Spatial-Temporal Variation of N, P, and K Stoichiometry in Cropland of Hainan Island

Chunhua Ji, Hailin Liu, Zhengzao Cha, Qinghuo Lin and Gu Feng
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Chunhua Ji: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
Hailin Liu: China Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Zhengzao Cha: China Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Qinghuo Lin: China Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
Gu Feng: College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

Agriculture, 2021, vol. 12, issue 1, 1-16

Abstract: Elemental stoichiometry reflects the interaction between plants, soil, and microorganisms, and links biogeochemical patterns with physiological limitations. The stoichiometry of elements in farmland soil is an important part of the function of the agroecosystem. Soil nitrogen (N), phosphorus (P), and potassium (K) are the main macronutrients in terrestrial ecosystems, which are closely related to biogeochemical cycles. Studying the temporal and spatial variability of soil nutrients in tropical farmland is of great significance for exploring the variation of soil nutrients and promoting the sustainable development of tropical agriculture. In this study, soil samples in the farmland of Hainan Island were collected at three different stages for exploring temporal and spatial variations of N, P, and K stoichiometry. Results showed that soil concentrations of available N, P, and K changed markedly with the temporal and spatial variability. The highest available N, P, and K concentrations appeared at the stage of 2016–2020 with values of 110.40 mg/kg, 51.91 mg/kg, and 82.76 mg/kg, respectively, while their lowest values were observed in 2010–2015 with 66.34 mg/kg, 11.27 mg/kg, and 45.77 mg/kg, respectively. The available nitrogen content in the three time periods first increased and then decreased with the increase of available potassium content, an opposite trend was observed between available nitrogen and phosphorus. The content of N increased in Haikou, Lingao, Ding’an, and P increased in Wengchang, and Lingshui and K increased in Danzhou and Wanning as time increased.

Keywords: Hainan Island; soli nutrient; spatial-temporal variability; stoichiometry (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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