典型石漠化治理措施对土壤有机碳、氮及组分的影响
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S714.2

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贵州省科技计划项目(黔科合平台人才[2017]5726号);贵州省优秀青年科技人才支持计划项目(黔科合平台人才[2017]5638);贵州省教育厅青年科技人才成长项目(黔教合KY字[2016]134)


Effects of Typical Rocky Desertification Control Measures on Soil Organic Carbon, Nitrogen, and Components
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    摘要:

    以贵州关岭花江喀斯特峡谷花椒(HJ)、火龙果(HL)、花椒火龙果混交(HHL)、皇竹草(HZ)、苜蓿(MX)、圆柏(YB)、圆柏女贞混交(YBN)、撂荒地(LH)、坡耕地(PD)9种典型石漠化治理措施为研究对象,研究不同治理措施土壤剖面有机碳、全氮含量和储量、水溶性有机碳含量分布规律。结果表明:各治理措施0—20 cm土层土壤有机碳、全氮含量及储量、水溶性有机碳含量均随土壤剖面深度增加而降低,具有明显的表聚现象。其中土壤有机碳、全氮含量0—20 cm土层平均值大小顺序分别为YB > YBN > LH > HJ > MX > PD > HHL > HL > HZ、YBN > YB > LH > PD > MX > HJ > HZ > HHL > HL,土壤有机碳、全氮储量及水溶性有机碳含量也均表现为YB、YBN、LH显著大于其他6种治理措施;各治理措施土壤C/N为7.19~16.35。相关性分析表明,土壤有机碳含量与土壤全氮含量、有机碳储量、水溶性有机碳含量存在极显著相关,土壤容重是土壤碳氮指标的关键因子,具有较好相关性。研究阐明,在今后石漠化治理过程中,退耕还林、撂荒地有利于喀斯特生态环境治理与保护,花椒林可作为喀斯特山区农业生产或生态恢复过程中优先考虑的经济植被类型。

    Abstract:

    Taking nine typical measures for controlling rocky desertification in Huajiang karst Canyon of Guanling, Guizhou Province as test objects, including Zanthoxylum bungeanum (HJ), Hylocereus undulatus (HL), Zanthoxylum bungeanum and Hylocereus undulatus (HHL), Pennisetum hydridum (HZ), Medicago sativa (MX), Sabina chinensis (YB), Sabina chinensis and Ligustrum lucidum (YBN), Bare land (LH), and slope farmland (PD), the distribution of organic carbon, total nitrogen, and water-soluble organic carbon in soil profile under different control measures was studied. The results showed that the contents of soil organic carbon, total nitrogen, reserves and water-soluble organic carbon decreased with the increase of soil profile depth in 0-20 cm soil layers, and the phenomena of surface accumulation were obvious. The order of average soil organic carbon and total nitrogen content in 0-20 cm layer was YB > YBN > LH > HJ > MX > PD > HHL > HL > HZ, YBN > YB > LH > PD > MX > HJ > HZ > HHL, respectively. Soil organic carbon, total nitrogen reserves and water-soluble organic carbon content also showed that YB, YBN, and LH were significantly higher than the other six control measures. Soil C/N of each control measure ranged from 7.19 to 16.35. Correlation analysis showed that soil organic carbon content was significantly correlated with soil total nitrogen content, organic carbon storage and soluble organic carbon content. Soil bulk density was the key factor of soil carbon and nitrogen index, and had a good correlation. The study clarifies that in the process of controlling rocky desertification in the future, returning farmland to forest and abandoning desert land will be beneficial to the control and protection of karst ecological environment. Zanthoxylum bungeanum forest can be regarded as the priority economic vegetation type in the process of agricultural production or ecological restoration in Karst Mountainous areas.

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白义鑫,盛茂银,肖海龙,胡琪娟.典型石漠化治理措施对土壤有机碳、氮及组分的影响[J].水土保持学报,2020,34(1):170~177,185

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  • 收稿日期:2019-07-18
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  • 在线发布日期: 2020-02-15
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