本文關(guān)鍵詞：青藏高原植物-土壤碳氮磷化學(xué)計(jì)量特征及其對(duì)環(huán)境因子的響應(yīng)　出處：《天津師范大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 青藏高原 植物 土壤 化學(xué)計(jì)量學(xué) 影響因子

【摘要】：為闡明青藏高原高寒生態(tài)系統(tǒng)植物-土壤碳氮磷含量及化學(xué)計(jì)量特征,進(jìn)一步研究青藏高原高寒生態(tài)系統(tǒng)碳、氮、磷元素在不同組分間的相互作用規(guī)律與機(jī)制,本研究以青藏高原中東部不同植被類型植物-土壤樣點(diǎn)為研究對(duì)象,通過(guò)野外采樣和室內(nèi)測(cè)定,分析植物-土壤有機(jī)碳、全氮、全磷和C:N、C:P、N:P值的變化特征及其影響因素,初步闡明了青藏高原生態(tài)系統(tǒng)植物-土壤碳氮磷含量及化學(xué)計(jì)量特征及其對(duì)環(huán)境因子的響應(yīng)機(jī)制,并探討了植物-土壤碳氮磷及化學(xué)計(jì)量之間的相關(guān)性,以期揭示青藏高原種群內(nèi)碳氮磷在不同組分間的相互作用與變化規(guī)律,為青藏高原高寒生態(tài)系統(tǒng)植物與土壤間的化學(xué)計(jì)量學(xué)特征研究提供基礎(chǔ)的理論依據(jù)。主要研究結(jié)果如下:(1)本研究中,植物樣品有機(jī)碳含量的平均值為368.23g·kg-1,其中,林地植物有機(jī)碳含量最高,灌叢草地含量最低,且林地植物有機(jī)碳平均值顯著高于灌叢草地、荒草地的有機(jī)碳平均值含量;植物全氮含量的平均值為12.66g·kg-1,林地植物全氮含量最高,灌叢草地全氮含量最低,且林地平均值顯著高于灌叢草地的平均值;植物全磷含量平均值為1.07g·kg-1,其中,荒草地全磷平均值最高,顯著高于灌叢草地和高山草原,而與林地、高寒草甸、草地?zé)o顯著差異。(2)研究區(qū)中植物C:N平均值為31.23,植物C:P平均值為401.52,明顯高于全球平均水平的232;植物N:P平均值為13.68,接近全球水平13.8,同時(shí)略低于全國(guó)水平16.3。具體來(lái)說(shuō),研究區(qū)灌叢草原、高山草原植物主要受P限制,林地、荒草地、高寒草甸植物受到N、P兩種元素的限制或兩種元素都不缺少,草地主要受N限制。(3)研究區(qū)土壤有機(jī)碳、全氮、全磷含量平均值分別為22.01g·kg-1、1.61g·kg-1、0.53g·kg-1,其中,林地SOC、TN、TP含量均最高,荒漠最低。(4)本研究區(qū)表層土壤C:N平均值為15.24,略高于我國(guó)表層土壤C:N值(10～12);研究區(qū)表層土壤C:P平均值為40.1,低于中國(guó)表層土壤C:P值(135.88);研究區(qū)表層土壤N:P平均值為3.02,低于我國(guó)平均水平9.3。(5)垂直方向上,不同植被類型土壤有機(jī)碳、全氮、全磷均呈現(xiàn)下降趨勢(shì),普遍存在表面聚集現(xiàn)象,研究區(qū)剖面土壤C:N、C:P、N:P值對(duì)土壤深度的響應(yīng)差異與土壤TN、TP的來(lái)源差異有密切關(guān)系。N:P作為重要的生理指標(biāo),在本研究區(qū)中除高山草原、鹽堿地N:P值變化趨勢(shì)不大之外,其余植被類型土壤N:P值隨土壤深度的增加呈鋸齒狀下降。(6)由Pearson相關(guān)分析可得,除植物全氮含量與土壤硝態(tài)氮呈顯著正相關(guān)關(guān)系外,植物碳、磷含量與土壤碳氮磷含量及其化學(xué)計(jì)量相關(guān)性均不顯著。本研究中植物碳氮磷及其化學(xué)計(jì)量與土壤C:N、C:P、N:P相關(guān)性不明顯,表現(xiàn)出在同一時(shí)段內(nèi)植物碳氮磷與土壤不完全同步的模式。(7)通過(guò)逐步回歸分析可知,植物OC與粉砂呈負(fù)相關(guān)關(guān)系,TN與黏粒呈負(fù)相關(guān)關(guān)系,TP與土壤無(wú)機(jī)碳呈正相關(guān)關(guān)系,各環(huán)境因子對(duì)植物C:N、C:P、N:P值影響不顯著,變量均未進(jìn)入回歸方程。(8)由逐步回歸方法可知,影響青藏高原土壤SOC的主要因子為pH值;影響土壤TN的因子從大到小依次為土壤Alk、pH值、黏粒含量;對(duì)于土壤TP,環(huán)境因子的影響程度從大到小排序?yàn)橥寥纏H值、海拔、Alk;影響青藏高原土壤C:N值的主要因子為年均溫;對(duì)于C:P值和N:P值,影響最大的環(huán)境因子均為黏粒含量。
[Abstract]:In order to elucidate the plants of Alpine Ecosystem in Tibetan Plateau soil carbon nitrogen and phosphorus content and stoichiometry, further study of Alpine Ecosystem in Qinghai Tibet Plateau of carbon, nitrogen, phosphorus in different components of the interaction between law and mechanism, based on the central eastern Qinghai Tibet Plateau of different vegetation types in plant soil samples as the research object, through the field sampling and laboratory analysis, analysis of plant soil organic carbon, total nitrogen, total phosphorus and C:N, C:P, variation characteristics and its influencing factors of N:P value, illustrates the ecosystem of Qinghai Tibet plateau plant soil carbon nitrogen and phosphorus content and chemical stoichiometry and its response mechanism to environmental factors, and to explore the correlation between plant soil carbon and nitrogen and phosphorus chemical measurement, in order to reveal the Tibetan plateau within populations of carbon nitrogen and phosphorus in different components of the interaction and the change rule of soil and planting for the Alpine Ecosystem The stoichiometry of research provide a theoretical basis for the foundation. The main results are as follows: (1) in this study, the average value of the samples of organic carbon content in plants for 368.23g kg-1, the plant organic carbon content in forest was the highest, and the lowest content of shrub grassland, woodland plant organic carbon was significantly higher than the average shrub grassland, organic carbon the average content of grassland; the average value of total nitrogen content in plant was 12.66g kg-1, the total nitrogen content of woodland plant nitrogen content is highest, the lowest is the shrub meadow, woodland and shrub grassland was significantly higher than the average value; and the total phosphorus content of average value of 1.07g and kg-1, among them, the highest average yearly total phosphorus. Was significantly higher than that of shrub grassland and alpine grassland, and forest, alpine meadow, meadow. There was no significant difference between C:N (2) plants in the study area with an average of 31.23 plants, the average of C:P was 401.52, significantly higher than the global average Of the 232 plants; the average value of N:P is 13.68, close to the global level 13.8, also slightly lower than the national level of 16.3. specifically, study area, shrub steppe and alpine grassland plants mainly limited by P, woodland, grassland, alpine plants such as N, P two elements restrict or two elements are not lack of grass the main limitation of the N. (3) the study area of soil organic carbon, total nitrogen, total phosphorus content average value were 22.01g - kg-1,1.61g - kg-1,0.53g - kg-1, among them, SOC TN, TP in woodland, were the highest, lowest desert. (4) C:N soil layer in the study area, the average value is 15.24, slightly higher than that of soil C:N the surface value (10 ~ 12); soil surface area of C:P with an average of 40.1, lower than Chinese soil C:P values (135.88); N:P in the soils of the study area with an average of 3.02, lower than the average level of China's 9.3. (5) on the vertical direction, different vegetation types, soil organic carbon, total nitrogen, total phosphorus decreased Trend, the phenomenon of surface accumulation, the study area of soil C:N, C:P, N:P value of the difference in response to soil depth and soil TN, the source of the difference of TP is closely related to.N:P as important physiological parameters in the study area, in addition to alpine grassland, saline alkali soil N:P value has little change trend, the vegetation type soil the N:P value with the increase of soil depth with a serrated drop. (6) by Pearson correlation analysis, the total nitrogen content of the plant was positively correlated with soil nitrate nitrogen, carbon, phosphorus content and soil carbon, nitrogen and phosphorus content and the stoichiometric correlation was not significant. In the study of carbon nitrogen and phosphorus plant and chemical measurement and soil C:N, C:P, N:P showed no obvious correlation, in the same period of carbon nitrogen and phosphorus in plant and soil is not completely synchronous mode. (7) by stepwise regression analysis, plant OC was negatively correlated with silt and clay, TN There is negative correlation between TP and soil inorganic carbon positive relationship, the environmental factors of plant C:N, C:P, N:P value is not significantly affected, variable has not entered the regression equation. (8) by the method of stepwise regression, the main factors affecting soil SOC Qinghai Tibet Plateau pH value; factors affecting soil TN from followed by soil Alk, pH value, soil clay content; for TP, environment influence factor from big to small order of pH value of soil, elevation, Alk; the main factors affecting soil C:N value for Tibetan Plateau annual temperature; for the C:P and N:P values, the influence of the environmental factors as the clay content.

【學(xué)位授予單位】：天津師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q948.1

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