青海省森林土壤微量元素空间分布特征分析及研究

发布时间：2018-06-08 23:13

本文选题：森林土壤 + 微量元素　；参考：《陕西科技大学》2015年硕士论文

【摘要】：青海省作为全国的生态地理屏障,其森林生态系统发挥着非常重要的作用。林地土壤中的微量元素对植被的健康生长状况起着尤为突出的作用。本文结合野外调查和室内分析,研究了黄土丘陵区土壤有效态微量元素铜、铁、锰、锌、硼的分布特征,分析了有效态微量元素对植被生长状况的影响,所取得的主要结论如下:(1)青海省森林土壤有效态微量元素剖面分布均匀,水平分布差异大,其主要原因受成土母质和成土过程影响。不同林型通过生物循环也可以改变土壤中有效态微量元素的含量。(2)青海省林地土壤有效态微量元素整体状况良好;有效态锰普遍缺乏,在今后造林检查工作中可以适量补给有效锰成分高的微肥,以提高土壤有效锰含量;青海省8个地区中海北地区土壤有效态微量元素含量水平最好,黄南地区最差,其余地区整体含量均较好。(3)对土壤有效态微量元素影响因子的分析表明,不同的p H、有机质、常量养分、含水率、孔隙度及土壤类型下土壤有效态微量元素含量的差异明显,其中p H不仅影响土壤中有效态微量元素的转化率,还影响着植被体内酶的活性。几乎所有的影响因子对土壤有效态微量元素含量具有不同程度影响。(4)整体来看混交林的生长状况优于纯林。不同林型下土壤有效态微量元素含量变化较大,其中针阔混交林下的有效锰、有效铁、有效锌、有效硼含量均最大,灌木林下有效铜、有效铁、有效锰含量均最低,乔木阔叶林下有效铁、有效锌含量均最低,除了土壤中有效态微量元素含量的本底值较低外,可能原因与植被对有效态微量元素的吸收性有关。
[Abstract]:Qinghai Province as a national ecological geographical barrier, its forest ecosystem plays a very important role. Trace elements in woodland soil play a particularly important role in the healthy growth of vegetation. Based on field investigation and laboratory analysis, the distribution characteristics of available trace elements copper, iron, manganese, zinc and boron in loess hilly soil were studied, and the effects of available trace elements on vegetation growth were analyzed. The main conclusions are as follows: (1) the distribution of available trace elements in forest soils in Qinghai Province is uniform and the horizontal distribution is different. The main reasons are influenced by the parent material and soil-forming process. Different forest types can also change the content of available trace elements in soil through biological cycle. 2) the total condition of available trace elements in forest land of Qinghai Province is good, and the available manganese is generally lacking. In order to increase the content of available manganese in soil, the content of available trace elements in Haibei region of Qinghai Province is the best, and the content of available trace elements in the south of the Yellow River is the worst in 8 regions of Qinghai Province. The analysis of the influence factors of soil available trace elements showed that the differences of soil available trace elements under different pH, organic matter, constant nutrient, moisture content, porosity and soil type were significant. Ph not only affects the conversion rate of available trace elements in soil, but also affects the activity of enzymes in vegetation. Almost all the influencing factors have different effects on the content of soil available trace elements. 4) on the whole, the growth status of mixed forest is better than that of pure forest. The contents of available trace elements in soil varied greatly under different forest types, among which the available manganese, available iron, available zinc and available boron in coniferous and broad-leaved mixed forest were the largest, and the available copper, available iron and available manganese were the lowest under shrub. The contents of available iron and available zinc were the lowest under Arbor broad-leaved forest. Except for the lower background value of available trace elements in soil, the possible reasons were related to the absorbability of available trace elements in vegetation.
【学位授予单位】：陕西科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S714

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