搜索结果: 1-15 共查到“农学 semi-arid”相关记录46条 . 查询时间(0.109 秒)
Revealing the Structure and Composition of the Restored Vegetation Cover in Semi-Arid Mine Dumps Based on LiDAR and Hyperspectral Images
ecological restoration hierarchical classification vegetation structure LiDAR vegetation species
2023/12/1
Remotely sensed images with low resolution can be effectively used for the large-area monitoring of vegetation restoration, but are unsuitable for accurate small-area monitoring. This limits researche...
北京大学城市与环境学院刘鸿雁教授课题组在Communications Biology期刊上发表题为“Drought-modulated allometric patterns of trees in semi-arid forests”的论文（图）
刘鸿雁 教授 半干旱区森林 树木生长
2020/8/20
北京大学城市与环境学院刘鸿雁教授课题组7月30日在Communications Biology期刊上发表题为“Drought-modulated allometric patterns of trees in semi-arid forests”的论文。课题组与中科院植物所、英国埃克塞特大学、德国马普生物地球化学研究所同行合作，借助地基激光雷达，系统地研究了我国北方地区广泛分布的蒙古栎（Querc...
INVESTIGATION OF THE POSSIBILITY OF FOREST TYPE MAPPING IN ARID AND SEMI-ARID REGIONS USING LANDSAT ETM+ DATA
Forest Classification Accuracy Landsat Fusion Quality Soil Vegetation
2015/7/29
Landsat ETM+ data from the National Park of Khabr in Kerman province, dating May 2000, were analyzed to investigate the
possibility of forest type mapping in arid and semi-arid regions.Quality evalu...
RELATIONSHIPS BETWEEN PRIMARY PRODUCTION AND CROP YIELDS IN SEMI-ARID AND ARID IRRIGATED AGRO-ECOSYSTEMS
Agriculture Crop GIS Analysis
2015/5/6
In semi-arid areas within the MENA region, food security problems are the main problematic imposed. Remote sensing can be a promising too early diagnose food shortages and further prevent the popula...
Storm-wise sediment yield prediction using hillslope erosion model in semi-arid abundant lands
abundant lands erosion model hillslope erosion model (HEM) Iran Khosbijan Research Centre
2015/3/9
Evaluation of soil erosion by existing models is needed as an important tool for managerial purposes in designation of proper water and soil conservation techniques. The present study aimed to assess ...
Evidence that acidifi cation-induced declines in plant diversity and productivity are mediated by changes in below-ground communities and soil properties in a semi-arid steppe
base mineral cations nitrogen cycling plant species richness plant–soil (belowground) interactions productivity semi-arid steppe soil aluminium ions soil microbial organisms soil nematodes structural equation modelling
2015/2/4
Anthropogenic acid deposition–induced soil acidification is one of the major threats to biodiversity, ecosystem functioning and services. Few studies, however, have explored in detail how above-ground...
Short-t erm responses of a Stipa grandis/Leymus chinensis community to frequent defoliation in the semi-arid grasslands of Inner Mongolia, China
Grassland degradation Semi-arid Inner Mongolia Defoliation Productivity
2015/2/4
Grassland degradation due to over-grazing causes severe ecological and economical problems in the semi-arid grasslands of Inner Mongolia, PR China. The development of sustainable management systems is...
Changes in carbon and nitrogen of Chernozem soil along a cultivation chronosequence in a semi-arid grassland
Changes in carbon nitrogen of Chernozem soil cultivation chronosequence semi-arid grassland
2015/2/4
Changes in the carbon (C) stock of grassland soil in response to land use change will increase atmospheric CO2, and consequently affect the climate. In this study we investigated the effects of land u...
Nutritive Value of Grasses in Semi-arid Rangelands of Ethiopia: Local Experience Based Herbage Preference Evaluation versus Laboratory Analysis
Semi-arid Rangelands Spatial Variation in Feed Quality
2016/5/11
We examined the nutritive value of common grass species in the semi-arid rangelands of Borana in southern Ethiopia using local experience based herbage preference (LEBHP) perception and laboratory tec...
Evaluation of pan coefficient equations in a semi-arid Mediterranean environment using the ASCE-standardized Penman-Monteith method
Pan Evaporation Reference Evapotranspiration ASCE-Standardized Penman-Monteith
2013/2/27
Reference crop evapotranspiration (ETo) is essential for irrigation, water resources management and environmental assessment. The indirect estimation of ETo is based a) on energy budget approach using...
Long-term effects of management systems on crop yield and soil physical properties of semi-arid tropics of Vertisols
Broadbed and Furrow System Minimum Tillage Long-Term Experiment Sustainability
2013/3/5
Long-term experiments can be used to assess management induced changes in soil properties and sustainability of the management system in terms of the productivity. Such data are scanty, especially in ...
Measuring and simulating maize (Zea mays L.) yield responses to reduced tillage and mulching under semi-arid conditions
Nitrogen-Modelling-Planting Basins-Semi Arid-Variable Rainfall-Zimbabwe
2013/3/4
Rainfed smallholder agriculture in semi-arid environments of sub-Saharan Africa faces many challenges. Productivity of the smallholder agricultural systems has been on the decline in recent years. Con...
Water use efficiency and yield of winter wheat under different irrigation regimes in a semi-arid region
Water Use Efficency Yield Surface and Drip Irrigation
2013/3/4
In irrigation schemes under rotational water supply in semiarid region, the water allocation and irrigation scheduling are often based on a fixed-area proportionate water depth with every irrigation c...
Using precipitation effectiveness variables in indexing drought in semi-arid regions
Drought indexing precipitation effectiveness variables semi arid regions
2011/1/12
This study proposes a new drought index based on several precipitation-based parameters to quantify drought hazard in semi arid region. In addition to the practice of using only rainfall volume for in...
A Developed GIS-based Land Evaluation Model for Agricultural Land Suitability Assessments in Arid and Semi Arid Regions
Agricultural land suitability GIS modeling ALESarid-GIS Yield prediction Nile Delta
2010/11/16
In the study an attempt is made at deciding the best agricultural land use in a study area
located in the western part of the Nile Delta in Egypt. The area covers approximately 14,194 hectares and co...