本文選題：森林土壤 + 微量元素��； 參考：《陜西科技大學(xué)》2015年碩士論文

【摘要】：青海省作為全國(guó)的生態(tài)地理屏障,其森林生態(tài)系統(tǒng)發(fā)揮著非常重要的作用。林地土壤中的微量元素對(duì)植被的健康生長(zhǎng)狀況起著尤為突出的作用。本文結(jié)合野外調(diào)查和室內(nèi)分析,研究了黃土丘陵區(qū)土壤有效態(tài)微量元素銅、鐵、錳、鋅、硼的分布特征,分析了有效態(tài)微量元素對(duì)植被生長(zhǎng)狀況的影響,所取得的主要結(jié)論如下:(1)青海省森林土壤有效態(tài)微量元素剖面分布均勻,水平分布差異大,其主要原因受成土母質(zhì)和成土過程影響。不同林型通過生物循環(huán)也可以改變土壤中有效態(tài)微量元素的含量。(2)青海省林地土壤有效態(tài)微量元素整體狀況良好;有效態(tài)錳普遍缺乏,在今后造林檢查工作中可以適量補(bǔ)給有效錳成分高的微肥,以提高土壤有效錳含量;青海省8個(gè)地區(qū)中海北地區(qū)土壤有效態(tài)微量元素含量水平最好,黃南地區(qū)最差,其余地區(qū)整體含量均較好。(3)對(duì)土壤有效態(tài)微量元素影響因子的分析表明,不同的p H、有機(jī)質(zhì)、常量養(yǎng)分、含水率、孔隙度及土壤類型下土壤有效態(tài)微量元素含量的差異明顯,其中p H不僅影響土壤中有效態(tài)微量元素的轉(zhuǎn)化率,還影響著植被體內(nèi)酶的活性。幾乎所有的影響因子對(duì)土壤有效態(tài)微量元素含量具有不同程度影響。(4)整體來看混交林的生長(zhǎng)狀況優(yōu)于純林。不同林型下土壤有效態(tài)微量元素含量變化較大,其中針闊混交林下的有效錳、有效鐵、有效鋅、有效硼含量均最大,灌木林下有效銅、有效鐵、有效錳含量均最低,喬木闊葉林下有效鐵、有效鋅含量均最低,除了土壤中有效態(tài)微量元素含量的本底值較低外,可能原因與植被對(duì)有效態(tài)微量元素的吸收性有關(guān)。
[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.
【學(xué)位授予單位】：陜西科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S714

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