Research Institute of Forest Resource Information Techniques

China

Research Institute of Forest Resource Information Techniques

China

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Ma Z.,Research Institute of Forest Resource Information Techniques | Ma Z.,Research Institute of Forest Ecology Environment and Protection | Huang Q.,Research Institute of Forest Resource Information Techniques | Zhuang C.,Research Institute of Forest Resource Information Techniques | Wang H.,Research Institute of Forest Resource Information Techniques
Linye Kexue/Scientia Silvae Sinicae | Year: 2016

Objective: In this paper, the quantity characteristics of two typical epiphytic ferns, Neottopteris nidus and Pseudodrynaria coronans,were investigated to provide basic information for evaluating the characteristics of the two ferns and monitoring the biodiversity located in canopy. Method: The primary forests (PFs) and degraded primary forests (DPFs) were analyzed respectively using data from 16 plots, at which all the two nest ferns can be present. The two types of communities were compared of their elevation of distribution, size and density, and density of hosts, number of nest ferns on individual hosts. The Shapiro-Wilk method or distribution models of those measurements were fitted. The diffusion coefficient (C) was calculated to decide hosts' distribution pattern. Result: Average density of the two nest ferns in PFs was 111.2 individual·hm-2, and in DPFs was 210.6 individual·hm-2. Average density of hosts in PFs and DPFs were 72.8 and 117.8 individual·hm-2, respectively. The sum of host species was 79 species which belong to 53 genera of 31 families. All the hosts are tree species except Tetrastigma planicaule, a vine of N. nidus could only be found on 25 host species and P. coronans was only present on 17 host species. There were 24 host species could only be found in PFs and 48 in DPFs. And 7 host species (i.e. common host species) could be found in both types of plots. The height of the two nest ferns were in the range of 0.5-25.0 m, but 69.5% of them lower than 10 m and 39.7% of them in a height range of 5.0-9.0 m. Ferns size, ferns density, hosts density, and ferns on per host could be described well by negative exponential function. Hosts in PFs and DPFs were clumped distribution patterns. Conclusion: In rain forests of the study region, the two nest epiphytic ferns tended to fasten on hosts in a height range of 5.0-9.0 m although they could be found in height range of 0.5-25.0 m, and they were in clumped distribution patterns in the horizontal direction. It was interesting that ferns size and density, hosts density and ferns on per host appeared an inverse “J” pattern together. To explore the reason why more of the two nest epiphytic ferns were present in DPFs than in PFs, it was recommended that the relations of their richness and abundance with forest community type, structure and microclimate should be analyzed next step. © 2016, Editorial Department of Scientia Silvae Sinicae. All right reserved.


Wang X.,Research Institute of Forest Resource Information Techniques | Chen E.,Research Institute of Forest Resource Information Techniques | Li Z.,Research Institute of Forest Resource Information Techniques | Yao W.,Xi'an University of Science and Technology | Zhao L.,Research Institute of Forest Resource Information Techniques
Cehui Xuebao/Acta Geodaetica et Cartographica Sinica | Year: 2015

In order to study SAR land cover classification method, this paper uses the multi-dimensional combination of temporal, polarization and InSAR data. The area covered by space borne data of ALOS PALSAR in Xunke County, Heilongjiang Province was chosen as test site. A land cover classification technique of SVM based on multi-temporal, multi-polarization and InSAR data had been proposed, using the sensitivity to land cover type of multi-temporal, multi-polarization SAR data and InSAR measurements, and combing time series characteristic of backscatter coefficient and correlation coefficient to identify ground objects. The results showed the problem of confusion between forest land and urban construction land can be nicely solved, using the correlation coefficient between HH and HV, and also combing the selected temporal, polarization and InSAR characteristics. The land cover classification result with higher accuracy is gotten using the classification algorithm proposed in this paper. ©, 2015, SinoMaps Press. All right reserved.


Qin X.L.,Research Institute of Forest Resource Information Techniques | Zhang Z.H.,State Laboratory for Remote Sensing and Information Techniques | Yan H.,State Laboratory for Remote Sensing and Information Techniques
WIT Transactions on Ecology and the Environment | Year: 2012

FengYun-3 (FY-3) is the second generation Polar Orbiting Meteorological Satellite Series of Chinese meteorological satellite. FY3A and FY3B were launched in the year 2008 and the year 2010 respectively. The Visible and Infrared Radiometer (VIRR) carried by FY3A/B (FY3A/B-VIRR), which spatial resolution is 1,100 meter at nadir and saturation temperature is more than 350k in central wavelength at 3.74μm channel. Based on the analyzing results of related bands of FY3A/B-VIRR by using typical samples, the algorithm applies dynamic thresholds to fire identification according to the character of FY3A/B-VIRR images. The automatic forest fire identification program has been developed and integrated the background GIS data in IDL language. At the same time, the methodology and identification results have been validated by selecting forest fires which have taken place in the northeast or south forest region of China in nearly four years. The validation results showed that the commission is more than 90% and the average omission is less than 10%. So, the fire identification methodology can be satisfied regarding the need for the forest fire identification operation in China. © 2012 WIT Press.


Hua L.,Research Institute of Forest Resource Information Techniques | Wentao Z.,CAS Institute of Remote Sensing | Wentao Z.,Research Institute of Forest Resource Information Techniques | Bingfang W.,CAS Institute of Remote Sensing | Hongbo J.,Research Institute of Forest Resource Information Techniques
IOP Conference Series: Earth and Environmental Science | Year: 2014

The aim of this study was to investigate the utility of datasets composed of texture measures and other features for the classification of vegetation cover, specifically wetlands. QUEST decision tree classifier was applied to a SPOT-5 image sub-scene covering the typical wetlands area in Three River Sources region in Qinghai province, China. The dataset used for the classification comprised of: (1) spectral data and the components of principal component analysis; (2) texture measures derived from pixel basis; (3) DEM and other ancillary data covering the research area. Image textures is an important characteristic of remote sensing images; it can represent spatial variations with spectral brightness in digital numbers. When the spectral information is not enough to separate the different land covers, the texture information can be used to increase the classification accuracy. The texture measures used in this study were calculated from GLCM (Gray level Co-occurrence Matrix); eight frequently used measures were chosen to conduct the classification procedure. The results showed that variance, mean and entropy calculated by GLCM with a 9*9 size window were effective in distinguishing different vegetation types in wetlands zone. The overall accuracy of this method was 84.19% and the Kappa coefficient was 0.8261. The result indicated that the introduction of texture measures can improve the overall accuracy by 12.05% and the overall kappa coefficient by 0.1407 compared with the result using spectral and ancillary data.


Huang S.,Chinese Academy of Forestry | Wang B.J.,FPInnovations Wood Products | Lu J.,Chinese Academy of Forestry | Dai C.,FPInnovations Wood Products | And 2 more authors.
BioResources | Year: 2012

Changbai larch (Larix olgensis Henry) is one of the main plantation species in the northern part of China, but so far its utilization has been limited to solid wood, pulping, and paper products. As part of a national initiative, the objective of this work was to develop a good understanding concerning how stand management practices affect larch wood and veneer properties. To cope with the variation of initial and final stand density, the term "relative thinning intensity (RTI)" was introduced to describe the effect of stand thinning on the resulting wood and veneer properties. Nine representative sample trees each from four stands were harvested, then trimmed and bucked. Six 1.25 m long bolts along the entire tree stem were systematically cut to peel 2.6 mm thick veneers. Clear wood specimens were also sawn from matched bolts for mechanical testing for the purpose of comparison and validation. The correlation between the main tree variables and properties of clear wood and veneer was analyzed, and the influence of RTI on key wood and veneer properties was examined and compared. A good correlation was found in density and modulus of elasticity (MOE) between larch clear wood and veneer, giving an R2 of 0.75 and 0.71, respectively. This indicates that veneering can be potentially used to characterize this larch species. The stand with the lowest RTI had the shortest rotation but yielded the best properties of both clear wood and veneer, which highlights the importance of stand management in terms of thinning.


Huang S.,Chinese Academy of Forestry | Wang B.J.,FPInnovations Wood Products | Lu J.,Chinese Academy of Forestry | Lei Y.,Research Institute of Forest Resource Information Techniques | And 2 more authors.
BioResources | Year: 2012

This is the second part of a large research initiative aimed at characterizing Changbai larch (Larix olgensis Henry) for veneer and high-valued product potential. The objective of this work was to investigate the effect of the tree growth characteristics, particularly diameter at breast height (DBH) and radial growth from pith (or peeler core) to bark on clear wood and veneer properties. A population of 36 trees was chosen and classified into three DBH classes, namely 20, 25, and 30 cm, and crosscut into six segments each along the vertical stem. With the entire veneer ribbon peeled from the pith to bark for each segment, the effect of sapwood and heartwood on wood properties was revealed. The tree DBH and height were moderately and positively correlated. The tree DBH significantly affected properties of both clear wood and veneer in a similar pattern. For the larch veneer population, veneer mean ultrasonic propagation time (UPT) and density decreased but veneer mean dynamic modulus of elasticity (MOE) increased from the heartwood to sapwood or from the pith to bark. Among the three DBH classes, the 25 cm DBH yielded the highest mean veneer density and MOE, followed by the 20 cm DBH and 30 cm DBH. This was found to be caused by the radial evolution of veneer properties from the pith to bark in combination with the variation of veneer yield and stem position.


Zou W.,Research Institute of Forest Resource Information Techniques | Zhang H.,Research Institute of Forest Resource Information Techniques | Ju H.,Research Institute of Forest Resource Information Techniques | Liu H.,Research Institute of Forest Resource Information Techniques
Key Engineering Materials | Year: 2012

Based on the brightness, greenness, humidity indices after Tasseled Cap transformation, NDWI and DEM. Extracting the alpine wetland information in source regions of three Rivers. Result shows that: the humidity can be used to distinguish wetland types from non-wetland classes, brightness component is effective in grassland extracting, while bare rock and gravel land, sand land etc. could be distinguished through its high value on lightness component. Elevation and slope component could be taken as the threshold variable in distinguishing the marsh and bare rock and gravel land. It shows that RS feature index based classification method used on Alpine wetland could improve the overall accuracy by 10.71% and Kappa index by 0.1250 after comparing with the maximum likelihood method. The result indicates that, the method based on indices got from image band transformation is an effective way of alpine wetlands information remote sensing extracting. © (2012) Trans Tech Publications.


Wang Y.,CAS Institute of Geographical Sciences and Natural Resources Research | Ju H.,Research Institute of Forest Resource Information Techniques | Zhang H.,Research Institute of Forest Resource Information Techniques | Jiang D.,CAS Institute of Geographical Sciences and Natural Resources Research | Zhuang D.,CAS Institute of Geographical Sciences and Natural Resources Research
African Journal of Agricultural Research | Year: 2011

The functions of wetlands are of significant value to social economy and ecology. However, in the past 50 years, wetlands in China have suffered severely from development pressure and are confronted with the threats of area loss. In recent years, assessment of wetland resources has aroused enormous attention, since it can further protect wetland resources and provide scientific basis for decision-makers. In this paper, wetland ecosystems are studied in terms of its ecological, social, and economic benefits, and integrated assessment system of the sustainability of the wetland resources of East Dongting Lake Nature Reserve has been built, adopting DELPHI method, analytic hierarchy process (AHP) and PSR model. First, an index system of integrated assessment of wetland resources was constructed, and the indexes involve the following five aspects, ecological environment, safeguard system, reasonable utilization of wetlands, social culture and economic system. An index system of integrated assessment for wetland resources established was composed of 5 subsystems, with 34 indicators involved. By conducting field investigation in East Dongting Lake and by performing remote sensing data processing, an integrated assessment score of 1.035 was given to East Dongting Lake. Finally, a general analysis of the study area was given and a few countermeasures were suggested. © 2011 Academic Journals.

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