火燒對大興安嶺落葉松天然林土壤團(tuán)聚體有機(jī)碳和黑碳的影響
發(fā)布時(shí)間：2018-09-07 19:49
【摘要】：為了揭示不同強(qiáng)度火燒對大興安嶺落葉松天然林土壤團(tuán)聚體有機(jī)碳和黑碳的影響,本文選取大興安嶺落葉松天然林重度、中度、輕度火燒跡地為研究對象,并以未火燒落葉松天然林為對照,進(jìn)行相關(guān)研究,結(jié)果表明：(1)土壤有機(jī)碳和黑碳具有明顯的表聚特征,0-5 cm層全土有機(jī)碳和黑碳含量顯著高于5-10和10-20 cm層(P0.05.)。重度火燒明顯增加表層土壤有機(jī)碳和黑碳含量。和對照樣地相比,在0-5 cm層,重度火燒跡地全土有機(jī)碳增加了41.56%,黑碳增加了156.44%,黑碳含量增加顯著(P0.05)：中度火燒跡地有機(jī)碳含量降低了6.63%,黑碳增加了46.85%,黑碳含量差異顯著(P0.05)；輕度火燒跡全土有機(jī)碳和黑碳沒有明顯變化。說明重度火燒對土壤有機(jī)碳和黑碳含量的影響較大,主要在0-5 cm層。(2)大興安嶺落葉松天然林土壤干篩團(tuán)聚體和水穩(wěn)性團(tuán)聚體以2mm級為主,經(jīng)不同強(qiáng)度火燒,團(tuán)聚體組成特征表現(xiàn)出異質(zhì)趨向,干篩團(tuán)聚體和水穩(wěn)性團(tuán)聚體PAo.25表現(xiàn)出降低的趨勢,PADo.25和D表現(xiàn)出增大的趨勢,主要表現(xiàn)在表層土壤。水穩(wěn)性團(tuán)聚體的比表面積(MWSSA)隨火燒強(qiáng)度增加而降低,為155.60～169.27 cm2/g,是干篩處理的4倍左右。水穩(wěn)性團(tuán)聚體的MWSSA隨火燒強(qiáng)度的變化規(guī)律與干篩處理相反。說明不同強(qiáng)度的火燒降低了團(tuán)聚體的團(tuán)聚作用,降低了土壤的機(jī)械穩(wěn)定性和水穩(wěn)性,重度和中度火燒表現(xiàn)尤為明顯。(3)4種林型各粒徑干篩團(tuán)聚體有機(jī)碳含量表現(xiàn)為隨粒徑增大而增加,隨土層深度的增加而降低的趨勢。同對照樣地相比,重度火燒顯著提高了0～5 cm土層內(nèi)5mm和0.053 mm團(tuán)聚體有機(jī)碳含量(P0.05),增幅達(dá)177.76%和127.27%。而0.25～2 mm團(tuán)聚體有機(jī)碳含量在3個(gè)土層內(nèi)較對照均有不同程度的降低,中度與輕度火燒跡地干篩團(tuán)聚體有機(jī)碳含量變化與重度火燒跡地相似。重度火燒增加了0-5 cm層各級水穩(wěn)性團(tuán)聚體有機(jī)碳含量,而中度、輕度火燒跡地各粒徑水穩(wěn)性團(tuán)聚體有機(jī)碳含量變化不明顯。(4)干篩團(tuán)聚體中黑碳的分布規(guī)律與有機(jī)碳相似。重度火燒跡地0-5 cm層5mm、2～5 mm、0.053～0.25 mm、＜0.053 mm干篩團(tuán)聚體黑碳含量分別增加了4.92、4.19、1.06、0.44 g/kg,與對照之間的差異均達(dá)顯著水平(P0.05)。中度和輕度火燒跡地干篩團(tuán)聚體黑碳含量變化與重度火燒跡地相似。重度火燒明顯增加了三個(gè)土層各粒徑水穩(wěn)性團(tuán)聚體黑碳含量(P0.05),中輕度火燒跡地水穩(wěn)性團(tuán)聚體黑碳含量變化較小。(5)各級團(tuán)聚體BC/SOC比值在0.05～0.45之間,且不同強(qiáng)度火燒明顯增加了各級干篩團(tuán)聚體和水穩(wěn)性團(tuán)聚體的BC/SOC比值。(6)相關(guān)分析表明,全土有機(jī)碳和黑碳以及各粒徑干篩團(tuán)聚體有機(jī)碳和黑碳含量之間有顯著的線性關(guān)系,而水穩(wěn)性團(tuán)聚體有機(jī)碳和黑碳之間線性相關(guān)性較低。
[Abstract]:In order to reveal the effects of different burning intensities on soil aggregates organic carbon and black carbon in Larix gmelinii natural forest, the heavy, moderate and light burned areas of Larix gmelinii natural forest were selected as the research objects, and the unfired Larix gmelinii natural forest as the control, the results showed that: (1) Soil organic carbon and black carbon were correlated. The contents of organic carbon and black carbon in 0-5 cm layer soil were significantly higher than those in 5-10 and 10-20 cm layers (P (P 0.05): The content of organic carbon decreased by 6.63%, black carbon increased by 46.85%, black carbon content was significantly different (P 0.05); the content of organic carbon and black carbon had no significant change in the whole soil of light burning. Dry-sieve aggregates and water-stable aggregates were mainly of 2mm grade, and the compositions of aggregates showed heterogeneous tendency after different burning intensities. Dry-sieve aggregates and water-stable aggregates PAo.25 showed a decreasing trend, while PADo.25 and D showed an increasing trend, mainly in surface soil. Specific surface area (MWSSA) of water-stable aggregates increased with fire. The variation of MWSSA of water-stable aggregates with fire intensity was contrary to that of dry sieve treatment. The results showed that the agglomeration of aggregates was reduced by different intensity of fire, and the mechanical stability and water stability of soil were decreased, especially in severe and moderate fire. (3) The organic carbon content of dry sieve aggregates increased with the increase of grain size and decreased with the increase of soil depth. Compared with the control plots, the organic carbon content of 5 mm and 0.053 mm aggregates in 0-5 cm soil layers increased significantly (P 0.05), with an increase of 177.76% and 127.27%. The content of organic carbon in dry-sifted aggregates in moderate and light burning sites was similar to that in severe burning sites. The content of organic carbon in water-stable aggregates in 0-5 cm layers was increased by severe burning, while that in water-stable aggregates in moderate and light burning sites was increased by moderate and light burning. (4) The distribution of black carbon in dry-sieve agglomerates was similar to that of organic carbon. The black carbon content of 0-5 cm layer, 2-5 mm, 0.053-0.25 mm, 0.053 mm and < 0.053 mm dry-sieve agglomerates increased by 4.92, 4.19, 1.06, 0.44 g/kg, respectively, and the difference between the two groups was significant (P 0.05). The change of black carbon content of aggregates was similar to that of heavy burning. The heavy burning significantly increased the black carbon content of water-stable aggregates with different particle sizes in three soil layers (P 0.05), and the change of black carbon content of water-stable aggregates with moderate and light burning was small. (5) The BC/SOC ratio of all kinds of aggregates ranged from 0.05 to 0.45, and the different burning intensities significantly increased the dryness of all grades. (6) Correlation analysis showed that there was a significant linear relationship between organic carbon and black carbon in the whole soil and the content of organic carbon and black carbon in the dry-sieve aggregates with different sizes, while the linear correlation between organic carbon and black carbon in the water-stable aggregates was lower.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：S714.2
本文編號(hào)：2229249
[Abstract]:In order to reveal the effects of different burning intensities on soil aggregates organic carbon and black carbon in Larix gmelinii natural forest, the heavy, moderate and light burned areas of Larix gmelinii natural forest were selected as the research objects, and the unfired Larix gmelinii natural forest as the control, the results showed that: (1) Soil organic carbon and black carbon were correlated. The contents of organic carbon and black carbon in 0-5 cm layer soil were significantly higher than those in 5-10 and 10-20 cm layers (P (P 0.05): The content of organic carbon decreased by 6.63%, black carbon increased by 46.85%, black carbon content was significantly different (P 0.05); the content of organic carbon and black carbon had no significant change in the whole soil of light burning. Dry-sieve aggregates and water-stable aggregates were mainly of 2mm grade, and the compositions of aggregates showed heterogeneous tendency after different burning intensities. Dry-sieve aggregates and water-stable aggregates PAo.25 showed a decreasing trend, while PADo.25 and D showed an increasing trend, mainly in surface soil. Specific surface area (MWSSA) of water-stable aggregates increased with fire. The variation of MWSSA of water-stable aggregates with fire intensity was contrary to that of dry sieve treatment. The results showed that the agglomeration of aggregates was reduced by different intensity of fire, and the mechanical stability and water stability of soil were decreased, especially in severe and moderate fire. (3) The organic carbon content of dry sieve aggregates increased with the increase of grain size and decreased with the increase of soil depth. Compared with the control plots, the organic carbon content of 5 mm and 0.053 mm aggregates in 0-5 cm soil layers increased significantly (P 0.05), with an increase of 177.76% and 127.27%. The content of organic carbon in dry-sifted aggregates in moderate and light burning sites was similar to that in severe burning sites. The content of organic carbon in water-stable aggregates in 0-5 cm layers was increased by severe burning, while that in water-stable aggregates in moderate and light burning sites was increased by moderate and light burning. (4) The distribution of black carbon in dry-sieve agglomerates was similar to that of organic carbon. The black carbon content of 0-5 cm layer, 2-5 mm, 0.053-0.25 mm, 0.053 mm and < 0.053 mm dry-sieve agglomerates increased by 4.92, 4.19, 1.06, 0.44 g/kg, respectively, and the difference between the two groups was significant (P 0.05). The change of black carbon content of aggregates was similar to that of heavy burning. The heavy burning significantly increased the black carbon content of water-stable aggregates with different particle sizes in three soil layers (P 0.05), and the change of black carbon content of water-stable aggregates with moderate and light burning was small. (5) The BC/SOC ratio of all kinds of aggregates ranged from 0.05 to 0.45, and the different burning intensities significantly increased the dryness of all grades. (6) Correlation analysis showed that there was a significant linear relationship between organic carbon and black carbon in the whole soil and the content of organic carbon and black carbon in the dry-sieve aggregates with different sizes, while the linear correlation between organic carbon and black carbon in the water-stable aggregates was lower.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：S714.2
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