Từ bản đồ giao thông, bản đồ phân bố khu dân cư, bản đồ độ cao, bản đồ độ dốc thông qua các phần mềm chuyên dụng đã xây dựng bản đồ phân cấp mức độ khó khăn cho bảo vệ rừng của lưu vực. Kết hợp bản đồ kiểm kê rừng và bản đồ phân cấp mức độ khó khăn cho bảo vệ rừng của lưu vực, đã xây dựng được các bản đồ: + Xác định hệ số K1 theo trạng thá...
11 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 1039 | Lượt tải: 0
Vietnam is one of the biggest rice exporting country in the world in which the Mekong Delta accounts for over half of the country's rice production. Rice is the dominant plant grown in Vietnam and Asia. Therefore, it becomes necessary to monitor and estimate rice acreage in a large area for the management and planning of the managers. The advant...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 756 | Lượt tải: 0
The Halong Bay geological wonder was estimated by four criteria. The first criterion on geological diversity consists of the items such as material formations of lithology, minerals and fossils; geological tectonics, structures and evolution, geological environment; landform-geomorphology; and natural landscape. The second on unique, unusualness ...
11 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 721 | Lượt tải: 0
In recent years, river bank and bed erosion has been one of the most severe problems and caused much damage to economic-social activities and environment of Cuu Long and South-eastern regions. Soai Rap River (Ho Chi Minh City) has been chosen as main navigational channel for big ships with 70.000 DWT to Hiep Phuoc Port. Dredging up to 12m carrie...
9 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 646 | Lượt tải: 0
The aim of this study is to assess the environmental impacts for petroleum activities on block 07/03 offshore, southeast Vietnam. The results of the Environmental Sample Analysis at Block 07/03, from 4 sampling stations for well are distributed in two perpendicular axes at the vicinities of CRD - 2X well are focused to survey. Distance from sampl...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 658 | Lượt tải: 0
Xuan Thuy National Park with its characteristic mangrove forest ecosystem is located in the Southeast Giao Thuy district, Nam Dinh province. It also belongs to the biosphere reserve of Red River Delta. Based on the analysis of remote sensing images taken in 1986, 1995 and 2015, we built up maps and determined the variation of mangrove area of Xu...
5 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 712 | Lượt tải: 0
Data on climate, sea level, sedimentation, mangrove area and distribution, public awareness of mangroves, and participation of communities in the protection and development of mangrove forests in Dong Rui (Tien Yen - Quang Ninh), Xuan Thuy National Park (Nam Dinh) and coastal area of Hau Loc district (Thanh Hoa) was collected, measured and analy...
6 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 765 | Lượt tải: 0
In recent years, significant pressure of social and economic development has caused several environmental problems in Ba Be district. The initial studies of the authors in environmentally sensitive areas of Ba Be district result in this ranking: The natural water - Ba Be lake: Very sensitive; The urbanization - Cho Ra town: average sensitive; Na...
7 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 620 | Lượt tải: 0
Using Landsat satellite images and GIS to classify vegetation cover in Ta Xua natural Reserve showed: in 1999, the area of Closed forest is 11258 ha, Open forest is 2317 ha Poor forest is 1620.8 ha, Scrub, Scrub and grassland is 1492.9 ha and Agriculture land is 1252.4 ha. In 2014 the area of each types in the order of: 5105.5 ha, 5602.5 ha, 286...
9 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 853 | Lượt tải: 0
Based on analyzing 415 individuals of bees and wasps sampled during 7 surveys from 2011 to 2012 in two locations within agricultural and rural-urban areas adjacent to Ha Noi city, we noticed that species number and abundance of several bees and wasps are considerably changed according to the degree of urbanization and environmental changes. Of ...
8 trang | Chia sẻ: honghp95 | Ngày: 28/11/2020 | Lượt xem: 705 | Lượt tải: 0
Copyright © 2025 Tai-Lieu.com - Hướng dẫn học sinh giải bài tập trong SGK, Thư viện sáng kiến kinh nghiệm hay, Thư viện đề thi