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| Change of red soil acidity from legume cultivation in a young citrus orchard |
| Received:June 20, 2016 |
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| KeyWord:red soil acidification;pH;exchangeable acidity;Chamaecrista rotundifolia;Lotononis bainesii |
| Author Name | Affiliation | E-mail | | CAI Ze-jiang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sciences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China | | | XU Ming-gang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | mgxu@caas.ac.cn | | ZHANG Lu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sciences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China | | | WANG Bo-ren | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sciences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China | | | WEN Shi-lin | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sciences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China | | | SHEN Hua-ping | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China
Hengyang Red Soil Experimental Station, Chinese Academy of Agricultural Sciences, Qiyang Agro-ecosystem of National Field Experimental Station, Qiyang 426182, China | |
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| Abstract: |
| The objective of this study was to investigate the effects of two common legumes(Chamaecrista rotundifolia and Lotononis bainesii) on the acidification of red soil compared with conventional management. A field experiment(2010-2011) and an incubation experiment were conducted and changes in soil pH, exchangeable acidity, and exchangeable aluminum, as well as their relationships with soil nutrient concentrations were determined. After two-year planting, Chamaecrista rotundifolia significantly increased soil pH by 0.19 units at the 0~20 cm depth compared with initial soil pH, but no significant change for Lotononis bainesii treatment. As compared with the control, soil pH increased by 0.26 and 0.39 units for 0~20 cm and 20~40 cm depths, respectively, in Chamaecrista rotundifolia treatment; Chamaecrista rotundifolia significantly decreased soil exchangeable acidity and exchangeable aluminum at the 0~20 cm depth by 1.25 cmol(+)·kg-1 and 1.35 cmol(+)·kg-1, respectively, and at the 20~40 cm depth by 1.07 cmol(+)·kg-1 for both parameters. Soil exchangeable aluminum was negatively correlated with soil total nitrogen, while soil total nitrogen was positively correlated with soil organic matter and available phosphorus. Incubation experiment showed that ash alkalinity content and application rates determined the effects of legumes on soil acidity. Results indicated that the cultivation of legumes in orchard did not accelerate acidification of soil at the 0~40 cm depth, and some legume species such as Chamaecrista rotundifolia could ameliorate the acidification of the red soil. |
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