| 黄土高原不同植被群落多样性与土壤有机碳密度关系研究 |
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| 引用本文： | 廖娇娇,窦艳星,安韶山.黄土高原不同植被群落多样性与土壤有机碳密度关系研究[J].水土保持研究,2022,29(4):75-82. |
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| 作者姓名： | 廖娇娇 窦艳星 安韶山 |
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| 作者单位： | (1.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; 2.西北农林科技大学 林学院, 陕西 杨凌 712100) |
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| 摘 要： | 为了探明黄土高原不同植被群落多样性与土壤有机碳密度关系,在黄土高原纸坊沟小流域选取几种典型的植被群落(刺槐Robinia pseudoacacia、铁杆蒿Artemisia gmelinii、长芒草Stipa bungeana、狼牙刺Sophora davidii和柠条Caragana korshinskii),野外调查了植被多样性,同时室内测定0—100 cm土壤有机碳含量、密度以及相关土壤环境因子。结果显示:(1)不同植被群落多样性指数(Margalef丰富度、Mclntosh均匀度和Shannon-Wiener多样性)表现出相同的变化特征。柠条和刺槐群落差异不显著(p>0.05),二者显著低于其他植物群落(p<0.05),长芒草和狼牙刺群落最高,二者之间差异不显著(p>0.05),显著高于其他植物群落(p<0.05); 不同植物群落Simpson优势度指数呈现出相反的变化趋势,刺槐>柠条>铁杆蒿>狼牙刺>长芒草。(2)不同植物群落土壤全氮含量、微生物量碳、微生物量氮、速效养分(硝态氮、铵态氮、速效磷)大致表现为相同的变化特征,均表现为长芒草和狼牙刺群落高于其他群落,而柠条和刺槐群落土壤养分含量低于其他植物群落,不同植物群落土壤pH值表现出相反的变化特征。(3)在垂直方向,土壤有机碳密度随土层深度的增加而逐渐减小,80—100 cm土层土壤有机碳密度最低(p<0.05),0—20 cm土层土壤有机碳密度最高,表现出明显的“表聚性”,相同土层土壤有机碳密度大致表现为长芒草和狼牙刺群落高于其他植物群落。(4)相关性分析显示,不同植物群落多样性指数与有机碳和有机碳密度呈显著或极显著的正相关。冗余分析显示,土壤pH值和微生物量碳含量是主导植被多样性和土壤有机碳密度重要驱动因子; 双因素分析表明植被类型和土层深度对土壤有机碳含量和密度具有显著的影响(p<0.05)。
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| 关 键 词： | 黄土高原 植被类型 群落多样性 土壤有机碳密度 |
Relationship Between Vegetation Community Diversity and Soil Organic Carbon Density on the Loess Plateau |
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| LIAO Jiaojiao,DOU Yanxing,AN Shaoshan.Relationship Between Vegetation Community Diversity and Soil Organic Carbon Density on the Loess Plateau[J].Research of Soil and Water Conservation,2022,29(4):75-82. |
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| Authors: | LIAO Jiaojiao DOU Yanxing AN Shaoshan |
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| Affiliation: | (1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China; 2 College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China) |
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| Abstract: | In order to further explore the effects of vegetation community diversity on the vertical distribution of soil organic carbon on the Loess Plateau, five main vegetation types(Stipa bungeana, Sophora viciifolia, Artemisia sacrorum, Caragana korshinskii, and Robinia pseudoacacia)in Zhifanggou watershed were selected to investigate the vegetation diversity, and soil organic carbon content, density in 0—100 cm soil layer and related soil environmental factors were measured. The results showed that:(1)Shannon-Wiener diversity index, Margalef richness index and Mclntosh evenness index of different vegetation types decreased in the order: Stipa bungeana>Sophora viciifolia>Artemisia sacrorum>Caragana korshinskii>Robinia pseudoacacia; there was no significant difference between Stipa bungeana and Sophora viciifolia(p<0.05), which was significantly higher than that of other plant communities(p>0.05), but there was no significant difference between Caragana korshinskii and Robinia pseudoacacia communities(p<0.05), which was significantly lower than that of other plant communities(p>0.05); the Simpson dominance index of different plant communities showed an opposite trend, and followed the order: Stipa bungeana
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| Keywords: | Loess Plateau vegetation type community diversity soil organic carbon density |
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