本文選題：茶園 + 施肥　； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：一氧化氮(nitric oxide, NO)是大氣污染物的主要成分之一,也是生物地球化學(xué)氮循環(huán)過程中的重要組成部分。施肥農(nóng)田是大氣NO的重要排放源。茶園是我國重要的經(jīng)濟作物之一,且面積居世界首位且氮肥用量高,而有關(guān)中國茶園的NO排放特征及其影響因子的研究卻未見報道。本文以不同施肥處理茶園(常規(guī)施尿素、施有機肥和不施肥對照)為研究對象,利用靜態(tài)暗箱法對NO排放年周期變化的田間原位測定及相關(guān)因素的研究,以期了解亞熱帶典型茶園的NO排放特征、揭示其排放規(guī)律及影響因素,并估算茶園年度NO累積排放量。通過本研究,得出以下結(jié)論：1.茶園施肥處理的NO排放主要集中在3-9月(春夏季)的茶樹生長季,其排放量占全年總累積排放量的58%-73%；2.對照、尿素、有機肥處理的NO年排放量分別為2.85、19.42和17.04kg N·ha-1,施肥顯然大幅度增加了NO排放；3.在整個觀測期內(nèi),常規(guī)施尿素和施有機肥處理的NO年直接排放系數(shù)分別為3.68%和3.15%；4.與茶農(nóng)常規(guī)施尿素處理相比,施有機肥處理顯著降低了約12%的NO年排放量；5.土壤銨態(tài)氮含量是茶園在春夏季NO排放通量變化的主要環(huán)境控制因素。基于田間周年連續(xù)田間觀測表明,相對于其他農(nóng)田生態(tài)系統(tǒng),我國亞熱帶茶園可能是一個不容忽視的NO強排放源,但需多地點多年的長期研究進一步證實。
[Abstract]:Nitric oxide (nitric oxide,) is one of the major components of atmospheric pollutants and an important component of biogeochemical nitrogen cycling. Fertilizing farmland is an important emission source of atmospheric no. Tea garden is one of the most important cash crops in China, and it occupies the first place in the world and has a high nitrogen application rate. However, no emission characteristics and its influencing factors in Chinese tea gardens have not been reported. In this paper, different fertilization treatments (conventional urea, organic fertilizer and no fertilizer control) were used to study the in situ measurement of the annual cycle of no emission in the field and the related factors. In order to understand the characteristics of no emission from typical tea plantations in subtropics, to reveal its emission rules and influence factors, and to estimate the annual no accumulative emissions in tea plantations. Through this study, we draw the following conclusion: 1. The no emission from fertilization treatment was mainly in the growing season of tea plant in March-September (spring and summer), which accounted for 58-73% of the total accumulated emissions. In contrast, the annual no emissions of urea and organic fertilizer treatments were 2.85 ~ 19.42 and 17.04kg N ha-1, respectively. Fertilization obviously increased no emission by a large margin. During the whole observation period, the annual direct no emission coefficients of conventional urea application and organic fertilizer application were 3.68% and 3.15 respectively. Compared with conventional urea application for tea farmers, organic fertilizer treatment significantly reduced the annual no emissions by about 12%. The content of soil ammonium nitrogen is the main environmental control factor for the change of no emission flux in tea garden in spring and summer. Based on the field annual continuous field observations, compared with other farmland ecosystems, China's subtropical tea garden may be a strong no emission source that can not be ignored, but many years of long-term research is needed to further confirm it.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S571.1;S181

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本文編號：2087679