本文選題：不同連作年限　切入點(diǎn)：植煙土壤　出處：《湖南農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：本研究針對(duì)湖南省煙田耕作制度特點(diǎn),選擇了瀏陽(yáng)、桂陽(yáng)、衡南3個(gè)代表性烤煙產(chǎn)區(qū)煙～稻年內(nèi)復(fù)種連作土壤養(yǎng)分進(jìn)行調(diào)查,根據(jù)烤煙產(chǎn)區(qū)不同連作年限,分別采集連作年限為1、3、4、5、10、20年的土壤樣品,分析土壤的理化性狀(pH值、有機(jī)質(zhì)、全氮、堿解氮、全磷、速效磷、全鉀、速效鉀、緩效鉀、交換性鈣、交換性鎂、有效硫、水溶性氯等指標(biāo)),了解不同連作年限植煙土壤氮、磷、鉀三大必需元素的全量、有效態(tài)含量及其比值；并分析了不同連作年限植煙土壤pH值,有機(jī)質(zhì)、交換性鈣鎂、有效硫、水溶性氯等的含量變化。以期為指導(dǎo)湖南省煙區(qū)的烤煙生產(chǎn)提供理論依據(jù)和數(shù)據(jù)參考。本文主要結(jié)論如下：(1)隨著烤煙種植年限的增加,土壤pH值呈現(xiàn)一定的上升的趨勢(shì),但整體上來(lái)看,變化幅度較�。�(2)瀏陽(yáng)、桂陽(yáng)土壤有機(jī)質(zhì)含量隨連作年限的增加,大體呈現(xiàn)先增加后降低的趨勢(shì),其中最大值出現(xiàn)在4-5年連作的植煙土壤中。(3)植煙土壤中全氮和全鉀含量在土壤中的變化相對(duì)較小,但是全磷有富集的趨勢(shì)；有效態(tài)氮、磷、鉀中,堿解氮呈現(xiàn)緩慢的下降趨勢(shì),有效磷和速效鉀變化規(guī)律不明顯。(4)不同煙區(qū)土壤中交換性鈣變化不一,總體呈平穩(wěn)的趨勢(shì),交換性鎂在不同的種植年限中變化也不一,但總體呈下降趨勢(shì)。有效硫呈先下降后上升趨勢(shì),水溶性氯,年際變化較小。(5)土壤氮/磷比呈現(xiàn)先增加后降低趨勢(shì),氮/鉀比在三個(gè)代表區(qū)域呈現(xiàn)不同的變化規(guī)律,磷/鉀比在瀏陽(yáng)所調(diào)查煙區(qū)總體呈先升后降的趨勢(shì),桂陽(yáng)和衡南調(diào)查煙區(qū)總體呈下降趨勢(shì)。
[Abstract]:According to the characteristics of tobacco farming system in Hunan Province, three representative flue-cured tobacco production areas, Liuyang, Guiyang and Hengnan, were selected to investigate the soil nutrients of continuous cropping in tobacco and rice years. Soil samples with continuous cropping years of 1 ~ 3 ~ 3 ~ 4 ~ 5 ~ 5 ~ 10 and 20 years were collected, and the physical and chemical properties of the soil were analyzed, such as pH value, organic matter, total nitrogen, alkali-hydrolyzed nitrogen, total phosphorus, available phosphorus, total potassium, available potassium, slow-acting potassium, exchangeable calcium, exchangeable magnesium, available sulfur. Water soluble chlorine was used to understand the total amount, available state content and ratio of three essential elements in tobacco planting soil with different continuous cropping years, and the pH value, organic matter, exchangeable calcium and magnesium, available sulfur of tobacco planting soil with different successive cropping years were analyzed. The change of water soluble chlorine content is expected to provide theoretical basis and data reference for guiding flue-cured tobacco production in Hunan Province. The main conclusions of this paper are as follows: 1) with the increase of planting years of flue-cured tobacco, the pH value of soil increases to a certain extent. On the whole, however, the range of variation is relatively small.) in Liuyang, the content of soil organic matter in Guiyang increases at first and then decreases with the increase of continuous cropping years. The maximum value of total nitrogen and total potassium content in tobacco planting soil is relatively small, but the total phosphorus is enriched, and the available nitrogen, phosphorus and potassium in available nitrogen, phosphorus and potassium have a slow decreasing trend, and the content of total nitrogen and total potassium in tobacco planting soil is relatively small, but the total phosphorus has a tendency of enrichment, while in available nitrogen, phosphorus, potassium, alkali-hydrolyzed nitrogen shows a slow downward trend. The change of available phosphorus and available potassium is not obvious. 4) the change of exchangeable calcium in different tobacco area is different, the general trend is stable, and the exchangeable magnesium also varies in different planting years. The available sulfur decreased first and then increased, and the water soluble chlorine showed a small annual change. The ratio of N / P increased first and then decreased, and the ratio of N / K changed differently in the area of three represents. The P / K ratio in Liuyang tobacco area increased first and then decreased, and that in Guiyang and Hengnan tobacco areas decreased as a whole.
【學(xué)位授予單位】：湖南農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S572;S158

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本文編號(hào)：1679479