摘要
关于大气ＣＯ２浓度倍增（即为７００μｍｏｌＣＯ２·ｍｏｌ－１空气）将对植物生长产生诸多影响，已有大量报道［１，２］。但ＣＯ２倍增对植物及所在土壤中微生物影响的研究甚少［３，４］。土壤微生物是陆地生态系统中最活跃的成分，担负着分解动植物残体的重要作用，...
Salix babylonica L.Triticum aestivum L.Chenopodium album L. and Amaranthus cruentus L.were grown in the N deficient soil in open top chambers blown with ambient or doubled ambient CO 2 air, and their growth was measured.Soil samples were collected to assess the influence of doubled CO 2 on the soil microbial biomass C (C mic ) and N (N mic ). Results showed that the biomass of shoot and root was increased by doubled CO 2 in the four species of plants. Doubled CO 2 increased C mic in S.babylonica and decreased C mic in T.aestivum and C.album. On the other hand, N mic in three species except T.aestivum was stimulated by doubled CO 2. Doubled CO 2 had no significant effect on C mic in A.cruentus and N mic in T.aestivum. However, the ratios of C mic to N mic of all four species were consistently declined under doubled CO 2 treatment. lt implies that CO 2 enrichment may have positive influence on the quality of organic matter of N low soil in global change.
基金
国家自然科学基金
关键词
CO2倍增
植物生长
土壤微生物
土壤有机质
Doubled CO 2, Plant growth, Soil microbial biomass, Soil organic matter
