本文關(guān)鍵詞：基于穩(wěn)定性同位素技術(shù)荒漠植物紅砂水分來(lái)源的研究　出處：《內(nèi)蒙古農(nóng)業(yè)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： 紅砂 水分來(lái)源 穩(wěn)定性氫氧同位素 土壤水分

【摘要】：本研究選擇額濟(jì)納荒漠區(qū)三個(gè)典型紅砂群落為樣地,通過(guò)分析樣地土壤的理化性質(zhì)以及紅砂的含水率和水勢(shì),同時(shí)對(duì)紅砂的莖干水、降水、各土層的土壤水以及地下水的氫氧穩(wěn)定性同位素(δD和δ18O值)進(jìn)行測(cè)定,運(yùn)用二源或三源線性混合模型、多元線性混合模型、耦合模型以及吸水深度模型對(duì)各樣地紅砂的水分來(lái)源進(jìn)行分析,得到紅砂的主要水分來(lái)源。研究結(jié)果如下:(1)Ⅰ號(hào)樣地烏蘭圖格嘎查,紅砂為主要優(yōu)勢(shì)種,土壤質(zhì)地的主要類型為砂土,地下水水位在220cm 土層處。Ⅱ號(hào)樣地天鵝湖路北,紅砂為單一優(yōu)勢(shì)種,土壤質(zhì)地的主要類型為砂土。Ⅲ號(hào)樣地火車站東北方向,紅砂為主要優(yōu)勢(shì)種,土壤質(zhì)地的主要類型為砂壤土和砂土。三個(gè)樣地土壤類型為灰棕漠土。土壤容重為1.46～1.76g/c m3,紅砂生長(zhǎng)的土壤環(huán)境呈堿性(pH8.02～8.97),土壤電導(dǎo)率為0.06～2.25ms/cm。土壤含水率為0.187%～20.23%,土壤水勢(shì)為-2.99～-12.09Mpa。(2)紅砂葉片含水率為18.032%～38.063%,紅砂根、莖、葉水勢(shì)均值分別為-8.61Mpa、-8.89Mpa、-9.71Mpa。Ⅰ號(hào)樣地紅砂主要的吸水根系分布在90cm～170cm土層,Ⅱ號(hào)樣地紅砂主要的吸水根系分布在70～80cm 土層;Ⅲ號(hào)樣地紅砂主要的吸水根系分布在50～90cm 土層。(3)不同樣地紅砂的吸水層位不同。Ⅰ號(hào)樣地紅砂主要吸水層位在130～220cm,對(duì)應(yīng)的土壤含水率為8.55%～20.23%。Ⅱ號(hào)樣地紅砂主要吸水層位在70～100cm,對(duì)應(yīng)的土壤含水率為1.28%。Ⅲ號(hào)樣地紅砂主要吸水層位在70～100cm,對(duì)應(yīng)的土壤含水率為2.08%。隨著根系不斷的生長(zhǎng),紅砂的吸水層位逐漸延伸到更深土層。(4)通過(guò)模型確定紅砂的生長(zhǎng)發(fā)育依賴于較穩(wěn)定的土壤水分。在Ⅰ號(hào)樣地,紅砂吸收并且利用最多的是130～160cm處的土壤水,平均吸水深度位于100～130cm土層;在Ⅱ號(hào)樣地,紅砂主要利用70～100cm處的土壤水,平均吸水深度位于50～70cm土層;在Ⅲ號(hào)樣地,紅砂對(duì)70～100cm處的土壤水利用較多,平均吸水深度位于70～100cm 土層。
[Abstract]:This study selected three typical Ejina desert area red sand community as the sample, through the analysis of physicochemical properties of soil and red sand water content and water potential, while the red sand stem water, precipitation, soil water and groundwater and oxygen isotope (delta D and delta 18O) were measured using two or three source linear mixed model, multivariate linear mixed model, analyzes the water source coupling model and the model of the water depth of red sand, get the main water source of red sand. The results are as follows: (1) 1 kind of Ulan tug GaZha, red sand as the main dominant species. The main types of soil texture is sandy soil, the groundwater level in the depth of 220cm. 2 kind of Swan Lake North, red sand as the single dominant species, the main types of soil texture sand. III kind of train station northeast, red sand was the dominant species in soil. The main types of soil texture is sandy loam and sandy soil. Three soil types for the grey brown desert soil. Soil bulk density is 1.46 ~ 1.76g/c m3, the growth of red sand soil environment is alkaline (pH8.02 ~ 8.97), 0.06 ~ 0.187% soil conductivity ~ 20.23% 2.25ms/cm. soil water content, soil water potential was -2.99 -12.09Mpa. ~ (2) red sand leaf water content is 18.032% ~ 38.063%, red sand root, stem, leaf water potential values are -8.61Mpa, -8.89Mpa, -9.71Mpa., 1 kind of red sand fine roots were mainly distributed in the 90cm ~ 170cm soil layer, the water absorption of root distribution in 70 ~ 80cm soil layer II plots mainly red sand the third kind of red sand; the fine roots were mainly distributed in 50 ~ 90cm soil layer. (3) the water layer is not as red sand. I like the red sand main water layer in 130 ~ 220cm soil water content corresponding to the rate of 8.55% ~ 20.23%. II kind of red sand main absorption layer In 70 ~ 100cm soil water content corresponding to the rate of 1.28%. III kind of red sand is mainly water layer in 70 ~ 100cm soil water content corresponding to the rate of 2.08%. with root growth continuously, the water layer red sand gradually extended to deeper layers. (4) through the model to determine the red sand growth dependence in the soil water stable. In No.1 plots, red sand absorption and use the most is the 130 ~ 160cm soil water, the average water depth is 100 ~ 130cm soil layer; in No. 2 plots, red sand mainly by 70 ~ 100cm of soil water, the average water depth is 50 ~ 70cm soil; in III plots, the red sand on the 70 ~ 100cm soil water more, the average water depth is 70 ~ 100cm soil layer.

【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q948

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 閆建成;梁存柱;付曉s，

本文編號(hào)：1393236