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人工樟子松林对毛乌素沙地土壤颗粒组成和固碳效果的长期影响
王丽梅1, 张谦1, 白利华1, 马爱生1, 张红1, 李利敏1, 张建国1,2, 付广军3, 董强3
1.西北农林科技大学 资源环境学院, 陕西 杨凌 712100;2.西北农林科技大学 黄土高原 土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100;3.陕西省治沙研究所, 陕西 榆林 719000
摘要:
[目的]探讨人工樟子松林对毛乌素沙地土壤颗粒组成和固碳的长期影响,为综合评价沙地植被恢复的生态环境效应提供科学依据。[方法]选择毛乌素沙地东南缘人工栽植21,36和56 a的樟子松林和流沙地为采样地,对0-30 cm的土壤进行了分层取样分析,以探讨人工林建设对半干旱荒漠区土壤颗粒组成及不同粒级含碳量的长期影响。[结果]随着栽植年限的增加,土壤颗粒呈逐渐细化的趋势,且表层(0-5 cm)细颗粒含量均高于下层(5-30 cm)。造林后土壤有机碳(SOC)和无机碳(SIC)含量均显著增加,最高值分别是流沙地的4.90倍和4.32倍;栽植年限对SOC含量和土壤有机碳密度(SOCD)的影响大于SIC含量和土壤无机碳密度(SICD)。相对于流沙地,各粒级SOC,SIC含量均在栽植56 a样地增幅最大,且均在细砂粒组分中增幅最大。团聚体和粉黏粒有机碳含量与土壤总有机碳含量之间存在显著的线性相关关系(p<0.01),粗砂粒和粉黏粒有机碳对总有机碳的贡献率和粉黏粒无机碳对总无机碳的贡献率较为显著(p<0.05)。[结论]随着樟子松栽植年限的增加,土壤团聚体、粉黏粒含量和土壤固碳能力均显著提高。
关键词:  土壤颗粒组成  土壤有机碳  土壤无机碳  樟子松  毛乌素沙地
DOI:10.13961/j.cnki.stbctb.2019.04.014
分类号:S151+.3;S728.4
基金项目:国家自然科学基金项目"塔克拉玛干沙漠咸水滴灌林地土壤碳时空分布与淋溶过程研究"(41877541), "塔里木沙漠公路防护林土壤盐结皮的生态环境效应与作用机制" (41471222);中科院水土保持研究所青年人才专项
Long-term Effects of Pinus Sylvestris Afforestation on Soil Particle Composition and Carbon Sequestration in Mu Us Sandy Land
Wang Limei1, Zhang Qian1, Bai Lihua1, Ma Aisheng1, Zhang Hong1, Li Limin1, Zhang Jianguo1,2, Fu Guangjun3, Dong Qiang3
1.College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;3.Desert Control Research Institute of Shaanxi Province, Yulin, Shaanxi 719000, China
Abstract:
[Objective] The long-term effects of Pinus sylvestris var. mongolica afforestation on soil particle composition and carbon sequestration in Mu Us Sandy Land were studied in order to provide a scientific basis for comprehensive evaluation of ecological environment effects of vegetation restoration.[Methods] Artificial Pinus sylvestris with different shelterbelt planted years(21 years, 36 years, 56 years) and shifting sandy land were selected as sampling sites on the southeastern margin of the Mu Us sandy land, and 0-30 cm soils were collected and analyzed layer by layer to explore the long-term effects of plantation construction on soil particle composition and carbon conteunder different particles grades in semi-arid desert areas.[Results] With the increase of planting years, the soil particles became finer gradually, and content of fine particles in the surface layer(0-5 cm) were higher than beneath layers(5-30 cm). The contents of soil organic carbon(SOC) and inorganic carbon(SIC) increased significantly after shelterbelt construction, and the highest values were 4.90 times and 4.32 times of the shifting sandy land, respectively. The effect of shelterbelt age on SOC content and SOC density(SOCD) was more significant than SIC content and SIC density(SICD). Compared with the shifting sandy land, SOC and SIC contents of each particle size increased most obvious in the shelterbelt planted for 56 years, and the increase of amplitude was largest in fine sand. There were significant linear correlations between organic carbon content of aggregate and silt-clay and total soil organic carbon content, respectively(p<0.01). The contribution rates of organic carbon in coarse sand and silt-clay to total organic carbon, inorganic carbon in silt-clay to total inorganic carbon were significant, respectively(p<0.05).[Conclusion] The contents of soil aggregates and silt-clay particles and soil carbon sequestration capacity were significantly improved with the increase of Pinus sylvestris shelterbelt age.
Key words:  soil particle composition  soil organic carbon  soil inorganic carbon  Pinus sylvestris  Mu Us sandy land