| 色季拉山西坡高海拔区土壤养分含量及化学计量特征 |
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| 引用本文： | 连玉珍,曹丽花,刘合满,杨红.色季拉山西坡高海拔区土壤养分含量及化学计量特征[J].中南林业科技大学学报,2021(1):140-150. |
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| 作者姓名： | 连玉珍 曹丽花 刘合满 杨红 |
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| 作者单位： | 信阳农林学院农学院;西藏农牧学院高原生态研究所;西藏高原森林生态教育部重点实验室;西藏农牧学院资源与环境学院 |
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| 基金项目： | 国家自然科学基金项目(41561052,41461055);国家科技基础性专项项目(2014FY110200);西藏农牧学院研究生创新计划资助项目(YJS2018-13)。 |
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| 摘 要： | 目的]探究高寒生态系统土壤有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)含量及化学计量比的垂直分布特征.方法]以西藏东南部色季拉山西坡海拔4200～4400 m区域为研究区,选择苔草高寒草甸(CAM)、嵩草沼泽化草甸(KSM)、林芝杜鹃灌丛(RTS)和雪山杜鹃灌丛(RAS)4种典型植被类型土壤为研究对象...
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| 关 键 词： | 色季拉山 土壤养分 化学计量比 西藏 |
Characteristics of soil stoichiometric and nutrient contents in high altitude area on the west slope of Sejila mountains |
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| LIAN Yuzhen,CAO Lihua,LIU Heman,YANG Hong.Characteristics of soil stoichiometric and nutrient contents in high altitude area on the west slope of Sejila mountains[J].Journal of Central South Forestry University,2021(1):140-150. |
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| Authors: | LIAN Yuzhen CAO Lihua LIU Heman YANG Hong |
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| Institution: | (College of Agronomy,Xinyang Agriculture and Forestry University,Xinyang 464000,Henan,China;Research Institute of Tibet Plateau Ecology,Tibet Agriculture and Animal Husbandry College,Linzhi 860000,Tibet,China;Tibet Key Laboratory of Forest Ecology in Plateau Area,Ministry of Education,Linzhi 860000,Tibet,China;Faculty of Forest Resources and Environmental Science,Tibet Agriculture and Animal Husbandry College,Linzhi 860000,Tibet,China) |
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| Abstract: | 【Objective】Probe the vertical distribution characteristics of soil organic carbon(SOC), total nitrogen(TN), total phosphorus(TP), total potassium(TK) and stoichiometry in the alpine ecosystem.【Method】Carex alpine meadow(CAM), Kobresia swamp meadow(KSM) and Rhododendron tanastylum shrub(RTS), Rhododendron aganniphum shrub(RAS) were selected as the research objects, which distributed in altitude of 4 200-4 400 m, in the west slope of Sejila mountains, southeast Tibet.Soil samples were taken at depth intervals of 0-10, 10-20, 20-40, 40-60 cm, the content of SOC, TN, TP, TK were measured.【Result】1) Content of SOC, TN and TP decrease with the soil deepens, TK is the opposite, except KSM, Coefficient of variation(CV)is 51.99%, 55.52%, 4.55%, 18.58%, respectively.SOC and TN have obvious surface aggregation characteristics while the vertical changes of TP and TK are relatively stable.The change ranges of SOC, TN, TP, and TK for different vegetation types are 53.41-338.72 g·kg-1, 2.89-15.02 g·kg-1, 0.57-1.00 g·kg-1, 5.59-18.22 g·kg-1, CV is 95.58%, 84.57%, 26.03%, 42.21%, respectively. 2) The ratios of C ∶ P and N ∶ P decrease with the deepening of soil layer, except KSM, and the ratios of C ∶ N is opposite, CV of C ∶ P, N ∶ P, C ∶ N is 37.40%, 37.39%, 12.81% in turn,it shows that the regional soil TP is relatively stable, and the change of SOC with soil layer lags slightly behind TN.The C ∶ N, C ∶ P, N ∶ P ratios of different vegetation types are between 13.85-28.16, 73.34-553.13, and 4.26-29.15.CV is 29.11%, 108.85%, 111.16% in turn, that is, differences in site conditions caused by different vegetation types profoundly affect the soil C ∶ P, N ∶ P ratios. 3) The average values of SOC and TN in this study area were 139.65 g·kg-1 and 6.74 g·kg-1, respectively, they were both significantly higher than the national average values at 0-10 cm(24.56 g·kg-1, 1.88 g·kg-1). The average values of TP is 0.73 g·kg-1, is slightly lower than national average values at 0-10 cm(0.78 g·kg-1).Compared with the global C∶N(12.40), C∶P(81.90), and N∶P(6.60) levels of forest soils at 0-10 cm, the C∶N ratio and C∶P ratio of the four vegetation types are higher, while N∶P ratio is lower, but except KSM. The C∶N ratio is less than 25 except for RAS, which indicates that the SOC is easily decomposed, and the C∶P ratio of KSM is greater than 200, which indicates that its soil P is less effective, at the same time, the N∶P ratio of KSM is as high as 29.15, and there may be P restrictions. 4) Correlation analysis shows that mechanical composition and bulk density are the main intrinsic factors affecting soil stoichiometry, among them, the C∶P and N∶P ratios are mainly negatively related to bulk density, clay particles and powder particles(P < 0.01), and positively correlated to sand particles(P < 0.01). C∶N ratio was mainly negatively correlated with pH(P < 0.05), and the correlation with bulk density and mechanical composition did not reached a significant level.【Conclusion】The research results can provide theoretical support for soil nutrient supply and cycle research in different vegetation types in alpine environment. |
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| Keywords: | Sejila mountain soil nutrients stoichiometric ratios Tibet |
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