黄土丘陵区不同侵蚀环境下土壤有机碳对植被恢复的响应

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 黄土丘陵区不同侵蚀环境下土壤有机碳对植被恢复的响应 DOI: 10.5846/stxb201606161168 作者: 作者单位: 西北农林科技大学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,西北农林科技大学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,西北农林科技大学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;中国科学院水利部水土保持研究所,西北农林科技大学林学院 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（41371280）；水利部公益性行业科研专项项目（201501045） Response of soil organic carbon to vegetation restoration in different erosion environments in the hilly-gullied region of the Loess Plateau Author: Affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A＆F University,,State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A＆F University;Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:植被恢复是提高土壤有机碳累积和储存的重要措施。以黄土丘陵区两个典型侵蚀环境下的小流域即黄土区坊塌流域和砒砂岩区满红沟流域退耕坡面为研究对象，分析了土壤有机碳含量（SOCC）、有机碳密度（SOCD）在同一侵蚀环境不同群落下的变化以及在同一群落不同侵蚀环境间的差异，旨在探明不同侵蚀环境下土壤有机碳对植被恢复的响应。结果表明：1）同一侵蚀环境下，与坡耕地相比，自然恢复方式下退耕地植被恢复初期SOCC、SOCD均显著降低，之后随植被恢复均显著升高（P < 0.05）；人工恢复方式下退耕地20-25年柠条锦鸡儿群落和13-14年刺槐群落SOCC、SOCD均显著升高（P < 0.05），说明同一侵蚀环境内，退耕地在两种恢复方式下均能显著提高土壤有机碳累积和储存。2）同一侵蚀环境下，与相近恢复年限的自然恢复群落相比，刺槐群落SOCC、SOCD均显著高于长芒草+铁杆蒿群落（P < 0.05），砒砂岩区柠条锦鸡儿群落SOCC、SOCD均显著低于铁杆蒿群落（P < 0.05），黄土区柠条锦鸡儿群落SOCC显著低于而SOCD显著高于铁杆蒿群落（P < 0.05），说明相同恢复时间内，相对于自然恢复方式，人工刺槐造林在两种侵蚀环境下均能累积与储存较多的土壤有机碳，而柠条锦鸡儿造林在两种侵蚀环境下累积土壤有机碳的效果均不佳，在黄土区储存土壤有机碳效果好于砒砂岩区。3）同一群落下，黄土区人工和自然恢复群落SOCC均高于砒砂岩区；黄土区人工恢复群落SOCD均显著高于而自然恢复群落SOCD均低于砒砂岩区（P < 0.05），说明黄土区人工恢复累积和储存土壤有机碳及自然恢复累积土壤有机碳的效果较好，而砒砂岩区自然恢复储存土壤有机碳的效果较好。 Abstract:Vegetation restoration is one of the most important measures to improve accumulation and storage of soil organic carbon (SOC). The objective of our study was to understand the response of soil organic carbon to vegetation restoration in different erosion environments in the hilly-gullied region of the Loess Plateau. The study was thus conducted on 42 restored slopes and six sloping croplands (control) in the Fangta watershed and the Manhonggou watershed, which are located, respectively, in the Loess area and Sandstone area and is characterized by different erosion environments. Variations in soil organic carbon content (SOCC) and soil organic carbon density (SOCD) among different plant communities in each erosion environment and among different erosion environments for each plant community were analyzed. In each erosion environment, compared with sloping croplands, SOCC and SOCD decreased significantly at the preliminary stage of natural restoration while the increased significantly with the process of restoration (P < 0.05); and significant increases of SOCC and SOCD were also observed for Caragana korshinskii communities (20-25 a) and Robinia pseudoacacia communities (13-14 a). This shows that soil organic carbon could be improved using both natural and artificial means of restoration within each erosion environment. SOCC and SOCD of R. pseudoacacia communities were much higher than those of Stipa bungeana +Artemisia gmelinii communities (15 a) within each erosion environment (P < 0.05); SOCC and SOCD in C. korshinskii communities (20-25 a) were much lower than in A. gmelinii communities (30 a) in the Sandstone area (P < 0.05); and C. korshinskii communities (20-25 a) had much lower SOCC and much higher SOCD than A. gmelinii communities (30 a) in Loess area (P < 0.05). These results indicate that within the same duration of restoration, compared with natural restoration, R. pseudoacacia afforestation could accumulate and store more SOC within each erosion environment. The effectiveness of C. korshinskii afforestation for accumulating SOC was not superior within all erosion environments, however, its effectiveness in storing SOC was superior in the Loess area but not in the Sandstone area. Both artificial and natural communities had higher SOCC in the Loess area than in Sandstone area, and artificial and natural communities had higher SOCD and lower SOCD in the Loess area than in the Sandstone area, respectively. Therefore, in contrast to the Sandstone area, artificial restoration in the Loess area was more effective at accumulating and storing SOC, and natural restoration was superior in accumulating SOC, but not in storing SOC. 参考文献 相似文献 引证文献