Pedosphere 34(1): 236--251, 2024
ISSN 1002-0160/CN 32-1315/P
©2024 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Assessment of soil total phosphorus storage in a complex topography along China's southeast coast based on multiple mapping scales |
Zhongxing CHEN1, Jing LI1,2, Kai HUANG1,3, Miaomiao WEN1, Qianlai ZHUANG4, Licheng LIU5, Peng ZHU6, Zhenong JIN5, Shihe XING1, Liming ZHANG1 |
1 Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002 (China);
2 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 (China);
3 Guangxi Zhuang Autonomous Region Plant Protection Station, Nanning 530022 (China);
4 Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette IN 47907 (USA);
5 Department of Bioproducts and Biosystems Engineering, University of Minnesota-Twin Cities, Saint Paul MN 55108 (USA);
6 Department of Geography, The University of Hong Kong, Hong Kong 999077 (China) |
| ABSTRACT |
| Soil phosphorus (P) plays a vital role in both ecological and agricultural ecosystems, where total P (TP) in soil serves as a crucial indicator of soil fertility and quality. Most of the studies covered in the literature employ a single or narrow range of soil databases, which largely overlooks the impact of utilizing multiple mapping scales in estimating soil TP, especially in hilly topographies. In this study, Fujian Province, a subtropical hilly region along China's southeast coast covered by a complex topographic environment, was taken as a case study. The influence of the mapping scale on soil TP storage (TPS) estimation was analyzed using six digital soil databases that were derived from 3 082 unique soil profiles at different mapping scales, i.e., 1:50 000 (S5), 1:200 000 (S20), 1:500 000 (S50), 1:1 000 000 (S100), 1:4 000 000 (S400), and 1:10 000 000 (S1000). The regional TPS in the surface soil (0–20 cm) based on the S5, S20, S50, S100, S400, and S1000 soil maps was 20.72, 22.17, 23.06, 23.05, 22.04, and 23.48 Tg, respectively, and the corresponding TPS at 0–100 cm soil depth was 80.98, 80.71, 85.00, 84.03, 82.96, and 86.72 Tg, respectively. By comparing soil TPS in the S20 to S1000 maps to that in the S5 map, the relative deviations were 6.37%–13.32% for 0–20 cm and 0.33%–7.09% for 0–100 cm. Moreover, since the S20 map had the lowest relative deviation among different mapping scales as compared to S5, it could provide additional soil information and a richer soil environment than other smaller mapping scales. Our results also revealed that many uncertainties in soil TPS estimation originated from the lack of detailed soil information, i.e., representation and spatial variations among different soil types. From the time and labor perspectives, our work provides useful guidelines to identify the appropriate mapping scale for estimating regional soil TPS in areas like Fujian Province in subtropical China or other places with similar complex topographies. Moreover, it is of tremendous importance to accurately estimate soil TPS to ensure ecosystem stability and sustainable agricultural development, especially for regional decision-making and management of phosphate fertilizer application amounts. |
| Key Words: agricultural management,appropriate mapping scale,digitized conventional soil map,estimation uncertainty,subtropical hilly region |
| Citation: Chen Z X, Li J, Huang K, Wen M M, Zhuang Q, Liu L, Zhu P, Jin Z, Xing S H, Zhang L M. 2024. Assessment of soil total phosphorus storage in a complex topography along China’s southeast coast based on multiple mapping scales. Pedosphere. 34(1): 236–251. |
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