In order to study the spatio-temporal changes on ecological environment and influence factors of the lower reaches of Luanhe river, we collected the remote sensing image(1985—2015) and other ancillary data, and used supervised classification method to extract the dynamic change of ecological factors.The result show that:1) farmlands dominated in 1985, 1990, 1995, 2000, 2005, 2010, and 2015 covering about 1530.59km2, 1388.88km2, 1388.15km2, 1121.88km2, 1166.48km2, 1017.07km2 and 883.15km2 respectively, although farmland has been in a downward trend.2) From 1985 to 2015, the forest area and grass land has shown a rising trend, the rising rate of forest is 15.78km2 every five years, the rising rate of grass land is 9.23km2 every five years.3) The cultivated land area change is in a rapid decline trend in nearly 30 years, decline rate is 103.8km2 every five years.The building land area in 2015 is about three times of 1985, increase rate is 83.00km2 for every five years.The water area is in decline too, decline rate is 4.11km2 every five years.4) Expansion of cities and towns are the main factors influencing the ecological environment of the lower reaches of Luanhe river.
CHEN Mingye
,
CHEN Lei
,
LIU Suhong
,
GAO Baojia
. The Spatio-temporal Changes on Ecological Environment of the Lower Reaches of Luanhe River from 1985 to 2015[J]. Forest and Grassland Resources Research, 2016
, 0(5)
: 118
-123
.
DOI: 10.13466/j.cnki.lyzygl.2016.05.021
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