：Q948[生物学—植物学]