長江流域典型地區(qū)土壤碳庫變化及固碳潛力研究
發(fā)布時間：2018-08-25 15:26
【摘要】：土壤碳庫是全球碳庫的重要組成部分,其微小幅度的碳源匯變化就可以較顯著的影響大氣碳庫。本文選擇長江流域多目標(biāo)區(qū)域地球化學(xué)調(diào)查覆蓋區(qū),利用多目標(biāo)區(qū)域地球化學(xué)調(diào)查數(shù)據(jù)和第二次全國土壤普查數(shù)據(jù)計算了土壤碳密度及儲量,對比了20年來土壤碳庫變化趨勢,分析土壤碳源匯的影響因素,并估算研究區(qū)農(nóng)田土壤固碳潛力。分析研究區(qū)土壤碳庫結(jié)構(gòu)表明,研究區(qū)土壤碳庫以有機碳為主,0~20cm、0~100cm和0~180cm深度對應(yīng)的土壤有機碳儲量(SOCS20、SOCS100和SOCS180)分別為1510.22Tg C、4975.20Tg C和7902.54Tg C。利用空間插值法對研究區(qū)土壤有機碳密度(SOCD)進(jìn)行空間分布分析表明,四川西部龍門山地區(qū)、貴陽周邊地區(qū)、湖南南部以及太湖周邊地區(qū)較高,四川東南部、重慶周邊以及江蘇東部沿海地區(qū)較低。在研究區(qū)各土壤類型中,SOCD相對較高的有暗棕壤、褐土、棕壤、山地草甸土、黃壤,而灘涂、濱海鹽土、紫色土、灌淤土相對較低;在各土地利用類型中表現(xiàn)為草地SOCD最高,其次是林地,灘涂最低。對比21世紀(jì)初和20世紀(jì)80年代土壤數(shù)據(jù)表明,研究區(qū)除了灘涂和沼澤地外,其他各土地利用類型有機碳密度總體上呈增加趨勢。從總量上看,林地和水田固碳量較大,分別為148.84Tg C和114.10Tg C,其次是草地,為22.96Tg C,統(tǒng)計得到研究區(qū)二十年間土壤有機碳庫累計形成土壤碳匯約312.38Tg C。研究區(qū)大部分區(qū)域SOCD明顯增加,尤其成都平原西部的龍門山地區(qū)、雅安南側(cè)地區(qū)、貴陽周邊地區(qū)增加非常明顯;而重慶-宜昌沿江地區(qū)、成都平原南部的內(nèi)江-成都-樂山地區(qū)、鎮(zhèn)江-高淳周邊地區(qū)呈減少趨勢。分析土壤理化性質(zhì)、土地利用變化、氣候變化以及土壤侵蝕作用對研究區(qū)土壤有機碳的影響。在各個影響因素中,導(dǎo)致研究區(qū)土壤碳庫增加的主要因素是,林地草地等植被恢復(fù)性生長、農(nóng)業(yè)耕作水平的提高,氣候的變化是導(dǎo)致研究區(qū)土壤碳源的重要原因,而土地利用變化對土壤碳庫影響較小,土壤侵蝕因素對研究區(qū)的水田基本沒有影響,但對旱地影響比較明顯。另外,其他因素導(dǎo)致研究區(qū)土壤碳庫增加181.07Tg C,具體原因有待進(jìn)一步分析。利用模型公式法計算研究區(qū)農(nóng)田土壤的固碳潛力(SOCDP)表明,研究區(qū)貴州省和湖南省北部區(qū)域大部分農(nóng)田土壤SOCDP較低,在環(huán)境條件不變的情況下,這片區(qū)域未來可能成為土壤碳源釋放碳;而湖北省和安徽省SOCDP普遍較高,土壤固碳潛力較大。從不同土壤類型的SOCDP看,黃壤、沼澤土和紫色土未來將成為碳源;而其他土壤類型未來將成為土壤碳匯。從固碳總量(SOCSP)來看,黃棕壤和水稻土SOCSP較大;而黃壤、沼澤土和紫色土的碳源作用明顯,應(yīng)在該土壤類型的農(nóng)田管理措施中采取保護(hù)性耕作或改變土地利用類型,減緩碳源作用。
[Abstract]:Soil carbon pool is an important part of global carbon pool, and the small change of carbon source and sink can significantly affect the atmospheric carbon pool. In this paper, the soil carbon density and reserves are calculated by using the multi-objective regional geochemical survey data and the data of the second national soil census, and the variation trend of soil carbon pool in the past 20 years is compared. The influencing factors of soil carbon sink were analyzed and the potential of carbon sequestration in farmland was estimated. The structure of soil carbon pool in the study area showed that the soil organic carbon storage (SOCS20,SOCS100 and SOCS180) corresponding to the depth of soil organic carbon (SOCS20,SOCS100) and the depth of 0~180cm (100cm) were 1510.22Tg C 4975.20Tg C and 7902.54Tg C, respectively. The spatial distribution of soil organic carbon density (SOCD) in the study area was analyzed by spatial interpolation method. The results showed that the Longmen Mountain area in the west of Sichuan, the surrounding area of Guiyang, the south of Hunan and the surrounding area of Taihu Lake were higher than those in the southeast of Sichuan. Chongqing and the eastern coastal areas of Jiangsu Province are lower. Dark brown soil, cinnamon soil, brown soil, mountain meadow soil, yellow soil, tidal flat, littoral saline soil, purple soil and irrigated silt were relatively high in each soil type of study area, and grassland SOCD was the highest in each land use type. Next is the woodland, the tidal flat is lowest. The comparison of soil data from the beginning of the 21st century and the 1980s shows that the organic carbon density of other land use types in the study area, except the tidal flat and marshland, is increasing in general. In terms of the total amount of carbon sequestration, the carbon sequestration in forestland and paddy field was relatively large (148.84Tg C and 114.10Tg C, respectively), followed by grassland (22.96Tg C). The soil organic carbon pool accumulated to form soil carbon sink (312.38Tg C) in the study area during 20 years. The SOCD increased significantly in most regions of the study area, especially in the Longmen Mountain region in the west of Chengdu Plain, the south side of Ya'an and the surrounding area of Guiyang, while the Chongqing-Yichang area along the Yangtze River, The Neijiang-Chengdu-Leshan area in the south of Chengdu Plain, Zhenjiang-Gaochun area shows a decreasing trend. The effects of soil physical and chemical properties, land use change, climate change and soil erosion on soil organic carbon were analyzed. Among the influencing factors, the main factors that lead to the increase of soil carbon pool in the study area are the restoration growth of vegetation such as woodland and grassland, the improvement of agricultural cultivation level, and the change of climate are the important reasons leading to the soil carbon source in the study area. However, land use change had little effect on soil carbon pool, soil erosion had no effect on paddy field, but it had obvious effect on dryland. In addition, other factors lead to the increase of 181.07Tg C in soil carbon pool in the study area, the specific reasons need to be further analyzed. The carbon sequestration potential (SOCDP) of farmland soils in the study area was calculated by using the model formula method. The results show that the SOCDP of most farmland soils in Guizhou Province and northern Hunan Province is low, and the environmental conditions are not changed. This region is likely to be a carbon source in the future, while the SOCDP is generally high in Hubei and Anhui provinces, and the potential of carbon sequestration in soils is great. According to the SOCDP of different soil types, yellow soil, swamp soil and purple soil will become carbon sources in the future, while other soil types will become soil carbon sinks in the future. In terms of total carbon sequestration (SOCSP), the SOCSP of yellow brown soil and paddy soil was larger, while the carbon source of yellow soil, swamp soil and purple soil was obvious, so conservation tillage or land use type should be adopted in farmland management measures of this soil type. To slow down the action of carbon source.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S153.6
本文編號：2203313
[Abstract]:Soil carbon pool is an important part of global carbon pool, and the small change of carbon source and sink can significantly affect the atmospheric carbon pool. In this paper, the soil carbon density and reserves are calculated by using the multi-objective regional geochemical survey data and the data of the second national soil census, and the variation trend of soil carbon pool in the past 20 years is compared. The influencing factors of soil carbon sink were analyzed and the potential of carbon sequestration in farmland was estimated. The structure of soil carbon pool in the study area showed that the soil organic carbon storage (SOCS20,SOCS100 and SOCS180) corresponding to the depth of soil organic carbon (SOCS20,SOCS100) and the depth of 0~180cm (100cm) were 1510.22Tg C 4975.20Tg C and 7902.54Tg C, respectively. The spatial distribution of soil organic carbon density (SOCD) in the study area was analyzed by spatial interpolation method. The results showed that the Longmen Mountain area in the west of Sichuan, the surrounding area of Guiyang, the south of Hunan and the surrounding area of Taihu Lake were higher than those in the southeast of Sichuan. Chongqing and the eastern coastal areas of Jiangsu Province are lower. Dark brown soil, cinnamon soil, brown soil, mountain meadow soil, yellow soil, tidal flat, littoral saline soil, purple soil and irrigated silt were relatively high in each soil type of study area, and grassland SOCD was the highest in each land use type. Next is the woodland, the tidal flat is lowest. The comparison of soil data from the beginning of the 21st century and the 1980s shows that the organic carbon density of other land use types in the study area, except the tidal flat and marshland, is increasing in general. In terms of the total amount of carbon sequestration, the carbon sequestration in forestland and paddy field was relatively large (148.84Tg C and 114.10Tg C, respectively), followed by grassland (22.96Tg C). The soil organic carbon pool accumulated to form soil carbon sink (312.38Tg C) in the study area during 20 years. The SOCD increased significantly in most regions of the study area, especially in the Longmen Mountain region in the west of Chengdu Plain, the south side of Ya'an and the surrounding area of Guiyang, while the Chongqing-Yichang area along the Yangtze River, The Neijiang-Chengdu-Leshan area in the south of Chengdu Plain, Zhenjiang-Gaochun area shows a decreasing trend. The effects of soil physical and chemical properties, land use change, climate change and soil erosion on soil organic carbon were analyzed. Among the influencing factors, the main factors that lead to the increase of soil carbon pool in the study area are the restoration growth of vegetation such as woodland and grassland, the improvement of agricultural cultivation level, and the change of climate are the important reasons leading to the soil carbon source in the study area. However, land use change had little effect on soil carbon pool, soil erosion had no effect on paddy field, but it had obvious effect on dryland. In addition, other factors lead to the increase of 181.07Tg C in soil carbon pool in the study area, the specific reasons need to be further analyzed. The carbon sequestration potential (SOCDP) of farmland soils in the study area was calculated by using the model formula method. The results show that the SOCDP of most farmland soils in Guizhou Province and northern Hunan Province is low, and the environmental conditions are not changed. This region is likely to be a carbon source in the future, while the SOCDP is generally high in Hubei and Anhui provinces, and the potential of carbon sequestration in soils is great. According to the SOCDP of different soil types, yellow soil, swamp soil and purple soil will become carbon sources in the future, while other soil types will become soil carbon sinks in the future. In terms of total carbon sequestration (SOCSP), the SOCSP of yellow brown soil and paddy soil was larger, while the carbon source of yellow soil, swamp soil and purple soil was obvious, so conservation tillage or land use type should be adopted in farmland management measures of this soil type. To slow down the action of carbon source.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S153.6
【參考文獻(xiàn)】
相關(guān)期刊論文 前9條
1 許月卿;邵曉梅;;基于GIS和RUSLE的土壤侵蝕量計算——以貴州省貓?zhí)恿饔驗槔齕J];北京林業(yè)大學(xué)學(xué)報;2006年04期
2 許信旺;潘根興;曹志紅;汪艷林;;安徽省土壤有機碳空間差異及影響因素[J];地理研究;2007年06期
3 奚小環(huán);楊忠芳;夏學(xué)齊;李敏;;基于多目標(biāo)區(qū)域地球化學(xué)調(diào)查的中國土壤碳儲量計算方法研究[J];地學(xué)前緣;2009年01期
4 許乃政;劉紅櫻;魏峰;;土壤碳庫及其變化研究進(jìn)展[J];江蘇農(nóng)業(yè)科學(xué);2011年02期
5 韓冰,王效科,歐陽志云;中國農(nóng)田生態(tài)系統(tǒng)土壤碳庫的飽和水平及其固碳潛力[J];農(nóng)村生態(tài)環(huán)境;2005年04期
6 邵月紅;潘劍君;許信旺;米高奇;;淺談土壤有機碳密度及儲量的估算方法[J];土壤通報;2006年05期
7 黃東邁,朱培立,王志明,余曉鶴;旱地和水田有機碳分解速率的探討與質(zhì)疑[J];土壤學(xué)報;1998年04期
8 高魯鵬,梁文舉,姜勇,聞大中;利用CENTURY模型研究東北黑土有機碳的動態(tài)變化Ⅰ.自然狀態(tài)下土壤有機碳的積累[J];應(yīng)用生態(tài)學(xué)報;2004年05期
9 于東升;史學(xué)正;孫維俠;王洪杰;劉慶花;趙永存;;基于1∶100萬土壤數(shù)據(jù)庫的中國土壤有機碳密度及儲量研究[J];應(yīng)用生態(tài)學(xué)報;2005年12期
相關(guān)博士學(xué)位論文 前1條
1 李娜;凍融作用對吉林西部典型土壤碳氮酶的影響機制及溫室氣體排放研究[D];吉林大學(xué);2012年
，本文編號：2203313
本文鏈接：http://sikaile.net/kejilunwen/nykj/2203313.html
最近更新
教材專著
