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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Quantification of trace gas emissions from shifting cultivation areas using remote sensing and ground-based measurements
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Quantification of trace gas emissions from shifting cultivation areas using remote sensing and ground-based measurements

机译：使用遥感和地面测量来量化转移种植区域中的痕量气体排放

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Shifting cultivation, also known as slash-and-burn cultivation, is widespread in the northeastern region of India and causes ecological loss to the forests and environment. It is locally called as 'jhum' and is practised by indigenous tribes during dry months of February to March every year. In India, 55% of the total forest cover is prone to fires annually1 and major contribution comes from shifting cultivation. Recurrent forest fires result in loss of forest cover, erosion of topsoil, desertification and decline in forest productivity2. Studies reveal that tropical biomass burning is a significant source of organic carbon to the atmosphere3'4, producing large amounts of trace gases and aerosol particles, which play a pivotal role in tro-posphericchemistry and climate5. Aerosols containing black carbon are emitted primarily in the tropical and subtropical regions of the world6, accounting for the release of almost 100 million tons of smoke aerosols into the atmosphere as a result of biomass burning7. These sub-micron smoke aerosols play a major role in radiation balance of the earth-atmospheric system8, by reflecting a portion of the incoming solar radiation back to space, thereby reducing the amount of sunlight reaching the earth's surface9'1 .In addition, aerosols from burning serve as cloud-condensation nuclei and alter the properties of the boundary-layer clouds11. Due to forest fires, there is widespread concern about the loss of biodiversity, spread of human and plant diseases through colonization, increase in concentration of greenhouse gases, changes on the earth's radiative energy budget, effects on atmospheric chemistry and increase in surface albedo and water run-off.
机译：轮作栽培，也称为刀耕火种，在印度东北地区很普遍，对森林和环境造成生态损失。它在当地被称为“ jhum”，每年2月至3月的干旱月份由土著部落实行。在印度，每年森林总覆盖面积的55％容易着火1，而主要的贡献来自轮作。反复发生的森林大火导致森林覆盖率下降，表土侵蚀，荒漠化和森林生产力下降2。研究表明，热带生物质燃烧是大气中有机碳的重要来源3'4，产生大量的痕量气体和气溶胶颗粒，这在对流层化学和气候中起着关键作用5。含有黑碳的气溶胶主要在世界的热带和亚热带地区排放6，这是由于生物质燃烧7而将近一亿吨烟雾气溶胶释放到大气中的原因7。这些亚微米烟雾气溶胶通过将一部分入射的太阳辐射反射回太空，从而减少了到达地球表面的阳光量9'1，从而在地球大气系统的辐射平衡中发挥了重要作用8。燃烧产生的气体起着云凝结核的作用，改变了边界层云的性质11。由于森林大火，人们普遍担心生物多样性的丧失，通过殖民地传播人类和植物疾病，温室气体浓度增加，地球辐射能预算的变化，对大气化学的影响以及地表反照率和水的增加径流。

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