2000年至2016年间,厄瓜多尔的耕地扩张
José I Ochoa-Brito1,2, Aniruddha Ghosh1,3, Robert J Hijmans1
1Department of Environmental Science and Policy, University of California, Davis, Davis, California, United States of America.
PloS one
|September 19, 2023
概括
卫星数据显示,厄瓜多尔亚马逊和安第斯地区的耕地在2000-2016年间扩张,与政府统计数据形成鲜明对比. 这凸显了对不同数据源进行土地利用变化分析的重要性.
科学领域:
- 环境科学环境科学
- 遥感是一种远程传感.
- 生态生态学 生态生态学
背景情况:
- 由于持续的云层覆盖,厄瓜多尔在分析土地使用变化方面面临着挑战.
- 准确的耕地分布数据对于理解环境和经济转变至关重要.
研究的目的:
- 绘制和分析2000年至2016年间厄瓜多尔的耕地分布变化.
- 将卫星衍生的土地使用数据与政府统计数据进行比较.
主要方法:
- 开发了用于Landsat卫星图像的双阶段云过算法.
- 采用随机森林模型以高区域精度 (78-98%) 识别耕地.
主要成果:
- 耕地在帕拉莫,乔科热带雨林和西蒙塔内生物区域扩张最多.
- 卫星数据显示,安第斯山脉 (15%) 和亚马逊 (57%) 的耕地扩张,海岸地区的收缩率为4%.
- 政府数据显示了相反的趋势,安第斯山脉 (39%) 和亚马逊 (50%) 的农业收缩显著.
结论:
- 卫星数据有效地跟踪土地使用变化趋势,而政府数据可能在某些领域提供更准确的绝对值.
- 这些差异凸显了从多个来源交叉验证数据的必要性,以进行可靠的土地利用变化评估.
相关概念视频
00:57Population Growth
25.3K
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
25.3K
02:16Light Acquisition
8.5K
In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
8.5K
01:57Adaptations that Reduce Water Loss
25.7K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.7K
02:17Ecological Succession
17.3K
Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...
17.3K
01:46The Calvin Benson Cycle
4.6K
Ribulose 1,5- bisphosphate carboxylase/oxygenase (RuBisCo) is a critical enzyme that catalyzes carbon dioxide assimilation during photosynthesis. However, it is an inefficient enzyme, having an extremely slow catalytic rate. A typical enzyme can process about a thousand molecules per second; however, RuBisCo fixes only around three-carbon dioxides per second. Photosynthetic cells compensate for this slow rate by synthesizing very high amounts of RuBisCo, making it the most abundant single...
4.6K
02:22The Colonization of Land
34.4K
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
34.4K