Analysis of water purification function in the Pearl River basin in Guizhou Province using InVEST model

HAN Huiqing,LUO Xuqiang,YOU Renlong,LUO Xiaoshan,CHEN Yao

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (05) : 87-92.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 40 ›› Issue (05) : 87-92. DOI: 10.3969/j.issn.1000-2006.2016.05.014

Analysis of water purification function in the Pearl River basin in Guizhou Province using InVEST model

  • HAN Huiqing1,LUO Xuqiang2*,YOU Renlong3,LUO Xiaoshan3,CHEN Yao3
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Abstract

Water purification function plays an important role in ensuring water quality in the whole basin and has great significance to sustainable economic and social development. Based on the remote sensing data of Landsat TM/ETM+, this paper explored the change of water purification function from 2000 to 2010 in the Pearl River basin in Guizhou Province using the InVEST model. The results showed that: ① the forest land, arable land and grassland dominated the land use types. Areas of these land use types accounted for more than 98.00% of the total area. Areas of forestland, grassland, built-up land and water body increased while the area of arable land declined. The 1 002 and 713 km2 declined arable land converted into forestland and grassland, respectively. The unused land remained unchanged. ② The average outputs and retentions of nitrogen(N)and phosphorous(P)in the whole basin decreased by 6.67% and 4.99%, respectively. The average outputs of N, P in Liujiang and Nanpanjiang basins were less than that in Beipanjiang and Hongshuihe basins. The average retentions of N, P in each basin showed that Nanpanjiang and Beipanjiang basins>Hongshuihe basin>Liujiang basin. The average outputs and retentions of N, P decreased in most part of the basin. The average outputs and retentions of N, P increased in a few parts of the basin. The spatial heterogeneity of land use pattern and the Green for Grain Project are the main factors affecting the spatial and temporal characteristic of water quality purification function in the basin.

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HAN Huiqing,LUO Xuqiang,YOU Renlong,LUO Xiaoshan,CHEN Yao. Analysis of water purification function in the Pearl River basin in Guizhou Province using InVEST model[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2016, 40(05): 87-92 https://doi.org/10.3969/j.issn.1000-2006.2016.05.014

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