本文選題：天然林 + 赤紅壤�。� 參考：《廣西大學》2017年碩士論文

【摘要】：隨著全球碳循環(huán)研究的不斷深入,一個區(qū)域范圍的碳庫收支平衡研究也在不斷加深。符合采樣標準的天然林典型樣地較少,本研究選擇了 5個廣西天然林或次生天然林樣地0-80cm赤紅壤作為研究對象,進行野外調(diào)查采樣、對比采樣,室內(nèi)采用物理化學分析法對赤紅壤土壤樣品進行深入分析對比,測定估算了土壤碳、氮、磷含量和儲量,并分析三種元素間的相關(guān)關(guān)系;同時采用紅外光譜分析法、燒失量法分析了赤紅壤一些基本特征。研究得到主要結(jié)論為:(1)廣西天然林赤紅壤平均有機碳儲量為108.29 t/hm2,分布表現(xiàn)為表層土壤碳儲量最高,占整個土壤碳庫比例的42%以上,碳含量、碳儲量隨著土壤深度而降低;化學分組研究表明,惰性碳庫慢性碳庫活性碳庫,土壤有機碳主要是難分解態(tài)有機碳為主,所占比例達72%以上;有機碳含量跟土壤母巖、植被類型等密切相關(guān),總的來說天然林下赤紅壤干擾少,生物氣候條件優(yōu)越,有機碳含量較高。(2)天然林下赤紅壤氮元素分布特征、變化趨勢與有機碳相似,氮元素主要是以有機氮的形式存在,氮儲量為10.44 t/hm2;土壤母質(zhì)和土壤的性質(zhì)、氣候條件主要決定了天然林下赤紅壤磷庫特征,磷元素主要是無機態(tài)形式存在,磷儲量為8.23 t/hm2;土壤C、N、P元素相關(guān)性分析結(jié)果表明,赤紅壤天然林土壤C與N元素間表現(xiàn)出極顯著正相關(guān)性,C與P、N與P元素間表現(xiàn)為不顯著正相關(guān)。(3)赤紅壤燒失量特征結(jié)果表明,由于表層土壤有機質(zhì)含量較大,土壤表層燒失量明顯大于下層土壤,相比污染較大的化學分析法,燒失量法也可以用于測定有機質(zhì)含量;在250-350℃間土壤燒失量出現(xiàn)小峰值,而后失量趨于平緩,前期失量主要是腐殖質(zhì)的分解,同時損失物質(zhì)可能還有有機質(zhì)、結(jié)合水等;隨著溫度的升高,土壤損失物質(zhì)為多糖、纖維素,450℃后失量逐漸增大,主要是多環(huán)芳香族類物質(zhì)的分解,但是仍然包括部分結(jié)合水、碳酸鹽、二氧化硫等。(4)赤紅壤的紅外光譜圖表現(xiàn)為高嶺石型的圖譜,表明赤紅壤礦物以高嶺石為主,伴生礦物有伊利石、蒙脫石、針鐵礦物等;赤紅壤振動化學鍵及官能團為:自由水、Al-O-Si、Si-O-Fe、Si-O-Si、C=O、C=C等;其中顯著的3695、3620、1035、915cm-1峰以及790cm-1峰可作為用紅外光譜判斷南亞熱帶天然林赤紅壤特征峰。
[Abstract]:With the development of the global carbon cycle, a regional study of carbon pool balance is becoming more and more important. There are few typical plots of natural forest in accordance with the sampling criteria. In this study, 5 natural or secondary forest plots of 0-80cm red soil were selected as the research objects, and the field investigation and sampling were carried out, and the samples were compared. The soil samples of lateritic red soil were analyzed and compared with each other by physicochemical analysis in laboratory. The contents and reserves of carbon, nitrogen and phosphorus in the soil were measured and estimated, and the correlation between the three elements was analyzed. Some basic characteristics of lateritic red soil were analyzed by burning loss method. The main conclusions are as follows: (1) the average organic carbon storage of red soil in Guangxi natural forest is 108.29 t / hm ~ (2). The distribution shows that the surface soil has the highest carbon storage, accounting for more than 42% of the total soil carbon pool. The carbon content and carbon storage decrease with the depth of the soil. The chemical grouping study showed that the active carbon pool of inert carbon pool, soil organic carbon is mainly indecomposable organic carbon, accounting for more than 72%, the content of organic carbon is closely related to soil parent rock, vegetation type and so on. On the whole, under natural forest, there is little interference, favorable bioclimatic condition, high organic carbon content.) the distribution of nitrogen elements in red soil under natural forest is similar to that of organic carbon, and the nitrogen element mainly exists in the form of organic nitrogen. Nitrogen storage was 10.44 t / hm ~ (-2). Soil parent material, soil properties and climatic conditions mainly determined the characteristics of phosphorus pool in lateritic red soil under natural forest. Phosphorus existed mainly in inorganic form, and phosphorus storage was 8.23 t / hm ~ (2). There was a very significant positive correlation between the elements of C and N in the natural forest soil of lateritic red soil. There was no significant positive correlation between the elements of C and Pu N and P) the results showed that the content of organic matter in the surface soil was higher than that in the surface soil, and the results showed that there was no significant positive correlation between the elements of C and N in the red soil. The amount of burning loss in the surface layer of soil is obviously larger than that in the lower soil. Compared with the chemical analysis method, the method of burning loss can also be used to determine the content of organic matter, and between 250 鈩，

本文編號：1906389