Now, the study of non-point source (NPS) pollution of large and medium-sized basin is still not common. In this paper, spatial-temporal changes of non-point source pollution in Songliao Basin over the last 15 years were studied based on the simulation of its load by export coefficient model. The results indicated that, the non-point load caused by land use change increased year by year. For TN, it increased from 1.07?106 in 1986 to 1.12?106 in 2000, and for TP, it increased from 3.4?104 in 1986 to 3.6?104 in 2000. Heilongjiang Province was the most important contributor, with an average annual contribution-ratio of 37.9% and 38.8% for TN and TP respectively. The region of Jilin Province and the watershed of the Dongliao River are two highest NPS pollution load intensity areas that should be gained more attention in the future, with average annual 1.45 t/km2, 0.05 t/km2 and 2.21t/km2, 0.07 t/km2 respectively for TN and TP. Using the method put forward in this paper, spatial simulation of NPS pollution can be effectively carried out in large scale basin such as Songliao Basin.
WANG Xiu-juan, LIU Rui-min, HE Men-chang
. Effect of Land Use/Cover Change on Non-point Source Pollution in Songliao Basin[J]. SCIENTIA GEOGRAPHICA SINICA, 2009
, 29(4)
: 555
-560
.
DOI: 10.13249/j.cnki.sgs.2009.04.555
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