ORIGINAL RESEARCH
Relations between Microtopography and Soil N
and P Observed by an Unmanned Aerial Vehicle
and Satellite Remote Sensing (GF-2)
| 1 | College of Water Sciences, Beijing Normal University, Beijing Key Laboratory for Remote Sensing
of Environment and Digital Cities, Beijing 100875, China |
| 2 | Beijing Weather Modification Office, Beijing, 100089, China |
| 3 | Satellite Environment Center of MEP, Beijing 100094, China |
| 4 | School of Biological Science, Georgia Institute of Technology, 310 Ferst Dr NW, Atlanta, Georgia, 30332, USA |
Submission date: 2019-08-22
Final revision date: 2019-11-04
Acceptance date: 2020-01-14
Online publication date: 2020-09-07
Publication date: 2020-10-05
Pol. J. Environ. Stud. 2021;30(1):257–271
KEYWORDS
TOPICS
ABSTRACT
Topography is important for soil nutrient loss and critical source area (CSA) identification. Previous
studies have primarily used mass soil sampling to explore the relations between topography and soil
nutrients (especially N and P) at the coarse scales. The relations at the microtopographic scale, however,
remain unclear. This study integrated unmanned aerial vehicle (UAV) and satellite remote sensing
(GF-2) data to create two new indices – NDVI(N) and NDVI(P). Results revealed more pixels with
high NDVI(N) values distributed across low elevation difference grades in paddy land; however, this
was reversed for dry land. There were more NDVI(P) pixels with large (small) values at high (low)
elevation difference grades in the dry land (paddy land). In dry land, the average NDVI(N) was in the
range of 0.25-0.33, and NDVI(P) was in the range of 0.47-0.61 for each elevation grade. In paddy land,
the average NDVI(N) and NDVI(P) values for each elevation grade were in the range of 0.24-0.32 and
0.31-0.43, respectively. Microtopography can redistribute N and P spatially within the soil because
it changes the direction of flow from irrigation and rainfall and of sediment flow from erosion.
Furthermore, soil N and P accumulate simultaneously in the soil of agricultural land.
RELATED ARTICLE
We process personal data collected when visiting the website. The function of obtaining information about users and their behavior is carried out by voluntarily entered information in forms and saving cookies in end devices. Data, including cookies, are used to provide services, improve the user experience and to analyze the traffic in accordance with the Privacy policy. Data are also collected and processed by Google Analytics tool (more).
You can change cookies settings in your browser. Restricted use of cookies in the browser configuration may affect some functionalities of the website.
You can change cookies settings in your browser. Restricted use of cookies in the browser configuration may affect some functionalities of the website.