毛乌素沙地不同植被恢复类型的土壤碳水效应
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1.西北农林科技大学水土保持科学与工程学院(水土保持研究所);2.西北农林科技大学水土保持科学与工程学院(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;3.中国科学院水利部水土保持研究所

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Effects of Soil Organic Carbon and Moisture on Different Vegetation Restoration Types in the Mu Us Sandy Land
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College of Soil and Water Conservation Science and Engineering(Institute of Soil and Water Conservation), Northwest A&F University

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    摘要:

    植被恢复是改善生态环境脆弱区最有效的措施之一。毛乌素沙地大规模的植被恢复显著影响了区域的土壤碳水循环,探究土壤有机碳和水分对植被恢复的响应,对于该区恢复生态系统的可持续发展具有重要意义。本研究以毛乌素沙地自然恢复草地以及沙蒿、沙柳、沙蒿×沙柳(灌灌混交)、樟子松、沙柳×樟子松(乔灌混交)为研究对象,并以裸沙地为对照,研究不同植被恢复类型对0-5 m土壤剖面碳、水的影响。结果表明:(1)植被恢复增加了土壤有机碳含量,沙柳×樟子松、樟子松、草地、沙蒿×沙柳、沙柳、沙蒿依次降低,0-20 cm且显著高于深层,表现为表聚效应,随着土壤深度的增加,各植被类型的有机碳含量逐渐降低。沙蒿、沙柳、沙蒿×沙柳在80-220 cm范围内表现为碳损失。(2)不同植被恢复类型在深层均存在不同程度的水分亏缺,主要集中在1-3 m,具体亏缺程度为沙柳×樟子松>樟子松>沙蒿×沙柳>沙柳>草地>沙蒿。(3)根系是影响土壤有机碳含量和水分消耗的主要因素。土壤有机碳含量与土壤含水量在0-5 m范围内负相关,植被固存有机碳以消耗深层土壤水分为代价,沙柳×樟子松固定同等单位量的碳消耗的水分最少。因此,从土壤固碳和保水两个角度同时考虑,沙柳×樟子松在毛乌素沙地的植被恢复中具有较好的恢复效果。

    Abstract:

    Vegetation restoration is one of the most effective measures to improve the fragile ecological environment in arid regions. Extensive vegetation restoration in the Mu Us Sandy Land has significantly influenced the soil carbon and water cycling within the area. Investigating the responses of soil organic carbon and moisture content to vegetation restoration holds crucial significance for the sustainable development of the ecological system in this region. This study focused on the natural restoration grassland and different vegetation restoration types, including Artemisia desertorum, Salix psammophila, A. desertorum-S. psammophila mixed(shrub-shrub mixed), Pinus sylvestris, S. psammophila-P. sylvestris mixed(tree-shrub mixed), in the Mu Us Sandy Land. A bare sandy area was used as the control. The aim was to investigate the effects of different vegetation restoration types on soil carbon and moisture content within the 0-5 m soil profile. The results showed that:(1)Vegetation restoration increased, with S. psammophila-P. sylvestris mixed, P. sylvestris, Grassland, A. desertorum-S. psammophila mixed, A. desertorum-S. psammophila mixed, and A. desertorum showing decreasing trends, with significant accumulation effects observed within the 0-20 cm soil depth. As soil depth increased, the organic carbon content of all vegetation types gradually decreased. Within the depth range of 80-220 cm, A. desertorum, S. psammophila, and A. desertorum-S. psammophila mixed exhibited carbon loss.(2)Different vegetation restoration types showed varying degrees of soil moisture deficit in deep soil layers, primarily concentrated at 1-3 m, with S. psammophila-P. sylvestris mixed showing the most severe deficit, followed by P. sylvestris, A. desertorum-S. psammophila, S. psammophila, Grassland, A. desertorum.(3)Root were identified as the main factors influencing soil organic carbon content and moisture consumption. Soil organic carbon content exhibited a negative correlation with soil moisture within the 0-5 m soil depth range. Vegetation carbon storage was achieved at the expense of consuming deep soil moisture, with S. psammophila-P. sylvestris mixed exhibiting the least water consumption per unit of fixed carbon. The study suggests that S. psammophila-P. sylvestris mixed exhibits favorable effects in vegetation restoration from the perspective of soil carbon retention and water retention in the Mu Us Sandy Land.

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  • 收稿日期:2023-08-17
  • 最后修改日期:2023-10-14
  • 录用日期:2023-10-18
  • 在线发布日期: 2024-04-29
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