| 不同植被恢复模式对红砂岩土壤化学性质及抗蚀特征的影响 |
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| 引用本文： | 张杰,郑太辉,肖胜生,廖凯涛.不同植被恢复模式对红砂岩土壤化学性质及抗蚀特征的影响[J].农业工程学报,2018,34(24):115-122. |
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| 作者姓名： | 张杰 郑太辉 肖胜生 廖凯涛 |
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| 作者单位： | 1. 水利部鄱阳湖水资源水生态环境研究中心，南昌 330029; 2. 江西省水土保持科学研究院，南昌 330029; 3. 江西省土壤侵蚀与防治重点实验室，南昌 330029;,2. 江西省水土保持科学研究院，南昌 330029; 3. 江西省土壤侵蚀与防治重点实验室，南昌 330029;,2. 江西省水土保持科学研究院，南昌 330029; 3. 江西省土壤侵蚀与防治重点实验室，南昌 330029;,2. 江西省水土保持科学研究院，南昌 330029; 3. 江西省土壤侵蚀与防治重点实验室，南昌 330029; |
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| 基金项目： | 国家自然科学基金项目（41501289）；水利部鄱阳湖水资源水生态环境研究中心开放基金项目（ZXKT201502）；江西省水利厅科技项目（KT201417，KT201520） |
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| 摘 要： | 通过对不同恢复年限及恢复类型(2a人工恢复湿地松林、5a人工恢复湿地松林、5a自然恢复湿地松林、5a自然恢复荒地和6a种植杨梅园空地)0～30cm红砂岩发育土壤团聚体中有机碳、全磷、全氮分布规律、化学计量比及其与土壤抗蚀性的相关性进行分析,旨在探究红砂岩侵蚀劣地植被恢复过程中土壤养分变化及抗蚀性。结果表明:红砂岩纯裸地土壤养分含量较低,经过不同措施恢复后,土壤理化性质有不同程度的改善。不同类型红砂岩土壤团聚体级配不同。裸地以5 mm粒径团聚体为主,约占60%以上。除自然恢复5a荒地以2～5 mm团聚体为主以外,其余恢复措施的红砂岩土壤均以小于0.25mm粒径微团聚体为主。不同粒径土壤团聚体有机碳、全氮含量均随恢复年限增长呈增加趋势。C、N集中分布在0.25～1 mm团聚体上,尤其是0.5～1 mm团聚体;P则分布较为均匀。采取不同恢复措施后土壤抗蚀性有不同程度的提高,其中结构体破坏率从55.68%降至10%以下。研究区土壤C:N均值为15.0:1;C:P均值为79.7:1;N:P均值为4.0:1。由此可知不同红砂岩发育土壤随着恢复年限而增长,抗蚀性能大幅提升,由于养分主要分布在0.5～5 mm土壤水稳性的团聚体上,而该部分团聚体流失严重,导致土壤养分含量低、土壤抗蚀性差,恢复过程较为困难。
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| 关 键 词： | 土壤 侵蚀 团聚体 化学计量比 抗蚀性 植被恢复 红砂岩侵蚀劣地 |
| 收稿时间： | 2018/6/19 0:00:00 |
| 修稿时间： | 2018/10/15 0:00:00 |
Effects of different vegetative restoration patterns on soil chemical properties and corrosion resistance of soils derived from red sandstone |
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| Zhang Jie,Zheng Taihui,Xiao Shengsheng and Liao Kaitao.Effects of different vegetative restoration patterns on soil chemical properties and corrosion resistance of soils derived from red sandstone[J].Transactions of the Chinese Society of Agricultural Engineering,2018,34(24):115-122. |
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| Authors: | Zhang Jie Zheng Taihui Xiao Shengsheng and Liao Kaitao |
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| Institution: | 1. Research Center of Water Resources and Ecological Environment of Poyang Lake, the Ministry of Water Resources of the People''s Republic of China, Nanchang 330029, China; 2. Jiangxi Institute of Soil and Water Conservation, Nanchang 330029, China; 3. Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China;,2. Jiangxi Institute of Soil and Water Conservation, Nanchang 330029, China; 3. Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China;,2. Jiangxi Institute of Soil and Water Conservation, Nanchang 330029, China; 3. Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China; and 2. Jiangxi Institute of Soil and Water Conservation, Nanchang 330029, China; 3. Jiangxi Provincial Key Laboratory of Soil Erosion and Prevention, Nanchang 330029, China; |
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| Abstract: | Ecological stoichiometry of soil aggregates provides valuable insight into the nature and extent of nutrient limitation. However, our current understanding of the nutrient distribution and ecological stoichiometry of soil aggregates and their correlations is still relatively limited. The red soils derived from red sandstone are prone to water loss and soil erosion due to the poor structure and low retention capacity of water and fertility, leading to the difficulty in vegetation recovery and soil restoration. It is necessary to explore the microscopic mechanism of nutrient dynamic during the process of erosion inferior soil restoration. Several surface (0-30 cm) soil samples were collected from the eroded badlands of red sandstone under different vegetation restoration years and types including the slash pine of 2-year and 5-year artificial restoration, the slash pine of 5-year natural restoration, the wasteland of 5- year natural restoration, and the vacant land in 6-year waxberry garden. Composition and stability of soil aggregates were determined using dry and wet sieving method. Soil micro-aggregates and mechanical composition were analyzed. Soil organic carbon (C), total nitrogen (N) and phosphorus (P) contents in the aggregates at >10, 5-10, 2-5, 1-2, 0.5-1, 0.25-0.5 and <0.25 mm sizes were determined, and the C, N and P stoichiometric ratios (C:N, C:P and N:P) were calculated. Soil anti- erodibility characteristics including aggregate destruction rate, aggregation degree, dispersion rate and water stable aggregate mean weight diameter (EMWD) were also investigated. The correlations among the ecological stoichiometry of soil aggregates, soil nutrient and anti-erodibility characteristics were further examined. The results showed that the nutrient contents in the bare land were extremely low. After the restoration under different measures, physical and chemical properties of the soils were improved. The aggregate compositions in the soils under different vegetation years and types displayed differences. The bare soil was mainly composed of >5 mm soil aggregates, accounting for more than 60% of the soils. 2-5 mm aggregate dominated in the soils from the wasteland of 5-year natural restoration. The soils developed from red sandstone under the other restoration measures were mainly composed of <0.25 mm aggregates. Soil organic carbon and total nitrogen contents in the aggregates with different sizes increased with the increasing vegetation restoration years. Soil organic carbon and total nitrogen were mainly distributed in the 0.25-1 mm aggregates, especially in the 0.5-1 mm aggregates. The evenly distribution of phosphorus in the aggregates with different sizes was observed. The destruction rates of soil aggregates under different measures decreased from 55.68% (destruction rates of soil aggregates in bare land) to 10%. The mean C:N, C:P and N:P ratios of soils in the area studied were 15.0:1, 79.7:1 and 4.0:1, respectively. Highest C:N and C:P ratios were found in the soils aggregates under the slash pine of 5-year natural restoration, but the lowest C:N and C:P ratios were observed in the vacant land in 6-year waxberry garden. It can be concluded that the soil nutrients for different eroded badlands of red sandstone increase with the increasing vegetation restoration years, and the corrosion resistance of soils has also been greatly improved. Soil nutrients are mainly distributed in the 0.5-5 mm water stable aggregate, which has been seriously lost, resulting in low soil nutrient contents and poor soil corrosion resistance. The results showed that nutrients play a restrictive role in vegetation restoration in eroded badlands of red sandstone. The results obtained by us can provide theoretical basis for soil erosion control and revegetation in eroded badlands of red sandstone. |
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| Keywords: | soil erosion aggregates stoichiometric ratio anti-erodibility vegetative restoration eroded badlands of red sandstone |
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