共查询到18条相似文献，搜索用时 78 毫秒
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森林生物量与碳储量研究综述 总被引：1，自引：0，他引：1
在陆地生态系统中,森林生态系统是最大的碳库,其碳贮量约为1146PgC（PgC指1米深度的土壤有机碳总质量,1pg=109t）,占全球陆地总碳贮量的46%。1995年。2050年全球森林植被保存和吸收碳的潜力可达60～87PgC,可能吸收同期石化燃料排放碳的11％～15％,森林系统的碳收支状况对于大气二氧化碳的循环具有重要地位。 相似文献
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森林生态系统碳储量估测方法及其研究进展 总被引：13，自引：0，他引：13
森林生态系统作为陆地生态系统最大的碳库, 其碳交换对全球碳平衡有着重要影响, 研究其碳储量具有重要的科研和社会意义。文中阐述了森林生态系统碳储量研究进展及估测方法, 并展望了未来森林生态系统碳研究的主要方面。 相似文献
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碳循环研究是目前全球科学家关注的焦点之一,碳循环对全球气候变化的研究至关重要。目前森林生态系统碳循环研究,已成为全球碳循环的研究热点之一,根据国内外的研究资料,笔者分别从森林生态系统碳贮量、碳平衡及其研究方法等三方面对森林生态系统碳循环的研究进展进行综述。 相似文献
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粗木质残体(CWD)是森林生态系统重要的组成要素,由于定量研究某特定区域CWD的贮量和碳量的工作量相当大,需要长期的研究才能获得可信的数据,因此有关全球森林生态系统CWD的贮量和碳量仍不太清楚.本文根据国内外研究结果综述全球不同森林中CWD的贮量和碳库情况.结果表明:温带针叶林CWD贮量最高(30～200 t·hm-2),而阔叶林最低(8～50 t·hm-2);全球森林CWD碳贮量范围大致为75～114或157 Pg.各森林CWD贮量值变化大,因林龄、CWD分解阶段和人类经营活动(如疏伐、皆伐和控制火烧)而异.今后需更广泛地开展森林CWD调查,以更深刻理解CWD与林分结构、树种特性及干扰的关系.此外,为了更准确地评价CWD在森林生态系统中的生态价值,建议在更大尺度上对全球各类森林的CWD贮量和碳库进行长期的研究. 相似文献
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长白落叶松人工林带状间伐方式对土壤有机碳含量的影响 总被引：1，自引：0，他引：1
土壤是陆地生态系统碳循环过程中最大的有机碳库,其碳储存量高达1500Gt,为大气碳库的3倍,陆地生物量的2.5倍(Valentinietal.,2000)。土壤有机碳含量的微小变化,都会较大程度地影响陆地生态系统碳循环(陈亮中等,2007;于贵瑞,2003)。森林土壤碳储量占全球土壤碳储量的73%(崔骁勇等,2001),其积累和分解直接影响到全球的碳平衡(李德基等,1992)。因此,森林土壤有机碳储量变化备受关注,成为全球气候变化研究的核心内容之一(王绍强等,1999)。 相似文献
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灰木莲人工林碳贮量及其分配特征 总被引：1，自引：0，他引：1
对广西南宁市高峰林场46年生灰木莲人工林生态系统碳素贮量及其分配格局进行系统研究。结果表明,灰木莲各组分碳素含量变化范围为476.8~532.5 g/kg,各器官碳素含量为树干>树根>树枝>树皮>树叶,土壤层(0~80 cm)碳素含量为10.36 g/kg,不同土层碳素含量随土壤深度增加而降低。灰木莲人工林生态系统总碳贮量为236.70 t/hm2,其中乔木层碳贮量(118.03 t/hm2)最大,占生态系统总碳贮量的49.86%;灌木层碳贮量为2.00 t/hm2,占0.84%;草本层碳贮量为1.18 t/hm2,占0.50%;现存凋落物碳贮量为3.48 t/hm2,占1.47%;土壤层有机碳贮量为111.71 t/hm2,占47.19%。灰木莲人工林生态系统乔木层碳素年净固定量为3.72 t/(hm2·a),各组分碳素年净固定量大小依次为:树干>树叶>树根>树枝>树皮。 相似文献
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Greenhouse gases in the atmosphere, mainly carbon dioxide (CO2), can be mitigated by the planting of trees and shrubs. Appropriate agroforestry practices in Saskatchewan include field
and farmyard shelterbelts, wildlife plantations, poplar plantations and managed woodlots. A study was conducted to determine
the amount of carbon held in prairie shelterbelts. The effect of the soil type and tree species on biomass and carbon content
was measured in shelterbelts in the brown, dark brown and black soil zones of Saskatchewan. For some of the main shelterbelt
species, the mean aboveground carbon content was 79 kg/tree (32 t/km) for green ash, 263 kg/tree (105 t/km) for poplar, 144
kg/tree (41 t/km) for white spruce and 26 t/km for caragana. In the brown and the dark brown soils, which are more arid than
the black soil zone, trees had 60.6% and 65.5%, respectively, of the biomass and carbon content of trees and shrubs in the
black soil zone. Improved, fast-growing poplar clones had the greatest biomass at maturity and fixed the greatest amount of
carbon. Simple equations were developed to calculate the carbon contents of prairie shelterbelts, based on easily measured
tree or shrub parameters. This paper will discuss the results of this particular study and the broader implications of this
work.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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Carbon sequestration is important in studying global carbon cycle and budget. Here, we used the National Forest Resource Inventory data for China collected from 2004 to 2008 and forest biomass and soil carbon storage data obtained from direct field measurements to estimate carbon (C) sequestration rate and benefit keeping C out of the atmosphere in forest ecosystems and their spatial distributions. Between 2004 and 2008, forests sequestered on average 0.36 Pg C yr?1 (1 Pg = 1015g), with 0.30 Pg C yr?1 in vegetation and 0.06 Pg C yr?1 in 0–1 meter soil. Under the different forest categories, total C sequestration rate ranged from 0.02 in bamboo forest to 0.11 Pg C yr?1 in broadleaf forest. The southwest region had highest C sequestration rate, 30% of total C sequestration, followed by the northeast and south central regions. The C sequestration in the forest ecosystem could offset about 21% of the annual C emissions in China over the same period, especially in provinces of Tibet, Guangxi, and Yunnan, and the benefit was similar to most Annex I countries. These results show that forests play an important role in reducing the increase in atmospheric carbon dioxide in China, and forest C sequestration are closely related to forest area, tree species composition, and site conditions. 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