沙地土壤C∶N∶P比对早期植物群落物种多样性的影响

为揭示土壤碳∶氮∶磷(C∶N∶P)比对植物群落物种多样性的影响,以宁夏哈巴湖国家级自然保护区内沙地植物群落(沙柳群落和油蒿群落)为研究对象,调查计算了沙地植物群落的物种多样性,测定了群落中土壤C、N、P含量,分析讨论了土壤C∶N∶P比与沙地植物群落物种多样性之间的关系。结果表明,分布于流动、半固定沙地的沙柳群落其土壤C∶N∶P比对物种多样性的影响不显著,而分布于半固定、固定沙地的油蒿群落其土壤C∶N∶P比对物种多样性的影响显著。这说明沙地植物群落生物量不断增大的同时,枯枝落叶增多,土壤C、N、P显著增多,较大的土壤C∶N比与N∶P比与不断增大的物种多样性有趋同变化,因此,土壤的C∶N∶P比能够影响沙地植物群落的物种多样性。

Effects of Soil C: N: P Ratio on Species Diversity of Preliminary Plant Communities on Sandy Land

To elucidate influences of soil carbon : nitrogen : phosphorus (C:N:P) on species diversity of a plant community, investigations were conducted of species diversities of amathophyta communities (Salix psammophila community and Artemisia ordosica community) on sand land of the Ningxia Habahu National Nature Reserve, contents of soil C, N and P in the area measured, and relationship between soil C:N:P ratio and species diversity analyzed and discussed. Results show that soil C:N:P ratio had almost nothing to do with species diversity of the S. psammophila communities on mobile or semi-fixed sand lands, but did have some significant influences on the A. ordosica communities on semi-fixed sand land or fixed sand land, which suggests that with the plant community increasing in biomass, more litter was yielded, thus significantly increasing the contents of soil C, N and P; and the higher the soil C:N ratio and N:P ratio, the higher the species diversity of the community, exhibiting a similar variation trend. Therefore, soil C:N:P ratio is proven to be able to affect species diversity of the plant communities on sand land.