贵州喀斯特地区草本植被盖度与土壤养分的相互关系  

The relationship between coverage of herbaceous vegetation communities and soil nutrients in the Karst area of Guizhou province

作　　者：高晟[1] 王磊[1] 薛建辉[1] 吴永波[1] 戎宇[1] 

机构地区：[1]南京林业大学,江苏省林业生态工程重点实验室,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2012年第1期79-83,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：“十一五”国家科技支撑计划(2006BAD03A0303)

摘　　要：采用极点排序法对贵州普定县喀斯特地区的草本群落进行了研究,分析了草本植物盖度和土壤养分的相关性。结果表明:该地区土壤速效钾含量是限制草本群落分布的主要因素;盖度与土壤的全钾含量、水解氮含量、有效磷含量呈显著正相关,与土壤速效钾含量呈极显著正相关,相关性系数达0.96。盖度随速效钾含量的增加先迅速增加,当土壤速效钾含量达148.34 mg/kg时,增速急剧降低,最后渐近平缓。因此,在喀斯特地区对草本群落的分布和恢复起到最主要作用的因子是土壤速效钾含量。By using the method of Polar Ordination, herb community in the Karst area was ordered. The correlation between the coverage of herb vegetation and soil nutrient index was analyzed. The results indicated that the available potassium in the soil was the main factor that limited the distribution of herb community in this area. The coverage was direct correlated to the total potassium, hydrolysable nitrogen and available phosphonium in the soil, also significantly direct correlated to the available potassium in the soil with the coefficient of correlation 0.96. The coverage increased rapidly with the increasing of the available potassium, however, when the amount of available potassium in the soil reached 148.34 mg/kg, the growth rate decreased sharply and f/nally asymptotically flatted.

关 键 词：草本群落 盖度 土壤养分 排序 喀斯特地区 

分 类 号：S718[农业科学—林学]