The long-term soil phosphorus balance across Chinese arable land

Ma, Jinchuan and Liu, Yingxia and He, Wentian and He, Ping and Haygarth, Philip Matthew and Surridge, Benjamin William James and Lei, Qiuliang and Zhou, Wei (2018) The long-term soil phosphorus balance across Chinese arable land. Soil Use and Management, 34 (3). pp. 306-315. ISSN 0266-0032

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Quantifying temporal and spatial variation of soil phosphorus (P) input, output and balance across Chinese arable land is necessary for better P management strategies. Here, we address this challenge using a soil P budget to analyse the soil P balance in arable land across the whole of China, for the period 1980–2012. Results indicated that the total P input to soil increased from 22.5 kg P/ha in 1980 to 79.1 kg P/ha in 2012. However, the total P output from soil only increased from 17.9 kg P/ha in 1980 to 36.9 kg P/ha in 2012. Therefore, the average net soil P surplus in China increased from 4.6 kg P/ha in 1980 to 42.1 kg P/ha in 2012. Our research found great variation in soil P balances across different regions. Soil P balance varied between regions with the order of southeast (SE) > north central (NC) and the middle and lower reaches of Yangtze River (MLYR) > southwest (SW) > northwest (NW) > northeast (NE). Phosphorus that has accumulated in agricultural soil across China could theoretically meet crop P demands for approximately 4.8–12.0 yrs, depending on the bioavailability of P stored in soils. Increasing the return rates of manure and straw could substantially reduce the demand for fertilizer-P. This paper represents a basis for more targeted, regionally informed P fertiliser recommendations in Chinese soils.

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Journal Article
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Soil Use and Management
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24 Oct 2018 09:10
Last Modified:
08 Dec 2022 00:32