نتایج جستجو برای: forest ground
تعداد نتایج: 243888 فیلتر نتایج به سال:
Forests and their associated habitats are an integral part of Earth’s biosphere and provide essential environmental services. There is an ever present need for accurate and economic monitoring of forest parameters such as biomass of great interest both locally, for forest management and resource utilization, and globally as it represents stored atmospheric CO2 and one of the largest uncertainti...
Estimates of forest canopy cover are widely used in forest research and management, yet methods used to quantify canopy cover and the estimates they provide vary greatly. Four commonly used ground-based techniques for estimating overstory cover – line-intercept, spherical densiometer, moosehorn, and hemispherical photography – and cover estimates generated from crown radii parameters of the wes...
The orangutan is the world's largest arboreal mammal, and images of the red ape moving through the tropical forest canopy symbolise its typical arboreal behaviour. Records of terrestrial behaviour are scarce and often associated with habitat disturbance. We conducted a large-scale species-level analysis of ground-based camera-trapping data to evaluate the extent to which Bornean orangutans Pong...
INTRODUCTION Everyone knows that forest is the source of water for all people who live on Thai soil. We do not have any other source of water in Thailand ... [the forest] provides for underground water storage, making the ground moist as a benefit for all people... The result of cutting forest is the destruction of the water source of the Thai people. (Royal Forest Department/Suan Pa Sirikit, 1...
Pao-Shen Huang, Hui-Chen Lin, I-Min Tso, and Chung-Ping Lin (2011) Effects of thinning on spider diversity in an East Asian subtropical plantation forest. Zoological Studies 50(6): 705-717. Studies examining the effects of forest management on biodiversity in Asia are scarce and conducted mostly in temperate areas. In this study, the effects of the management on the biodiversity of a subtropica...
The availability of multi-temporal ERS one-day coherence images and extensive in situ data from test sites located in Sweden, Finland and Siberia has allowed a first assessment on the consistency of stem volume retrieval at stand level within the boreal zone. The test sites are characterised by different forest structure and ground properties. The coherence data had baselines up to 374 m. The r...
Modeling sub-canopy elevation is an important step in the processing of waveform lidar data to measure three dimensional forest structure. Here, we present a methodology based on high resolution discrete-return lidar (DRL) to correct the ground elevation derived from large-footprint Laser Vegetation Imaging Sensor (LVIS) and to improve measurement of forest structure. We use data acquired over ...
Radar sensors have the potential to retrieve vertical forest structure measurements thanks to their capability to penetrate into the foliage. However, studies are needed in order to understand better the interaction of radar beams with the canopy. The most commonly used radar technique for estimating forest parameters operates from spacecraft at different wavelength (X-, C-, and L-band). In ord...
Forest topsoil supports vegetation growth and contains the majority of soil nutrients that are important indices of soil fertility and quality. Therefore, estimating forest topsoil properties, such as soil organic matter (SOM), total nitrogen (Total N), pH, litter-organic (O-A) horizon depth (Depth) and available phosphorous (AvaP), is of particular importance for forest development and managem...
A central parameter to the terrestrial carbon budget is forest biomass which represents a proxy for carbon. Despite its crucial role in the terrestrial carbon budget, forest biomass is poorly quantified across most parts of the planet due to the great difficulties in measuring biomass on the ground and consistently aggregating measurements across scales. Today’s information is largely based on ...
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