| 刘帅楠, 李广, 杨传杰, 杜佳囝, 徐万恒, 谢明君.植被类型对黄土丘陵区土壤碳氮磷化学计量特征的季节变异[J].水土保持学报,2021,35(6):343~349,360 |
| 植被类型对黄土丘陵区土壤碳氮磷化学计量特征的季节变异 |
| Seasonal Variation of Soil Carbon, Nitrogen and Phosphorus Stoichiometry Under Different Vegetation Types in Loess Hilly Region |
| 投稿时间：2021-06-24 |
| DOI：10.13870/j.cnki.stbcxb.2021.06.046 |
| 中文关键词: 黄土丘陵区 植被类型 生长季阶段 土壤碳氮磷 化学计量特征 |
| 英文关键词: loess hilly region vegetation type growing season stage soil carbon, nitrogen and phosphorus stoichiometric characteristics |
| 基金项目:甘肃省重点研究发展计划项目（20YF8NA135）；甘肃省财政专项（GSCZZ-20160909）；陇原人才专项（LRYCZ-2020-1） |
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| 中文摘要: |
| 为探讨植被类型及生长季阶段对土壤碳氮磷生态化学计量特征的影响，揭示黄土丘陵区陆地生态系统养分限制及循环规律。以黄土丘陵区典型荒草地（Grassland）、苜蓿（Medicago Sativa）地、沙棘（Hippophae rhamnoides）灌木地、文冠果（Xanthoceras sorbifolium）林地、云杉（Picea asperata）林地为研究对象，分析其0—60 cm土壤有机碳（SOC）、全氮（TN）、全磷（TP）含量及化学计量比特征在植被类型间及生长季阶段内的差异。结果表明：（1）全生长季下乔木林地土壤SOC、TN、TP含量不同程度地显著高于灌草地0.7%~39.7%（P<0.05），且各植被类型土壤SOC、TN含量均随植被生长而逐渐降低，土壤TP含量在生长季末期有一定的储集；（2）全生长季下5种植被类型土壤化学计量比（C：N、C：P、N：P）均值分别为24.70，77.56，4.26，其C：N、C：P均较全国平均值（12.3，61.0）偏大，而N：P较全国平均值（5.2）小；且该区灌木地土壤化学计量比与荒草地间均存在显著性差异，而乔木林地间土壤化学计量比及草地间土壤C：P、N：P间均无显著性差异；（3）土壤C：N在时间上具有较好的稳定性，同时各植被类型土壤化学计量比在生长季阶段间均表现为生长季旺期>生长季初期>生长季末期，但植被在生长季旺期下N：P （6.37）及生长季末期下C：P （40.84）与全生长季和全国均值的比较趋势相反。植被类型及生长季阶段对土壤养分及化学计量比特征均有一定的影响，同时黄土丘陵区植被生长受土壤N、P养分限制程度为N > P，因此应根据植被类型及生长阶段实际情况，合理施加氮磷肥，进而有助于土壤养分存留，加快生态修复进程。 |
| 英文摘要: |
| In order to explore the effects of vegetation types and growing season stages on ecological stoichiometric characteristics of soil carbon, nitrogen and phosphorus, reveal the nutrient limitation and circulation law of terrestrial ecosystem in Loess Hilly Area,taking the typical grassland, Medicago Sativa land, Hippophae rhamnoides shrub land, Xanthoceras sorbifolium woodland and Picea asperata wood land as the research objects in Loess Hilly Area, we analyzed the contents of organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) of the 0—60 cm soil layer and their stoichiometric ratio characteristics as well as the differences between vegetation types and growth season stages. The results showed that: (1) The contents of SOC, TN and TP of arbor forest land were significantly higher than those of shrub grassland (0.7%~39.7%) in the whole growing season(P<0.05), and the contents of SOC and TN of five vegetation types gradually decreased with the growth of vegetation. The content of TP had a certain accumulation at the end of growing season. (2) In the whole growing season, the mean stoichiometric ratios (C∶N, C∶P and N∶P) of the five vegetation types were 24.70, 77.56 and 4.26, respectively. The C∶N and C∶P were larger than the national average (12.3, 61.0), while the N∶P was smaller than the national average (5.2). There were significant differences in soil stoichiometric ratio between shrub land and wasteland, but there was no significant difference in soil stoichiometric ratio between arbor forest land and in soil C∶P and N∶P between grassland. (3) The soil C∶N had good stability in time. At the same time, the soil stoichiometric ratio of each vegetation type in the growing season stage followed the order of the peak period of the growth season > the early period of the growth season > the end of the growth season. However, the comparison trend of N∶P (6.37) under the peak period of the growth season and C∶P (40.84) under the end of the growth season were opposite to those of the whole growing season and the national average. Vegetation type and growing season stage had a certain impact on soil nutrients and stoichiometric characteristics. Meanwhile, vegetation growth in Loess Hilly Area was limited by soil N rather than soil P. Therefore, nitrogen and phosphorus fertilizer should be reasonably applied according to the actual situation of vegetation type and growing stage, so as to help soil nutrient retention and accelerate the process of ecological restoration. |
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