六道沟小流域地形序列土壤碳剖面分布特征及影响因素
发布时间：2019-03-14 17:18
【摘要】：为了更好地理解黄土高原植被恢复与生态重建过程对土壤碳循环过程的影响,研究选取位于黄土高原六道沟小流域的典型土壤地形序列(东北坡NE序列,西坡W序列),分析了不同坡向间及同一坡向内随植被类型变化土壤有机碳和无机碳的剖面分布特征及其影响因素。结果表明:六道沟小流域地形序列土壤有机碳含量在0—50cm土层内随土层深度增加而显著降低,50cm土层以下基本趋于稳定,且剖面上层(0—50cm)有机碳含量显著高于剖面下层(50—200cm,p0.05),但在同一深度土层(0—50,50—200,0—200cm)不同坡向林地和草地土壤有机碳平均含量均没有显著差异(p0.05)。与有机碳相比,无机碳含量相对较高并且主要在剖面下部(50cm以下)不同深度土层富集。NE序列林地和草地剖面无机碳平均含量接近(p0.05),而W序列林地剖面无机碳平均含量显著高于草地(p0.05);不同坡向草地剖面无机碳平均含量无显著差异(p0.05),但不同坡向林地剖面无机碳平均含量表现为W序列显著高于NE序列(p0.05)。0—50cm土层有机碳含量与pH、容重和土壤含水量均呈极显著负相关关系,而与土壤总孔隙度呈极显著正相关关系;50—150cm土层无机碳含量与pH和土壤总孔隙度均呈极显著负相关关系,而与容重、黏粒含量和土壤含水量均呈极显著正相关关系。NE序列和W序列2 m土体总碳密度相当,分别为15.2~47.4kg/m~2和18.3~51.3kg/m~2,其中无机碳密度占78%~94%,1—2m土层总碳密度占2m土体总碳密度的35%~74%。若只考虑土壤有机碳库或只考虑浅层1m土壤碳库,六道沟小流域2m土体总碳储量平均将被低估88%和51%。
[Abstract]:In order to better understand the effects of vegetation restoration and ecological reconstruction on soil carbon cycle in the Loess Plateau, the typical soil topography series (NE sequence on northeast slope and W sequence on west slope) located in Liudaogou watershed of Loess Plateau were selected. The distribution characteristics of soil organic carbon and inorganic carbon along with vegetation types and the influencing factors of soil organic carbon and inorganic carbon in different slope directions and in the same slope direction were analyzed. The results showed that the content of soil organic carbon decreased significantly with the increase of soil depth in the 0-50cm soil layer, and the soil organic carbon content in the terrain sequence of Liudaogou small watershed decreased significantly with the increase of the depth of the soil layer. The organic carbon content in the upper layer of the profile (0-50cm) was significantly higher than that in the lower layer of the profile (50 脳 200 cm, p0.05). However, there was no significant difference in soil organic carbon content between forestland and grassland in the same depth soil layer (0 ~ 50, 50 ~ 200, 0 ~ 200 cm) (p0.05). Compared with organic carbon, the inorganic carbon content was relatively higher and enriched mainly in different depths of the lower part of the profile (below 50cm). The average content of inorganic carbon in the NE sequence woodland and grassland section was close to that in the grassland section (p0.05). The average content of inorganic carbon in W sequence woodland profile was significantly higher than that in grassland (p0.05). There was no significant difference in the average content of inorganic carbon in different slope grassland profile (p0.05), but the average content of inorganic carbon in woodland profile with different slope direction was significantly higher than that in NE sequence (p0.05). The organic carbon content in 0-50cm soil layer and pH, were significantly higher than those in different slope-orientation woodland profile (p0.05). There was a very significant negative correlation between bulk density and soil water content, but a very significant positive correlation between bulk density and soil total porosity. The inorganic carbon content in 50-150cm soil layer was negatively correlated with pH and soil total porosity, but positively correlated with bulk density, clay content and soil water content. The soil total carbon density of NE sequence and W series was similar to that of 2 m soil mass in NE series and W series, and there was a significant positive correlation between inorganic carbon content and soil bulk density, clay content and soil moisture content. The density of inorganic carbon is 78% ~ 94%, and the total carbon density of 1 ~ 2m soil layer is 35% ~ 74% of the total carbon density of 2m soil. The results are as follows: 15.2~47.4kg/m~2 and 18.3 ~ 51.3 kg 路kg ~ (- 1) 路m ~ (- 1) 路m ~ (- 1) respectively. If only soil organic carbon pool or shallow 1m soil carbon pool is considered, the average total carbon storage of 2m soil in Liudaogou small watershed will be underestimated by 88% and 51% on average.
【作者单位】： 西北农林科技大学资源环境学院;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院地理科学与资源研究所中国科学院生态系统网络观测与模拟重点实验室;中国科学院大学资源与环境学院;
【基金】：国家自然科学基金青年基金项目(41601221) 国家重点研发计划重点专项(2016YFC0501605) 中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(A314021402-1602)
【分类号】：S153.6
本文编号：2440190
[Abstract]:In order to better understand the effects of vegetation restoration and ecological reconstruction on soil carbon cycle in the Loess Plateau, the typical soil topography series (NE sequence on northeast slope and W sequence on west slope) located in Liudaogou watershed of Loess Plateau were selected. The distribution characteristics of soil organic carbon and inorganic carbon along with vegetation types and the influencing factors of soil organic carbon and inorganic carbon in different slope directions and in the same slope direction were analyzed. The results showed that the content of soil organic carbon decreased significantly with the increase of soil depth in the 0-50cm soil layer, and the soil organic carbon content in the terrain sequence of Liudaogou small watershed decreased significantly with the increase of the depth of the soil layer. The organic carbon content in the upper layer of the profile (0-50cm) was significantly higher than that in the lower layer of the profile (50 脳 200 cm, p0.05). However, there was no significant difference in soil organic carbon content between forestland and grassland in the same depth soil layer (0 ~ 50, 50 ~ 200, 0 ~ 200 cm) (p0.05). Compared with organic carbon, the inorganic carbon content was relatively higher and enriched mainly in different depths of the lower part of the profile (below 50cm). The average content of inorganic carbon in the NE sequence woodland and grassland section was close to that in the grassland section (p0.05). The average content of inorganic carbon in W sequence woodland profile was significantly higher than that in grassland (p0.05). There was no significant difference in the average content of inorganic carbon in different slope grassland profile (p0.05), but the average content of inorganic carbon in woodland profile with different slope direction was significantly higher than that in NE sequence (p0.05). The organic carbon content in 0-50cm soil layer and pH, were significantly higher than those in different slope-orientation woodland profile (p0.05). There was a very significant negative correlation between bulk density and soil water content, but a very significant positive correlation between bulk density and soil total porosity. The inorganic carbon content in 50-150cm soil layer was negatively correlated with pH and soil total porosity, but positively correlated with bulk density, clay content and soil water content. The soil total carbon density of NE sequence and W series was similar to that of 2 m soil mass in NE series and W series, and there was a significant positive correlation between inorganic carbon content and soil bulk density, clay content and soil moisture content. The density of inorganic carbon is 78% ~ 94%, and the total carbon density of 1 ~ 2m soil layer is 35% ~ 74% of the total carbon density of 2m soil. The results are as follows: 15.2~47.4kg/m~2 and 18.3 ~ 51.3 kg 路kg ~ (- 1) 路m ~ (- 1) 路m ~ (- 1) respectively. If only soil organic carbon pool or shallow 1m soil carbon pool is considered, the average total carbon storage of 2m soil in Liudaogou small watershed will be underestimated by 88% and 51% on average.
【作者单位】： 西北农林科技大学资源环境学院;中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院地理科学与资源研究所中国科学院生态系统网络观测与模拟重点实验室;中国科学院大学资源与环境学院;
【基金】：国家自然科学基金青年基金项目(41601221) 国家重点研发计划重点专项(2016YFC0501605) 中国科学院水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(A314021402-1602)
【分类号】：S153.6
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