Water quality related to Conservation Reserve Program (CRP) and cropland areas: Evidence from multi-temporal remote sensing

文献类型： 外文期刊

第一作者： Yin, Dameng

作者： Yin, Dameng;Wang, Le;Yin, Dameng;Zhu, Zhenduo;Dai, Ning;Clark, Susan Spierre;Cao, Ying;Besek, Jordan

作者机构：

关键词： Conservation reserve program; Cropland change; Water quality; Remote sensing; Google earth engine; Coupled natural and human; Illinois River Basin

期刊名称：INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION （ 影响因子：5.933； 五年影响因子：6.225 ）

ISSN： 1569-8432

年卷期： 2021 年 96 卷

页码：

收录情况： SCI

摘要： Water quality is affected by croplands. The Conservation Reserve Program (CRP), where farmers convert croplands to natural land cover (e.g., trees), is expected to improve water quality. However, whether such improvements are achieved alongside cropland area change has not been verified at river-basin scales, due to challenges in large scale observations. Therefore, aiming to quantify the relationship between CRP enrollment, cropland area, and the downstream water quality, we propose an approach that combines archived survey data, water quality monitoring data (total nitrogen content, TN), and remote sensing observations. By constructing the long-term datasets (1999-2014 annually) in Google Earth Engine and conducting multiple linear regression, we explained 79% variation in TN by the area of total CRP enrollment (CRP_all), area of corn and soybeans croplands, and discharge. Moreover, 78% is explained if we consider only water quality targeted conservation practices (CRP_WQ). Our results indicate significant positive correlation between CRP enrollment (both CRP_all and CRP_WQ) and the downstream water quality. Nevertheless, it should be noted that correlation does not necessarily represent causation. While this pioneer effort of quantifying impacts of the CRP on water quality from large scale observations has achieved some success, we call for more research to expand the spatial and/or temporal scales and consider more water quality variables, so as to further enhance our understanding of the coupled natural-and-human system.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序