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| Effects of long-term wheat and maize straw incorporation on phosphorus fractions in lime concretion black soil |
| Received:December 29, 2021 |
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| KeyWord:straw return;lime concretion black soil;inorganic phosphorus fractions;organic phosphorus fractions |
| Author Name | Affiliation | E-mail | | XU Yue | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | | | CHEN Xiang | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | WANG Qingyun | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | | | LUO Laichao | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | | | ZHANG Chaochun | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | | LI Jincai | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | YE Xinxin | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | | | GAO Hongjian | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | | | CHAI Rushan | College of Resources and Environment, Anhui Agricultural University/Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention/Key Laboratory of Jianghuai Arable Land Resources Protection and Eco-restoration, Ministry of Natural Resources/Anhui Engineering Research Center for Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer, Hefei 230036, China | rschai@ahau.edu.cn |
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| Abstract: |
| In order to provide reference for optimal management of phosphorus levels under straw return in typical wheat-maize rotation systems, inorganic and organic phosphorus forms of lime concretion black soil were analyzed with Jiang Bofan-Gu Yichu's method and Bowman-Cole's method under five treatments selected from a long-term field experiment located in north Anhui. The five treatments included no fertilization(CK), conventional fertilization(F), conventional fertilization plus wheat straw return(FWS), conventional fertilization plus maize straw return(FMS), and conventional fertilization plus wheat and maize straw return(FWMS). Correlation analysis and path analysis were applied to examine the relationships between soil phosphorus fractions and available phosphorus. The results showed that wheat and maize straw return significantly increased the contents of total phosphorus and available phosphorus in lime concretion black soil and soil phosphorus activation coefficient. The contents of soil inorganic phosphorus(Ca2-P, Al-P, and Fe-P)and organic phosphorus components(labile, moderately labile, and moderately resistant organic phosphorus)were significantly increased by straw return. The soil Ca2-P contents under the FWS, FMS, and FWMS treatments increased by 32.3%, 28.4%, and 43.8%, respectively, compared with those under the F treatment. Soil Al-P contents under the three treatments(FWS, FMS, and FWMS)increased by 15.3%, 10.7%, and 13.4%, respectively. Wheat and maize straw incorporation had no significant influence on soil O-P contents in the lime concretion black soil. Furthermore, in comparison with the F treatment, the soil Ca8-P contents under FMS and FWMS treatments significantly increased, while the contents of Ca10-P and highly resistant organic phosphorus decreased. Besides, the proportions of Ca2-P in lime concretion black soil were significantly elevated by wheat and maize straw return, while the proportions of O-P, Ca10-P, and highly resistant organic phosphorus decreased. Correlation analysis showed that soil Al-P, Fe-P, Ca2-P, and moderately labile organic phosphorus were significantly positively correlated with the soil available phosphorus content. Path analysis indicated that soil Al-P, Ca 2-P, and moderately labile organic phosphorus were the major direct contributors to soil available phosphorus. On the basis of these results, it can be concluded that wheat and maize straw incorporation is an effective way to promote the conversion of unavailable phosphorus into available phosphorus and slowly available phosphorus in lime concretion black soil. There were no significant differences among singleseason and double-season straw return treatments in terms of soil phosphorus activation. |
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