【摘要】 探明鄱阳湖沙化区植被恢复后植物、凋落物与土壤碳（C）、氮（N）、磷（P）化学计量特征,对我国亚热带地区沙化土地的生态恢复与重建具有重要意义。在江西省都昌县典型沙化区建立110 hm2沙化土地恢复试验区,采集狗牙根（Cynodon dactylon）、香根草（Vetiveria zizanioides）、单叶蔓荆（Vitex rotundifolia）、算盘子（Glochidion puberum）、湿地松（Pinus elliottii） 5种优势植物的新鲜叶片、凋落物及林下表层0～10 cm土壤样品,测定有机C、全N、全P含量。结果表明:（1） 5种植物叶片C、N、P含量平均为394.3、11.9、1.2 mg·g^-1;凋落物C、N、P含量平均为366.7、6.8、0.9 mg·g^-1;表层土壤C、N、P含量平均为6.8、0.4、0.5mg·g^-1;叶片养分含量显著高于凋落物和土壤。（2）叶片与土壤C、P含量和C∶P显著相关（P<0.05）;凋落物C、N、P含量与叶片C、N、P含量及化学计量比呈极显著相关（P <0.01）,与土壤C、N、P含量及C∶P显著相关（P<0.05）。（3）鄱阳湖沙地植物C、N、P含量低于全国平均水平。轻度沙化区14<N∶P<16,中度、重度沙化区N∶P<14,根据营养限制定理,该地区植物生长受N、P共同作用的同时更多受N限制。更多还原

【Abstract】 Clarifying the C ∶ N ∶ P stoichiometry of plant-litter-soil continuum after vegetation restoration in desertification area of Poyang Lake has great significance for ecological restoration and reconstruction of desertification land in subtropical regions of China. We established a restored ecosystem with an area of 110 hm2 in a typical desertification area of Duchang,Jiangxi Province. We collected 0-10 cm soil samples,fresh leaves,and litters of five dominant species,including Cynodon dactylon,Vetiveria zizanioides,Vitex rotundifolia,Glochidion wilsonii,and Pinus elliottii. We measured C,N,and P concentrations in all samples. The results showed that:（ 1） The average concentrations of C,N,P in leaves of five species were 394.3,11.9 and 1.2mg·g^-1,366.7,6.8 and 0.9 mg·g^-1in litters and 6.8,0.4 and 0.5 mg·g^-1in soils. The concentrations of elements in leaves were significantly higher than those in litters and soils.（ 2） Significant correlations of C and P concentrations and C ∶ P were found between leaf and soil（ P<0.05）. C,N,P concentrations in litters were significantly correlated with C,N,P concentrations and stoichiometric ratios in leaves（ P < 0. 01）,and significantly correlated with C,N,P concentrations and C ∶ P in soils（ P < 0.05）.（ 3） C,N,P concentrations of plants in Poyang Lake desertification land were lower than national mean values of China. Leaf N ∶ P was 14-16 in mild desertification area,and < 14 in moderate and heavy desertification area. According to nutrient limitation theory,plant growth in this area was co-limited by N and P,and with relatively much stronger limitation of N.更多还原