不同平茬高度对沙柳生长状况的影响研究

发布时间：2018-01-15 17:45

本文关键词：不同平茬高度对沙柳生长状况的影响研究　出处：《内蒙古农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：沙柳(Salix Psammophila)是防风固沙和保持水土的优良树种,也是沙区重要的工业原料林树种,通过平茬对其更新复壮,对沙柳林的经营具有重要意义。本研究以达拉特旗白土梁林场人工沙柳林为研究对象,采用有间隔0cm、5 cmm、10 cm和15 cm四种平茬高度、0 cm平茬高度连续实验,分析人工沙柳林的生长动态规律和林间草本植被的生长情况,结果表明:(1)间隔平茬对沙柳的生长状况具有促进作用,对丛高、冠幅和枝条数量的影响显著,除了沙柳基径外,沙柳的其它生长指标,均以平茬高度0 cm为宜。(2)连续每年平茬抑制沙柳生长,每3年平茬一次,沙柳才能旺盛生长。(3)间隔平茬高度为0 cm时,沙柳的生物量及固碳量最大,碳汇功能最优,而连续每年平茬,沙柳的生物量及碳储量逐年降低,碳汇功能也逐渐减弱。(4)平茬高度为5 cm时,沙柳林下草本植被的植被高度和生物量平均值最大:平茬高度为10 cm时,林下草本植被的植被密度和盖度平均值最大;沙柳林周围草地的草本植被与沙柳林下草本植被的生物多样性不同,草地为蓝刺头、苦豆子和沙蒿为主的植被,种植沙柳后形成了沙柳、披针叶黄华、砂珍棘豆、猪毛菜、刺蓼和羊草等草本植被的灌草复合植被。而草地的草本植被生长状况远远优越于样地里面沙柳林下草本植被的生长状况。
[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.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S793.9

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