【摘要】 [目的]理清有机碳和植被生物量与土壤理化因子之间的关系，科学调控土壤碳库。[方法]以陕西榆林市红柳林煤矿区不同植被类型(草本、灌木、草灌)为对象，研究黄绵土0～<200 cm土层的有机碳分布特征、碳密度以及土壤养分差异，探讨土壤有机碳、植被生物量、土壤理化性质之间的相互关系。[结果]0～<200 cm土层的土壤有机碳含量和碳密度表现为草灌植被最高，灌木植被次之，草本植被最低。土壤有机碳含量均随土层的加深而降低，100～<200 cm较0～<100 cm土层的降幅分别为灌木(35.68%)>草本(25.06%)>草灌(19.83%)。土壤有机碳含量与每种植被类型的生物量(每年凋落物的量)密切相关，它们又与土壤性质如土壤全氮、全磷、有效磷、铵态氮、碳酸钙呈显著正相关(P<0.05,P<0.01),与土壤pH呈显著负相关。[结论]总体看来，土壤养分与有机碳含量之间存在着紧密的联系，二者相互作用、相互影响，草灌植被相比其他植被类型更加有利于土壤有机碳增加及其稳定性的提高。更多还原

【Abstract】 [Objective] Clarify the relationship between organic carbon and vegetation biomass and soil physical and chemical factors, and to scientifically regulate the soil carbon pool. [Method] Taking different vegetation types(herb, shrub, herb-shrub) in the Hongliulin coal mining area of Yulin City, Shaanxi Province as the object, the distribution of organic carbon, carbon density, and soil nutrient differences in the 0-<200 cm loess soil layer was studied, and the relationship among organic carbon, vegetation biomass, and soil physicochemical factors was explored. [Result] The results showed that the soil organic carbon content and carbon density in the 0-<200 cm soil layer were highest in herb-shrub vegetation, followed by shrub vegetation, and lowest in herb vegetation. The organic carbon content in the soil significantly decreased with the deepening of the soil layer. The decrease in the 100-<200 cm soil layer compared to the 0-<100 cm soil layer was as follows: shrub(35.68%) > herb(25.06%)> herb-shrub(19.83%). The soil organic carbon content was closely related to the biomass of each vegetation type, especially to the annual amount of litter, and which were significantly positively correlated with soil properties such as total nitrogen, total phosphorus, available phosphorus, ammonium nitrogen, and calcium carbonate(P<0.05, P<0.01), and significantly correlated with soil pH negatively. [Conclusion] Overall, it seems that there is a strong link between soil nutrients and organic carbon content, and the two interact and influence each other, with grass-irrigation vegetation being more conducive to the increase of soil organic carbon and its stability than other vegetation types.更多还原