氮添加对内蒙古退化草地植物群落多样性和生物量的影响

杨倩,王娓,曾辉

Effects of nitrogen addition on the plant diversity and biomass of degraded grasslands of Nei Mongol, China

Qian YANG,Wei WANG,Hui ZENG

表1 实验样地的土壤和植被基本属性

Table 1 Plant and soil characteristics at the experimental sites

名称 Term 极度退化草地 EDG 重度退化草地 SDG 中度退化草地 MDG 物种组成 Species composition 羊草、黄囊薹草、马唐、狗尾草、沙蓬藜等 Leymus chinensis; Carex korshinskyi; Digitaria sanguinalis; Setaria viridis; Agriophyllum squarrosum; Chenopodium acuminatum et al. 拂子茅、贝加尔针茅、硬质早熟禾、黄囊薹草、腺毛委陵菜、星毛委陵菜、冷蒿、紫羊茅、冰草、狼毒、糙隐子草、阿尔泰狗娃花等 Calamagrostis epigeios; Stipa baicalensis; Poa sphondylodes; Carex korshinskyi; Potentilla longifolia; Potentilla acaulis; Artemisia frigida; Festuca rubra; Agropyron cristatum; Stellera chamaejasme; Cleistogenes squarrosa; Heteropappus altaicus et al. 拂子茅、贝加尔针茅、羊草、硬质早熟禾、腺毛委陵菜、黄囊薹草、冷蒿、紫羊茅、冰草、糙隐子草、阴山胡枝子、阿尔泰狗娃花等 Calamagrostis epigeios; Stipa baicalensis; Leymus chinensis; Poa sphondylodes; Potentilla longifolia; Carex korshinskyi; Artemisia frigida; Festuca rubra; Agropyron cristatum; Cleistogenes squarrosa; Lespedeza inschanica; Heteropappus altaicus et al. 顶极种相对盖度 Relative coverage of climax species (%) 34.48 39.53 54.05 退化指示种相对盖度 Relative coverage of degradation indicators (%) 34.48 32.56 29.73 一年生植物相对盖度 Relative coverage of annuals (%) 31.04 27.91 16.22 土壤全碳 Soil total carbon (%) 0.83 1.67 2.06 土壤全氮 Soil total nitrogen (%) 0.06 0.14 0.17 砂粒含量 Sand content (%) 66.10 57.30 58.40 草地退化指数 Grassland degradation index 0.379 0.543 0.642