本文關(guān)鍵詞： 寧夏鹽堿地 暗溝間距 暗溝埋深　出處：《寧夏大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：針對(duì)寧夏吳忠地區(qū)土壤鹽堿化程度高、地下水礦化度高且地下水水位高的情況,結(jié)合國(guó)內(nèi)外暗溝(管)排鹽改堿技術(shù)的經(jīng)驗(yàn),主要研究了暗溝(管)不同間距設(shè)置(T1-3 m、T2-6 m、T3-9 m、T4-15 m)及不同埋深設(shè)置(H1-0.8 m、H2-1.0 m、H3-1.2 m)對(duì)該地區(qū)鹽漬化土壤含鹽量、PH值等指標(biāo)及垂柳生長(zhǎng)狀況的影響,主要結(jié)論如下:(1)不同暗溝間距設(shè)置條件下,地下水位下降速度T1T2T3T4。不同暗溝埋深設(shè)置條件下,地下水位下降速度H3H2H1。排水前期地下水水位下降較慢,排水后期,地下水水位降落速度加快。且各不同處理間,地下水水位下降速度差異較大。(2)暗溝處理能夠明顯降低土壤PH值,但是暗溝間距與埋深對(duì)PH值變化的影響不呈現(xiàn)明顯的規(guī)律性。不同暗溝間距設(shè)置條件下,T1、T2處理對(duì)土壤含鹽量影響程度相似且遠(yuǎn)高于T3、T4;而T3、T4暗溝對(duì)土壤含鹽量影響程度相似。不同暗溝埋深設(shè)置條件下,H2、H3對(duì)土壤含鹽量影響程度相似,且明顯高于H1。(3)不同暗溝間距設(shè)置條件下,暗溝間土壤脫鹽的均勻程度T1T2T3T4。不同暗溝埋深設(shè)置條件下,暗溝間土壤脫鹽的均勻程度H1H2H3。(4)分析比較試驗(yàn)區(qū)及對(duì)照區(qū)不同層次土壤含鹽量的年內(nèi)變化趨勢(shì),就年內(nèi)含鹽量的變化趨勢(shì)來(lái)看:不同暗溝間距設(shè)置條件下,0-20 cm 土層T1、T2的年內(nèi)變化趨勢(shì)相似,T3、T4的年內(nèi)變化趨勢(shì)相似;0-60 cm及0-100 cm 土層T1、T2、T3的年內(nèi)變化趨勢(shì)相似。不同暗溝埋深設(shè)置條件下,0-20 cm 土層H1與H2的年內(nèi)變化趨勢(shì)相似,明顯低于H3;0-60 cm及0-100 cm 土層H2與H3的年內(nèi)變化趨勢(shì)相似,明顯高于H1。(5)不同暗溝間距設(shè)置條件下,T1、T2、T3對(duì)垂柳樹(shù)高及胸徑的影響程度相似,遠(yuǎn)大于T4的樹(shù)高、胸徑增長(zhǎng)率;T2、T3、T4對(duì)冠幅的影響程度相似,遠(yuǎn)小于T1的影響程度。不同暗溝埋深設(shè)置條件下,H2、H3對(duì)樹(shù)高、胸徑、冠幅的影響程度相似,遠(yuǎn)大于H1的影響程度。綜合以上各向指標(biāo),推薦暗溝間距3 m到9 m、埋深1.0 m到1.2 m為寧夏吳忠鹽堿地暗溝(管)排鹽的合理設(shè)置范圍。
[Abstract]:Aiming at the situation of high degree of soil salinization, high degree of groundwater mineralization and high groundwater level in Wu Zhong area of Ningxia, combined with the experience of domestic and foreign technology of removing salt from underground ditch (tube) to alkali. This paper mainly studies the setting of different spacing of dark ditch (pipe) and the setting of H1-0.8 m with different depth of burying, T1-3 mT2-6 mT3-9 mT4-15 m. The effects of H2-1.0 mH3-1.2 m) on the salinization soil salinity and PH value and the growth status of weeping willow were studied. The main conclusions are as follows: 1) under the conditions of different dark furrow spacing. Under the conditions of different buried depth of the deep ditch, the rate of water level falling is H _ 3H _ 2H _ 1. The groundwater level decreases slowly in the early stage of drainage, but in the later stage of drainage. The rate of groundwater level falling was quickened, and among different treatments, the difference of groundwater level drop rate was great. 2) the soil PH value could be obviously reduced by dark ditch treatment. However, the effect of dark ditch spacing and buried depth on PH value was not obvious. The effect of T1T 2 treatment on soil salt content was similar and much higher than that of T3 + T4 treatment. However, the effect of T _ 3N _ T _ 4 dark ditch on soil salt content was similar, and that of H _ 2N _ H _ 3 on soil salt content was similar under the condition of different buried depth. And it was obviously higher than that of H1.t3) under the conditions of different spacing between dark ditches, the uniform degree of desalination of soil was T1T2T3T4. under the conditions of different buried depth of dark ditches. The homogeneity of soil desalination between dark ditches (H1 H 2H 3. 4)) the variation trend of salt content in different layers of soil in experimental area and control area was analyzed and compared. According to the variation trend of salt content in the year, the variation trend of T _ 1 / T _ 2 in 0-20 cm soil layer is similar to that of T _ 3N _ T _ 4 under the condition of different spacing of dark ditch. The variation trend of T _ (1) T _ (2) T _ (2) T _ (3) in 0-60 cm and 0-100 cm soil layers was similar during the year. The variation trend of H _ 1 and H _ 2 in 0-20 cm soil layer is similar to that in H _ 2 layer, which is obviously lower than that in H _ 3. The variation trend of H _ 2 and H _ 3 in 0-60 cm and 0-100 cm soil layers was similar to that in H _ 3 layer, which was significantly higher than that in H _ (1. 5)) T _ (1) T _ (2) T _ (2). The effect of T3 on the height and DBH of weeping willow was similar, which was much larger than that of T4 and the growth rate of DBH. The effect of T _ 2 ~ (2 +) T _ (3) T _ (3) on crown width was similar to that of T _ (1), and the influence of H _ (2) H _ (2) H _ (3) on tree height, DBH and crown width was similar under different conditions of buried depth. The influence degree of H1 is much greater than that of H1. According to the above indexes, it is recommended that the spacing of dark trenches is 3 m to 9 m, and the depth of buried depth is 1.0 m to 1.2 m, which is the reasonable setting range of salt discharge from saline trenches (pipes) in Ningxia Wu Zhong.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：S156.4;S792.12

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 邊榮榮;孫兆軍;李向輝;李惠軍;;西北鹽堿地改良利用技術(shù)研究現(xiàn)狀及展望[J];寧夏工程技術(shù);2016年04期

2 徐云兵;;鹽堿地的改良和應(yīng)用[J];現(xiàn)代園藝;2016年12期

3 陶?qǐng)@;王少麗;許迪;瞿興業(yè);;改進(jìn)暗管排水技術(shù)淤堵防護(hù)措施試驗(yàn)研究[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2016年06期

4 葉素飛;彭秀琴;季亞輝;胡一新;;設(shè)施鹽漬土壤暗管布局方案的優(yōu)選研究[J];山東農(nóng)業(yè)科學(xué);2015年11期

5 李娟;韓霽昌;張揚(yáng);李曉明;張衛(wèi)華;董起廣;雷娜;;蓄排水條件下鹽堿地土壤鹽分運(yùn)移特征研究[J];水土保持研究;2015年03期

6 李霓;王雪;;基于PCA-PP模型的暗管布局綜合效益評(píng)價(jià)[J];江西農(nóng)業(yè)學(xué)報(bào);2015年06期

7 閆玉民;楊倩;李凱;;基于投影尋蹤分類(lèi)模型的暗管優(yōu)化布局[J];湖北農(nóng)業(yè)科學(xué);2015年10期

8 李明;寧立波;盧天梅;;土壤鹽漬化地區(qū)地下水臨界深度確定及其水位調(diào)控[J];灌溉排水學(xué)報(bào);2015年05期

9 孫秀娟;;淺析農(nóng)田水利中的暗管排水技術(shù)[J];民營(yíng)科技;2015年03期

10 蒲勝海;卡拉巴耶夫·努爾金;王新勇;馬雪琴;;暗管排鹽對(duì)吉爾吉斯坦楚河盆地鹽堿地的改良效應(yīng)[J];新疆農(nóng)業(yè)科學(xué);2014年11期

相關(guān)重要報(bào)紙文章 前1條

1 白璐;;國(guó)內(nèi)暗管改堿裝備的新生[N];中國(guó)農(nóng)機(jī)化導(dǎo)報(bào);2013年

相關(guān)碩士學(xué)位論文 前1條

1 代濤;西北干旱區(qū)水鹽動(dòng)態(tài)模擬及排水優(yōu)化模型研究[D];武漢大學(xué);2004年

，

本文編號(hào)：1449489