本文關(guān)鍵詞：不同平茬高度對沙柳生長狀況的影響研究　出處：《內(nèi)蒙古農(nóng)業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 沙柳 平茬高度 間隔期 生長指標 林下植被 固碳量

【摘要】：沙柳(Salix Psammophila)是防風固沙和保持水土的優(yōu)良樹種,也是沙區(qū)重要的工業(yè)原料林樹種,通過平茬對其更新復壯,對沙柳林的經(jīng)營具有重要意義。本研究以達拉特旗白土梁林場人工沙柳林為研究對象,采用有間隔0cm、5 cmm、10 cm和15 cm四種平茬高度、0 cm平茬高度連續(xù)實驗,分析人工沙柳林的生長動態(tài)規(guī)律和林間草本植被的生長情況,結(jié)果表明:(1)間隔平茬對沙柳的生長狀況具有促進作用,對叢高、冠幅和枝條數(shù)量的影響顯著,除了沙柳基徑外,沙柳的其它生長指標,均以平茬高度0 cm為宜。(2)連續(xù)每年平茬抑制沙柳生長,每3年平茬一次,沙柳才能旺盛生長。(3)間隔平茬高度為0 cm時,沙柳的生物量及固碳量最大,碳匯功能最優(yōu),而連續(xù)每年平茬,沙柳的生物量及碳儲量逐年降低,碳匯功能也逐漸減弱。(4)平茬高度為5 cm時,沙柳林下草本植被的植被高度和生物量平均值最大:平茬高度為10 cm時,林下草本植被的植被密度和蓋度平均值最大;沙柳林周圍草地的草本植被與沙柳林下草本植被的生物多樣性不同,草地為藍刺頭、苦豆子和沙蒿為主的植被,種植沙柳后形成了沙柳、披針葉黃華、砂珍棘豆、豬毛菜、刺蓼和羊草等草本植被的灌草復合植被。而草地的草本植被生長狀況遠遠優(yōu)越于樣地里面沙柳林下草本植被的生長狀況。
[Abstract]:Salix Psammophila is an excellent tree species for wind and sand fixation and soil and water conservation. It is also an important industrial raw material forest tree in sandy area. In this study, the artificial sand willow forest in Baiduliang Forest Farm of Dalat Banner was used as the research object, with an interval of 0 cm ~ (5) cmm. Four kinds of stubble heights of 10 cm and 15 cm were continuously tested with 0 cm stubble height to analyze the growth dynamic law of artificial sand willow forest and the growth of herbaceous vegetation. The results showed that the growth status of Salix willow was promoted by the spaced stubble, the height, crown width and the number of branches were significantly affected, except for the diameter of Salix willow, other growth indexes were also found. The suitable stubble height was 0 cm. 2) the annual stubble inhibited the growth of Salix willow, and only once every 3 years could the Salix grow vigorously. 3) when the height of the stubble was 0 cm, the stubble height was 0 cm. The biomass and carbon sequestration of Salix willow was the largest, and the carbon sink function was the best, and the biomass and carbon storage of Salix willow decreased year by year, and the carbon sink function decreased gradually when the stubble height was 5 cm. The average vegetation height and biomass of herbaceous vegetation in Shaliu forest were the highest: when the stubble height was 10 cm, the average vegetation density and coverage of undergrowth herbaceous vegetation was the highest. The herbaceous vegetation around the sandy willow forest is different from the herbaceous vegetation under the sand willow forest. The grassland is the main vegetation of the blue prickly, the bitter bean and the Artemisia artemisia. After planting the Salix, the Salix willow and the coniferous leaf Huang Hua are formed. The herbaceous vegetation of Acanthopsis spinosa, Brassica chinensis, Polygonum Polygonum, Leymus chinensis and other herbaceous vegetation is compound vegetation, while the grass vegetation growth condition of grassland is much better than that of grass under the sandy willow forest in the sample plot.
【學位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：S793.9

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