Dong, GT等:Spatial evaluation of phosphorus retention in riparian zones using remote sensing data
被阅读 2177 次
2014-10-21

Spatial evaluation of phosphorus retention in riparian zones using remote sensing data
作者:Dong, GT (Dong, Guotao)[ 1,2,3 ] ; Yang, ST (Yang, Shengtian)[ 1,2 ] ; Gao, YF (Gao, Yunfei)[ 4 ] ; Bai, J (Bai, Juan)[ 1,2 ] ; Wang, XL (Wang, Xuelei)[ 5 ] ; Zheng, DH (Zheng, Donghai)[ 6 ]
ENVIRONMENTAL EARTH SCIENCES
卷: 72  期: 5  页: 1643-1657
DOI: 10.1007/s12665-014-3069-0
出版年: SEP 2014
摘要
Riparian zones act as important buffer zones for non-point source pollution, thus improving the health of aquatic ecosystems. Previous research has shown that riparian zones play an important role, and that land use has an important effect, on phosphorus (P) retention. A spatial basin-scale approach for analyzing P retention and land use effects could be important in preventing pollution in riparian zones. In this study, a riparian phosphorus cycle model based on EcoHAT was generated with algorithms from soil moisture and heat models, simplified soil and plant phosphorus models, plant growth models, and universal soil loss equations. Based on remote sensing data, model performance was enhanced for spatial and temporal prediction of P retention in the riparian zone. A modified soil and plant P model was used to simulate the soil P cycle of a riparian zone in a temperate continental monsoon climate in northern China. A laboratory experiment and a field experiment were conducted to validate the P cycle model. High coefficients of determination (R 2) between simulated and observed values indicate that the model provides reliable results. P uptake variations were the same as the net primary productivity (NPP) trends, which were affected by soil temperature and moisture in the temperate continental monsoon climate. Beginning in June, the monthly content increased, with the maximum appearing in August, when the most precipitation and the highest temperatures occur. The spatial distribution of P uptake rates from March to September showed that areas near water frequently had relatively high values from May to August, which is contrary to results obtained in March, April, and September. The P uptake amounts for different land uses changed according to expectation. The average monthly P uptake rates for farmlands and grasslands were more than those for orchards and lowlands, which had moderate P uptake rates, followed by shrubs and forests. The spatial distribution of soil erosion demonstrated that the soil erosion came primarily from high-intensity agricultural land in the western and central areas, while the northern and eastern study regions, which were less affected by human activity, experienced relatively slight soil erosion. From the point of view of P pollution prevention, the spatial structure of riparian zones and the spatial distribution of land use around the Guanting reservoir are thus not favorable.
通讯作者地址: Yang, ST (通讯作者)
 Beijing Normal Univ, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China.
地址:
 [ 1 ] Beijing Normal Univ, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China
 [ 2 ] Beijing Normal Univ, Remote Sensing Applicat Chinese Acad Sci, Res Ctr Remote Sensing & GIS,Sch Geog, Beijing Key Lab Remote Sensing Environm & Digital, Beijing 100875, Peoples R China
 [ 3 ] Yellow River Conservancy Commiss, Yellow River Inst Hydraul Res, Zhengzhou 450003, Peoples R China
 [ 4 ] Yellow River Conservancy Commiss, Upper & Middle Yellow River Bur, Xian 710021, Peoples R China
 [ 5 ] Satellite Environm Ctr, Minist Environm Protect, Beijing 100094, Peoples R China
 [ 6 ] Univ Twente, Fac Engn Technol, Dept Civil Engn, NL-7500 AE Enschede, Netherlands