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对宁夏干旱区的沙枣-芨芨草群落进行调查,分析土壤有机碳含量与地下生物量、土壤水分等因子的关系,以及土壤有机碳的积累机制.结果表明:在沙枣-芨芨草群落中,随着土层深度的增加,土壤有机碳含量逐渐减少,且在水平和垂直方向上的变化格局较为平缓.不同区位土壤有机碳含量与其影响因子的相关性具有明显差异.0~30 cm层中,土壤有机碳含量与土壤含水量呈显著负相关;60~150 cm层中,土壤有机碳含量与根系生物量及土壤含水率呈显著正相关.经偏回归分析,0~30 cm层土壤中芨芨草根系生物量密度对土壤有机碳含量具有显著贡献;60~150 cm层中土壤有机碳格局主要受沙枣根系和土壤含水率的影响;而30~60 cm层土壤有机碳含量与根系生物量密度和土壤含水率的关系不显著.在沙枣-芨芨草群落内,不同层次、不同区位的土壤有机碳积累机制具有明显的差异.
Achnatherum splendens community in Ningxia arid region was investigated to analyze the relationship between soil organic carbon content and the underground biomass, soil moisture and other factors, as well as the accumulation mechanism of soil organic carbon.The results show that: With the increase of soil depth, the content of soil organic carbon decreased gradually, and the horizontal and vertical change pattern was relatively flat.The correlation between soil organic carbon content and its influencing factors in different locations was significantly different.While in 0 ~ 30 cm layer, There was a significant negative correlation between soil organic carbon content and soil water content. There was a significant positive correlation between soil organic carbon content and root biomass and soil water content in 60-150 cm layer. By partial regression analysis, The root biomass density had a significant contribution to the soil organic carbon content. The soil organic carbon pattern in the 60-150 cm layer was mainly affected by the root system and soil water content in the jujube and the soil organic carbon content in the 30-60 cm layer was positively correlated with the root biomass density And the soil moisture content was not significant.Under different stages and different locations, there were significant differences in the mechanism of soil organic carbon accumulation in the sandwort (Solanum lyratum -Cv.