科研进展

【论文题目】Combining rhizosphere and soil-based P management decreases the P fertilizer demand of China by more than half based on LePA model simulations

【论文题目】根际磷管理与土壤磷管理根据LePA模型模拟相结合可使中国的磷肥需求量减少一半以上

【作者】YU Wen jia, LI Hai gang*, Peteh M. NKEBIWE, YANG Xue yun, GUO Da yong, LI Cui lan, ZHU Yi yong, XIAO Jing xiu, LI Guo hua, SUN Zhi, Torsten MÜLLER, SHEN Jian bo

【作者】于文佳，李海港，Peteh M. NKEBIWE，杨学军，郭大勇，李翠兰，朱毅勇，肖靖秀，李国华，孙智，Torsten MÜLLER，申建波

【期刊名称和年（卷、期）】Journal of Integrative Agriculture 2023, 22(8): 2509-2520

【Abstract】Phosphorus (P) is a finite natural resource and is increasingly considered to be a challenge for global sustainability.Agriculture in China plays a key role in global sustainable P management. Rhizosphere and soil-based P management are necessary for improving P-use efficiency and crop productivity in intensive agriculture in China. A previous study

has shown that the future demand for phosphate fertilizer by China estimated by the LePA model (legacy phosphorus assessment model) can be greatly reduced by soil-based P management (the building-up and maintenance approach). The present study used the LePA model to predict the phosphate demand by China through combined rhizosphere and soil-based P management at county scale under four P fertilizer scenarios: (1) same P application rate as in 2012; (2) rate maintained same as 2012 in low-P counties or no P fertilizer applied in high-P counties until targeted soil Olsen-P (TPOlsen) level is reached, and then rate was the same as P-removed at harvest; (3) rate in each county decreased to 1–7 kg ha^–1 yr^–1 after TPOlsen is reached in low-P counties, then increased by 0.1–9 kg ha^–1 yr^–1 until equal to P-removal; (4) rate maintained same as 2012 in low-P counties until TPOlsen is reached and then equaled to P-removal, while the

rate in high-P counties is decreased to 1–7 kg ha^–1 yr^–1 until TPOlsen is reached and then increased by 0.1–9 kg ha^–1 yr^–1 until equal to P-removal. Our predictions showed that the total demand for P fertilizer by whole China was 693 Mt P₂O₅ and according to scenario 4, P fertilizer could be reduced by 57.5% compared with farmer current practice, during the period 2013–2080. The model showed that rhizosphere P management led to a further 8.0% decrease in P fertilizer use compared with soil-based P management. The average soil Olsen-P level in China only needs to be maintained at 17 mg kg^–1 to achieve high crop yields. Our results provide a firm basis for government to issue-relevant policies for sustainable P management in China.

【Keywords】phosphorus reserves; P management; crop; agriculture; China; modelling