Search

Copyright of Hydrogeology & Engineering Geology / Shuiwendizhi Gongchengdizhi is the property of Hydrogeology & Engineering Geology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Rural Water & Hydropower is the property of China Rural Water & Hydropower Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Plateau Meteorology is the property of Plateau Meteorology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] The present paper systematically studied the relationship between vegetation cover and surface temperature, and the temperature effect of forest land in small area. [Method] Based on the remote sensing image data of Wuchuan County in Inner Mongolia from 2000 to 2015 and the distribution map of public welfare forest in the corresponding years, the vegetation coverage and surface temperature data were extracted based on the pixel dichotomy model and the radiation transfer equation. Through the spatial analysis function of Arcgis10. 2, the changes of vegetation cover and surface temperature and the temperature effect of forest land in Wuchuan County were analyzed, and the relationship between them was studied by contribution value calculation and correlation analysis. [Result] The vegetation coverage of Wuchuan County was good, the low and middle coverage accounted for the main position, followed by high coverage. The vegetation development was good in 15 years, and the vegetation area of high coverage increased by 522. 13 km² . The surface temperature decreased year by year, and the temperature difference decreased to 17. 2 °C at the end of the study, and the development was stable. The effect of vegetation cover on surface temperature is mainly reflected in the middle and high coverage. There is a significant negative relationship between vegetation cover and surface temperature. Forest resources in Wuchuan County can effectively reduce surface temperature. The temperature difference between forest land and non-forest land is obvious, and the cooling effect of forest land decreases with the increase of distance. Effective cooling range is O -150 meters. Forest land has the best cooling effect, followed by shrub land and sparse woodland. [Conclusion] The development of vegetation coverage in Wuchuan County is good, the surface temperature is controlled, and the forest land a certain cooling effect [ABSTRACT FROM AUTHOR]

[Objective】 In this paper, the vegetation coverage of the research area for the period 2000 - 2017 was calculated by using the veg¬ etation index product (MODIS13QI) with spatial resolution of 250 meters and 16 days synthesis.【Method】 The spatial and temporal charac¬teristics of vegetation cover in the northern foothills of the central part of Tianshan, China were studied by using differential analysis in the past 18 years, and the annual and quarterly vegetation cover area was evaluated using the quantitative evaluation model of change trend.【Re- suit】 The results showed that the spatial characteristics of vegetation coverage in the northern foot of the central Tianshan Mountains gradually increased from the north to the middle to the south % The intensity of spatial changes in vegetation growth was gradually reduced fromsummer to autumn to spring. In the quantitative evaluation of annual dynamic changes in vegetation coverage, the degree of degradation was: summer spring > autumn % the annual degraded area accounted for 0. 27 % of tlie total area% The stable area of -0. 1 -0. 1 was： spring > au¬tumn > summer, annual stable area covered 84.46 % of tlie whole area% The improvement areas greater than 0. 1 were： summer > autumn spring, and the annual improvement area accounts for 15 . 27 % of the entire area. The change of the non-significant area was as follows: spring > summer > autumn, and the annual non-significant vegetation area was 64.39 % % the apparent increase trend was： summer autumn > spring, and the annual increase in area accounts for 29 . 13 %. 【Conclusion 】Through quantitative evaluation of the temporal and spatial changes of vegetation cover， the 3 value and the corresponding degree of vegetation change are defined. The seasonal vegetation cover area decreases from strong to weak and appears as ： spring > autumn > summer % The investigation of annual and quarterly vegetation dynamic changes in the study area provides a certain theoretical basis and data support for vegetation and ecological environmental protection in the northem foot of tlie central Tianshan mountains [ABSTRACT FROM AUTHOR]

【Objective】Due to the large fragmentation of cultivated land in hilly regions, it is difficult to extract high-precision cultivated land information by medium-resolution remote sensing images. How to improve the classification accuracy of applying medium-resolution remote sensing images to extract cultivated land in hilly regions is an urgent problem to be solved. 【Method】Based on the difference of cultivated land and other landforms in time series of vegetation cover and the analysis of multi-temporal remote sensing images, this paper proposed a method of cultivated land extraction based on combining crop tillage rhythm and multi-temporal remote sensing images. 【Result】Using this method success extract the cultivated land in Huili, Sichuan, which showed that the method was suitable for extraction of cultivated land in hilly regions. 【Conclusion】This method has high extraction speed, and the result has certain current situation and high accuracy. It can meet the requirements for timely acquisition of cultivated land information in cultivated land use and management and can be applied to the correction of land parcels in historical farmland vector data, and to update the missing points. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Central China Normal University is the property of Huazhong Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Sciencepaper is the property of China Sciencepaper and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)