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Based on field investigation and indoor analysis, distribution characteristics of four available trace elements, including Cu, Fe, Mn, Zn, in the terrace land in loess region, was studied. Results indicated that, these four available trace elements distributed unevenly across soil profile, and its variation coefficient was high, which reached medium and high level. Distribution trends of these four...
In order to investigate the fruit quality of tomato (Lycopersicon esculentum mill) affected by microenvironment and soil water and fertilizer, the field experiment was conducted in a greenhouse in Ansia research Station of Soil and Water Conservation, Chinese Academy of Science, Yan'an, Shaanxi province, China, from March to October in 2008 and 2009. The research results showed that soluble protein...
Based on the analysis of the bioenergy crop production function of land use, combined with the current situation of Chinese land use, this paper analyzes and discusses the cultivation of energy plants and the bioenergy crop production function of land use. Results show that there is a lot of unused land and marginal land to plant bioenergy crops to perform the bioenergy crop production function of...
Land surface temperature (LST) is an important quantity parameter for agricultural crop environmental models , in this article, NOAA AVHRR thermal infrared images data of 10 days were used for surface temperature retrieval by using the split window techniques (SWT). Nine kinds of split window algorithms were used to retrieve surface temperature of Handan in North Plain of China during the growing...
Solar radiation data is essential to the work of energy planners, engineers and agricultural scientist. In this study, the solar radiation model was developed using the measurements from the 101 solar radiation observation stations in China. The average daily radiation on horizontal surfaces in 621 meteorological stations was estimated by the model with the sunshine hours and geographic information...
This research is innovative in such aspects as research content, method and so on. Authors took Northeast China as study area, with the help from "3S" technology and based on spatial and temporal land resource data, agricultural statistics data and considering the natural and socio-economic factors. And, this paper analyzed the impact of cultivated land change on the grain production capacity...
The Hexi Corridor district of Gansu is one of the best barley bases in China. The quality of barley malt plays an important role on its price. Therefore, the key development factor of the barley malt plant relies on promoting drying process technology and drying malt quality. In this paper, Ganpi No. 4 is selected as the drying raw material, because it is the main strain of barley planted in the Hexi...
Located in the central area of Dali in Yunnan Province, the Erhai Lake Basin is an important agricultural industry base in China with its unique geographical and climate conditions, etc. However, the agricultural structure and land-use patterns in the basin have had some impact on the water environment in Erhai Lake Basin, and soil and water loss and the agricultural area pollution are important factors...
The objective of this research is to develop algorithm to recognize black germ wheat based on image processing. The sample used for this study involved wheat from major producing areas of China. Images of wheat were acquired with a color linear CCD machine vision system. Each image was pre-processed to correct color offset. Then double threshold method was used to segment black germ from background...
The objective of this research is to develop algorithm to recognize black germ wheat based on image processing. The sample used for this study involved wheat from major producing areas of China. Images of wheat were acquired with a color linear CCD machine vision system. Each image was pre-processed to correct color offset. Then double-threshold method was used to segment black germ from background...
This study was aimed to assess the levels of selected heavy metals and herbicides in soils under different land usage and plant products from an agricultural area of Tieling district, Liaoning Province, China. Cd, Pb, atrazine, acetochlor and butachlor were analyzed from maize, paddy and vegetable field. Cd concentrations in 40% of vegetable soils and 6.67% of rice soils were higher than "Environmental...
This paper presented a machine vision system with a color linear CCD to identify several China wheat classes. However, these images were deformed due to color linear CCD itself, image noise and uneven brightness also existed. The image needs to be corrected so as to segment the wheat features better. Algorithms of linearity equation were developed to correct geometric distortions, homomorphic filtering...
Huang-Huai-Hai region is one of the main grain production regions, thus it is helpful to assess land productivity in this region for informing land users about their land quality and supporting policy and decision-making. In this paper, the land quality was monitored by crop yield estimation. Based on estimating crop biomass and harvest index with remote sensing, the crop yield of Huang-Huai-Hai region...
Taking the crop lands around Xinjing village in the upstream reaches of the Bi River as study area, this paper measured the contents of four heavy metals (Pb, Zn, Cd and As), evaluated the pollution degree using the pollution index and interpolated their spatial distribution by Kriging method in ArcGIS. The results indicated: (1) only the content of Cd exceeded background levels of soils, which was...
This paper presents regional trends in vegetation greenness in Inner Mongolia Autonomous Region, semiarid areas of China. We used NOAA GIMMS NDVI data from 1982 to 2006 to explore the relationship between vegetation greenness change and climatic and anthropogenic factors based on the analyses of meteorological data, high spatial resolution remotely sensed data and local economic statistical data....
Information on the crop types is necessary for the studies on global food security and other environmental problems. Fields of crop types are distinguished by images for special periods of planting, growing and harvesting from other LULC types. Series of Landsat satellites can provide high quality images during those special periods. With the local knowledge of crop calendar, we calculated Normalized...
Some problems are emerged in crop residues (CRs) utilization in China today. Based on management theory, it is regarded that shorting management thoughts and methods contribute to the failure of the projects of utilizing CRs, which both wasted the money and counteracted the utilization of CRs. The relationship cycle model is given to clear the relationship among the government, the institution, the...
The paper utilizes data envelopment analysis (DEA) and a newly proposed total-factor cultivated land efficiency (TFCLE) index to analyze cultivated land use efficiencies of 31 cantons in China from 1999 through 2008. The results indicate that the national TFCLE is 0.649, which shows 35.1 percent of improvement. In terms of geographical distribution, the uppermost category including Beijing, Hainan,...
In plants, chlorophyll content (CC) is an important indicator of photosynthetic activity, stress, and nutritional status. In this study, hyperspectral indices were used to create a neural network model to detect subtle variations in leaf chlorophyll content of rice under heavy metal stress. We selected four experiment rice farmlands with different levels of heavy metal contamination. The four sites...
This paper presents a method for automatically identifying crop planting areas at a large-scale based on time-series of MODIS NDVI Datasets in China Agriculture Remote Sensing Monitoring System(CHARMS). This method was applied to extracting planting areas of major crops in China, including spring wheat, winter wheat, spring maize, summer maize, cotton, soybean and paddy. More than 50 models were built...
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