开垦年限对松嫩碱化草地土壤碳库的影响

发布时间：2018-07-29 11:09

【摘要】：采用等质量计算土壤碳储量的方法,研究了不同开垦年限对碱化草地0~100 cm土层土壤有机碳、无机碳和总碳储量的影响。结果表明:开垦24年后,耕地与天然草地相比0~100 cm土层土壤平均有机碳含量下降了11.22%,无机碳含量上升了27.47%;草地开垦以后,0~100 cm土层土壤有机碳储量以0.88 Mg hm~(-2)a~(-1)的速率下降,土壤无机碳储量以8.18 Mg hm~(-2)a~(-1)的速率增加;无机碳储量的增加弥补了有机碳储量的下降,从而使得0~100 cm土层土壤总碳储量以7.30 Mg hm~(-2)a~(-1)的速率增加。与等体积法得到的结果相比,应用等质量法估算得到的结果提高了土壤的碳库储量,使得0~100 cm土层土壤有机碳储量的损失速率降低了2.75 Mg hm~(-2)a~(-1),而土壤无机碳储量的截获速率则提高了7.65 Mg hm~(-2)a~(-1)。以上结果表明,在估算富含无机碳的土壤碳库时应将土壤无机碳库考虑在内,而且在土地利用方式改变后,将土壤容重考虑在内的等质量法估算土壤碳库储量可能比等体积法更合适。
[Abstract]:The effects of different reclamation years on soil organic carbon, inorganic carbon and total carbon storage in 0 ~ 100 cm soil layer of alkaline grassland were studied by using the method of equal quality calculation of soil carbon storage. The results showed that after 24 years of reclamation, the average soil organic carbon content in 0 ~ 100 cm soil layer decreased by 11.22 2, inorganic carbon content increased 27.47%, and the soil organic carbon storage decreased by 0.88 mg hm ~ (-2) a ~ (-1) after grassland reclamation. Soil inorganic carbon storage increased at the rate of 8.18 mg hm ~ (-2) a ~ (-1), and the increase of inorganic carbon storage made up for the decrease of organic carbon storage, thus increasing the rate of 7.30 mg hm ~ (-2) a ~ (-1) in 0 ~ 100 cm soil layer. Compared with the results obtained by the equal volume method, the results obtained by using the equal mass method can improve the carbon pool reserves of the soil. The loss rate of soil organic carbon in 0 ~ 100 cm soil layer decreased by 2.75 mg hm ~ (-2) a ~ (-1), while the interception rate of inorganic carbon storage increased by 7.65 mg hm ~ (-2) a ~ (-1). These results suggest that inorganic carbon pools should be taken into account in estimating inorganic carbon-rich soil carbon pools, and that when land use patterns change, The equal-mass method, which takes soil bulk density into account, may be more suitable than equal volume method for estimating soil carbon pool reserves.
【作者单位】：新疆农业大学草业与环境科学学院;中国科学院东北地理与农业生态研究所;
【基金】：国家自然科学基金项目(31500446)资助
【分类号】：S812.2

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