Phosphorus flow analysis of different crops in Dongying District, Shandong Province, China, 1995–2016

Author:

He Huan12,Zhang Lvqing3,Zang Hongwei4,Sun Mingxing5,Lv Cheng1,Li Shuangshuang1,Bai Liyong1,Han Wenyuan3,Dai Jiulan1

Affiliation:

1. Environment Research Institute, Shandong University, QingDao, China

2. College of Resources and Environment, Huazhong Agricultural University, WuHan, China

3. State Key Laboratory of Agricultural Microbiology and College of Life Science and Tech-nology, Huazhong Agricultural University, WuHan, China

4. Yantai Academy of Agricultural Sciences, YanTai, China

5. Chinese Academy of Sciences, Institute of Geographic Sciences and Natural Resources Research, BeiJing, China

Abstract

Investigating the phosphorus (P) sources, pathways, and final sinks are important to reduce P pollution and improve P management. In this study, substance flow analysis (SFA) was performed for P flow analysis from 1995 to 2016 in different crops of Dongying District, a core region of the alluvial delta at the estuary of the Yellow River. The results showed that P input steadily increased from 1.48 × 104 t in 1995 to 2.16 × 104 t in 2007, and then decreased from 1.90 × 104 t in 2010 to 1.78 × 104 t in 2016. Chemical fertilizers made the highest contribution to P input. The cotton with the highest P load was on the top of P load risk ranks. More importantly, this study applied the Partial Least Squares Path Modeling (PLS-PM) model for P flow analysis and established the numerical relationship between the variables (including fertilizers, straws return-to-field, harvested grains, discarded straw, and P erosion and runoff), P use efficiency (PUE) and P load. The analysis revealed that fertilizer and crop production are the key factors affecting the PUE. Therefore, optimizing the use of P-fertilizer whilst maintaining yields can be an effective strategy to improve the local region PUE.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Postdoctoral Science Foundation of Qingdao City

Publisher

PeerJ

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

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