| 黄土高原高寒区不同人工林土壤养分及生态化学计量特征 |
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| 引用本文： | 刘若莎,王冬梅.黄土高原高寒区不同人工林土壤养分及生态化学计量特征[J].北京林业大学学报,2021,43(1):88-95. |
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| 作者姓名： | 刘若莎 王冬梅 |
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| 作者单位： | 北京林业大学水土保持学院，北京 100083 |
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| 基金项目： | 国家重点研发计划重点专项课题 |
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| 摘 要： | 目的]通过分析黄土高寒区不同人工林和不同土层的土壤养分和生态化学计量变化,旨在阐明不同人工林土壤养分和化学计量特征,揭示土壤养分和化学计量随土层深度的变化规律.方法]以青海黄土高寒区退耕的人工林地(包括青海云杉、华北落叶松、青杨、白桦)为研究对象,以自然退耕的草地和农田为对照,测定了6种植被类型在0～20 cm、2...
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| 关 键 词： | 黄土高原高寒区 人工林 土壤养分 生态化学计量 |
| 收稿时间： | 2020-05-18 |
Soil nutrients and ecostoichiometric characteristics of different plantations in the alpine region of the Loess Plateau |
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| Liu Ruosha,Wang Dongmei.Soil nutrients and ecostoichiometric characteristics of different plantations in the alpine region of the Loess Plateau[J].Journal of Beijing Forestry University,2021,43(1):88-95. |
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| Authors: | Liu Ruosha Wang Dongmei |
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| Institution: | School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China |
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| Abstract: | Objective]By analyzing the changes of soil nutrients and ecostoichiometry in different plantations and varied soil layers in the alpine region of the Loess Plateau,this paper aims to clarify the soil nutrients and stoichiometric characteristics under different plantations,and to reveal the laws of soil nutrients and stoichiometric changes with soil depth.Method]In this paper,plantations(including Picea crassifolia,Larix principis-rupprechtii,Populus cathayana,Betula platyphylla)in the alpine region of the Loess Plateau in Qinghai Province,northwestern China were taken as the research objects,and the grassland of natural conversion and cropland were taken as control. C, N and P contents and stoichiometry ratios of sixvegetation types in 0-20 cm, 20-40 cm and 40-60 cm soil layers were determined. Result] (1) The soil Cand N contents of different plantations in the alpine region of the Loess Plateau were significantly different(P < 0.05), and the difference of soil P content was partially significant. The C and N contents in each soillayer of plantations were significantly higher than those of grassland and cropland, and the organic carbonand total nitrogen contents in 0-20 cm topsoil of Populus cathayana were the highest, which were 25.82 and2.17 g/kg, respectively. (2) The soil ecostoichiometry of different plantations in the alpine region of theLoess Plateau was significantly different (P < 0.05). The C∶N of plantations in 0-60 cm soil layer wassignificantly lower than cropland, while the C∶P and N∶P were higher than those of grassland and cropland(P < 0.05). The ecostoichiometry of Populus cathayana in 0-20 cm topsoil was higher than other plantationtypes, with C∶N, C∶P and N∶P being 11.99, 43.27 and 3.64, respectively. (3) Correlation analysis showedthat the organic carbon in the study area had the closest correlation with total nitrogen (P < 0.01), the totalnitrogen had the closest correlation with soil C∶N and N∶P (P < 0.01), and the organic carbon had the closestcorrelation with soil C∶P (P < 0.01). This indicated that the responses of soil C and N in the study area todifferent plantations were consistent. The soil C∶N and N∶P were mainly affected by total nitrogen, and theC∶P was mainly affected by organic carbon. (4) In the 0-60 cm soil layer, the soil C, N and P contents ofdifferent vegetation types decreased with the increase of soil depth in the alpine region of the Loess Plateau.The soil ecostoichiometry of the vegetation in the study area had no significant changing trend except forPopulus cathayana, which decreased with the increase of soil depth. This indicated that plantations had thebest improvement effect on the surface soil nutrients. Conclusion] Soil nutrients and ecostoichiometry aresignificantly different in varied plantations, and the nutrient content and stoichiometry of Populus cathayanain topsoil are the highest. Soil nutrients decrease with the increase of soil depth, while soil ecostoichiometrydoes not change significantly with soil depth. |
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| Keywords: | alpine region of the Loess Plateau plantation soil nutrient ecostoichiometry |
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