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利用旌德县第8次森林资源二类调查数据,采取建立数学模型的方法分析了该县的乔木林总量及其年龄结构,依据建立的不同森林类型生物量和蓄积量之间的回归方程,估算了全县乔木林的碳储量及碳密度。结果表明:(1)旌德县乔木林总面积50190.7 hm2,乔木林总蓄积3624337 m3,以庙首镇森林面积最大。(2)乔木树种以杉类、硬阔和松类的面积和蓄积最大,乔木林的年龄结构较为合理;(3)乔木林生物量为118.18万t,乔木林碳储量为591485.20 t,碳密度为11.78 t/hm2,不同森林类型碳密度差异很大,以柏类的碳密度最大,达到27.63 t/hm2,软阔、硬阔林的碳密度较小,仅为0.73 t/hm2.和0.17 t/hm2.。因此,在实施各重点造林工程的同时加强中幼林抚育管理,提升现有林质量,促进林木生长,有效增加单位面积蓄积量,将会使旌德县森林的碳汇能力进一步提高。 相似文献
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利用旌德县第8次森林资源二类调查数据,采取建立数学模型的方法分析了该县的乔木林总量及其年龄结构,依据建立的不同森林类型生物量和蓄积量之间的回归方程,估算了全县乔木林的碳储量及碳密度。结果表明:(1)旌德县乔木林总面积50 190.7hm2,乔木林总蓄积3 624337m3,以庙首镇森林面积最大。(2)乔木树种以杉类、硬阔和松类的面积和蓄积最大,乔木林的年龄结构较为合理;(3)乔木林生物量为118.18万t,乔木林碳储量为591485.20 t,碳密度为11.78 t/hm2,不同森林类型碳密度差异很大,以柏类的碳密度最大,达到27.63 t/hm2,软阔、硬阔林的碳密度较小,仅为0.73 t/hm2.和0.17t/hm2.。因此,在实施各重点造林工程的同时加强中幼林抚育管理,提升现有林质量,促进林木生长,有效增加单位面积蓄积量,将会使旌德县森林的碳汇能力进一步提高。 相似文献
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森林通过吸收大气中的二氧化碳固定到碳库中,在“双碳”目标中起着碳中和的重要作用。本研究基于大冶市2019年林业资源二类调查小班数据,采用材积源生物量法对大冶市森林资源的植被碳储量和碳密度进行测算,结果表明:大冶市现有森林植被碳储量114.36×104 t,平均植被碳密度为23.66 t·hm-2;碳储量较高的区域主要集中分布在大冶南部山区,灌木林碳储量占比最高,其次为马尾松林;马尾松林的平均植被碳密度最高,达到35.64 t·hm-2。该测算结果可为大冶市实现“双碳”目标以及森林资源的科学管理提供数据基础和决策依据。 相似文献
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根据湖南省森林资源二类调查数据,运用生物量清单法和平均生物量法,对湖南省森林植被碳储量分乔木林碳库、竹林碳库、经济林碳库和灌木林碳库4大碳库分别进行估算并分析其空间格局的差异与特征。结果表明:湖南省2016年森林植被碳储量为253.359 TgC,平均碳密度为24.266 t/hm~2。全省14个市州中,怀化市的森林植被碳储量最大,为36.863 TgC,其次是邵阳市、永州市和郴州市,常德市的森林植被碳密度最高,为40.584 t/hm~2;不同森林植被类型中,阔叶树碳储量最大,三杉碳密度最高。 相似文献
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云南省森林生态系统植被碳储量及碳密度估算 总被引:1,自引:0,他引:1
《西部林业科学》2015,(5)
基于2009-2013年第8次全国森林资源连续清查数据,利用生物量扩展因子法,采用改良的计算参数,从不同龄组、林型等方面进行考虑,对云南省森林资源的生物量、碳储量及碳密度进行了估算。结果表明,我国第8次森林资源清查中,云南省森林林分生物量为1 640.92×106t,平均生物量为101.71 t/hm2,林分碳储量为775.30×106t C,林分平均碳密度为50.77 t C/hm2,森林植被碳储量总量为818.29×106t C。人工林碳储量只占林分碳储量的5.90%,幼龄林只占林分碳储量的17.09%;天然林与成熟林在云南省森林资源碳储量中所占比重较大,在扩大云南省森林植被碳储量方面,可以通过选择林龄结构及森林林分类型来加以实现。人工林将会在森林植被碳储量中占有越来越重要的地位。 相似文献
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在2011—2012年江苏省样地野外调查的基础上,结合江苏省2010年森林资源二类调查的结果,计算出江苏省森林生态系统的碳储量和碳密度。结果表明:截止到2012年,江苏省森林生态系统总碳储量为179.16Tg C。其中乔木层、灌草层、凋落物层和土壤层的碳储量分别为57.95,6.90,14.44,99.87Tg C,占总碳量的32.44%,3.85%,8.05%,55.66%。江苏省森林生态系统的平均碳密度为143.00T/hm2。各层的碳密度大小为:土壤层(83.65 T/hm2)乔木层(51.43T/hm2)凋落物层(5.24T/hm2)灌草层(2.66T/hm2)。林分类型不同,其碳储量和碳密度存在很大差异,其中落叶阔叶林碳储量最大为102.03Tg C,竹林碳储量最小为3.90Tg C;常绿阔叶林碳密度最大为170.97 T/hm2,落叶阔叶林碳密度最小:109.99 T/hm2。从龄组看,全省森林碳储量主要集中10a以下林、10~20a林,分别为11.36,27.92Tg C,两者占全省总碳储量25.07%,61.63%。植被地上生物量与土壤特性相关分析表明:土壤碳含量、氮含量与植被地上生物量均呈正相关,其中氮含量与地上生物量有较显著的正相关关系(p=0.03),各土层含水量与地上生物量的相关性不明显。 相似文献
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未来中国森林碳蓄积预估初步研究 总被引:2,自引:0,他引:2
根据我国林业部分的规划,在持续、有序绿化的前提下,从2005~2044年,中国森林从大气中净吸收的C可达到51.74×108~125.30×108t,约占同期我国CO2排放总量的27.1%~65.6%。年吸收量呈逐年递增态势,2025~2044年间的年平均吸收量可达1.91×108t。在实现国土绿化的过程中,我国森林资源将强烈抑制大气CO2的升高,具有极其可观的生态效益、环境效益。我国森林资源CO2同化能力和碳蓄积量的双双提高,将为我国的经济发展预留更广阔的CO2排放空间,对我国参与国际间环境以碳排放的谈判具有实质性意义。 相似文献
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火干扰对森林碳库影响的量化研究进展 总被引:1,自引:0,他引:1
火干扰是森林生态系统的主要干扰因子之一, 会对森林碳储量和碳动态产生重要影响。准确量化火干扰对森林中各碳库的影响程度, 对国家及全球碳预算具有重要意义。文中对国内外火干扰下森林碳储量的研究现状、研究方法和研究内容进行了综述。大量研究表明, 燃烧效率、火烧烈度等关键因子的准确量化是精确估算火干扰对森林碳储量影响的基础, 火烧样地调查与遥感反演法和模型模拟法的综合运用有利于精确量化火干扰下的森林碳库, 各种火烧数据源的同化处理是准确揭示火干扰对森林碳库影响的重要保证。在此基础上, 提出一些更加准确量化火干扰对森林碳储量影响的研究途径, 并对未来的研究方向进行了展望。 相似文献
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四川省退耕还林碳汇潜力预测研究 总被引:3,自引:0,他引:3
通过调研四川省退耕还林工程实施现状,建立模型,预测未来60 a 四川省退耕还林工程的碳汇潜力。采用经由森林清查人工林历史生长数据拟合的里查德方程(Richards equation)进行分树种生长量预测,依据文献调研所得有关参数计算相应的生物碳储量,结合碳排放、碳基线和碳泄漏的分析与估算,得出四川省退耕还林工程未来60 a碳汇量。 相似文献
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Profiles of carbon stocks in forest, reforestation and agricultural land, Northern Thailand 总被引:1,自引:0,他引:1
A study was conducted to assess carbon stocks in various forms and land-use types and reliably estimate the impact of land use on C stocks in the Nam Yao sub-watershed (19°05'10"N, 100°37'02"E), Thailand. The carbon stocks of aboveground, soil organic and fine root within primary forest, reforestation and agricultural land were estimated through field data collection. Results revealed that the amount of total carbon stock of forests (357.62 ± 28.51 Mg·ha-1, simplified expression of Mg (carbon)·ha-1) was significantly greater (P< 0.05) than the reforestation (195.25 ±14.38 Mg·ha-1) and the agricultural land (103.10±18.24 Mg·ha-1). Soil organic carbon in the forests (196.24 ±22.81 Mg·ha-1) was also significantly greater (P< 0.05) than the reforestation (146.83± 7.22 Mg·ha-1) and the agricultural land (95.09 ± 14.18 Mg·ha-1). The differences in carbon stocks across land-use types are the primary consequence of variations in the vegetation biomass and the soil organic matter. Fine root carbon was a small fraction of carbon stocks in all land-use types. Most of the soil organic carbon and fine root carbon content was found in the upper 40-cm layer and decreased with soil depth. The aboveground carbon(soil organic carbon: fine root carbon ratios (ABGC: SOC: FRC), was 5:8:1, 2:8:1, and 3:50:1 for the forest, reforestation and agricultural land, respectively. These results indicate that a relatively large proportion of the C loss is due to forest conversion to agricultural land. However, the C can be effectively recaptured through reforestation where high levels of C are stored in biomass as carbon sinks, facilitating carbon dioxide mitigation. 相似文献
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This work quantified the total carbon and 12 other sediment characteristics at 10 soil depths, in planted and or natural mangrove forests in comparison with non-vegetated soil for four seasons of the year 2009-2010 in the Vellar-Coleroon estuarine complex, India. The sedi- ment characteristics varied significantly between mangrove-vegetated and non-vegetated habitats or seasons of analysis, but not between soil depths. The mangrove sediments were rich in total carbon and total or- ganic carbon as compared to non-mangrove sediments (p 〈0.01). Total carbon was 98.2% higher in mature mangroves and 41.8% in planted mangroves than that in non-mangrove soil. Total organic carbon was as much as 2.5 times greater in mature mangroves and 2 times greater in planted mangroves than that in unvegetated soil. Carbon contents also varied many fold by season. Total carbon content was 8.6 times greater during pre-monsoon, 4.1 times greater during post-monsoon and 2.5 times greater during monsoon than during summer (P〈0.01 in all cases). Similarly, total organic carbon was 5.9 times greater during pre-monsoon, 3.1 times greater during post-monsoon and 69% greater during monsoon than during summer. In general, higher levels of sediment carbon were recorded during pre and post-monsoon seasons than during other seasons. Total carbon concentration was correlated negatively to temperature, sand and phosphorus (P 〈0.01); positively correlated with redox potential, silt, clay, C/N ratio, potassium (P 〈0.01) and nitrogen (P〈0.05); but not correlated with soil depth, pH or salinity. This work revealed that the carbon burial was rapid at the annual rate of 2.8% for total carbon, and 6.7% for total organic carbon in mangrove-planted sediment. Cleating of mangroves can result in significantly and rapidly reduced carbon stores.Our study highlights the importance of natural and plantation mangrove stands for conserving sediment carbon in the tropical coastal domain. 相似文献