黄土丘陵区不同种植类型梯田2m土层有机碳的分布特征

发布时间：2018-09-18 10:48

【摘要】：为了明确黄土丘陵区梯田种植类型对0—200cm有机碳垂直分布的影响,以甘肃庄浪县堡子沟流域玉米、小麦、土豆、苹果和间作(苹果+土豆)5种典型种植类型梯田的土壤为研究对象,分析土壤有机碳含量、储量在0—200cm的垂直分布特征及影响因素,探讨种植类型对0—200cm土层有机碳分布稳定性的影响。结果表明:(1)5种种植类型梯田的0—200cm土层中,有机碳含量平均为3.33~4.86g/kg,储量平均为8.0~11.69t/hm~2;含量和储量均在间作和苹果地显著高于玉米地、小麦地(P0.05);各样地有机碳含量均表现出明显的层次性,0—20cm显著高于其他各层(P0.05),20cm以下的各层中的变异较小,有机碳储量的垂直分布特征与含量相同,且层次间差异更为显著。(2)土壤有机碳分配比例在0—20cm为17.57%,20—100cm为41.21%,100—200cm为41.22%,种植类型对0—200cm土层有机碳分布稳定性影响较小。有机碳分层比例SR(0—20cm/20—40cm)为1.51~1.78,SR(0—20cm/40—60cm)为1.78~2.02,表明土壤正向发育熟化,土壤质量明显提高。(3)水分能够影响有机碳垂直分布,种植类型对土壤有机碳的深层分布和固存有一定影响,苹果园的发展有利于梯田土壤有机碳的提高。
[Abstract]:In order to understand the effect of terrace planting type on vertical distribution of 0-200cm organic carbon in loess hilly area, corn, wheat and potato were used in the valley of Baozigou, Zhuanglang County, Gansu Province, China. The soil of five typical planting types of apple and intercropping (apple potato) was studied. The content of soil organic carbon, the vertical distribution of soil storage in 0-200cm and the influencing factors were analyzed. The effects of planting types on the distribution stability of organic carbon in 0-200cm soil layer were studied. The results showed that: (1) in the 0-200cm soil layer of five types of terraces, the average organic carbon content was 3.33 ~ 4.86 g / kg, the average storage was 8.0 ~ 11.69 t / hm ~ (-2), and the content and storage of organic carbon in the intercropping and apple fields were significantly higher than that in the corn field. In wheat field (P0.05), the organic carbon content in all plots was significantly higher than that in the other layers (P 0.05), and the vertical distribution of organic carbon storage was the same as that of the other layers (P 0.05), and the content of organic carbon was the same as that of the other layers (P 0.05), and the distribution of organic carbon was similar to that of the other layers (P 0.05). The soil organic carbon distribution ratio in 0-20cm was 17.5720 ~ 100cm and 41.21 ~ 200cm was 41.22cm, and the planting type had little effect on the stability of soil organic carbon distribution in 0-200cm soil layer. The organic carbon stratification ratio (SR (0-20cm/20-40cm) was 1.51 ~ 1.78 ~ (8) SR (0-20cm/40-60cm) = 1.782.02, which indicated that the soil was developed and matured, and the soil quality was improved obviously. (3) moisture could affect the vertical distribution of organic carbon. Planting type had some influence on the deep distribution and sequestration of soil organic carbon, and the development of apple orchard was beneficial to the improvement of soil organic carbon in terrace.
【作者单位】：西北农林科技大学资源环境学院农业部西北植物营养与农业环境重点实验室;
【基金】：水利部公益性行业专项(201501045)
【分类号】：S153.6

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