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棉花学报  2015 

秸秆还田对滨海盐碱地棉苗光合特性及生长的影响

DOI: 10.11963/issn.1002-7807.201503008, PP. 248-253

Keywords: 棉花,滨海盐碱地,秸秆还田,光合特性

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Abstract:

为探讨秸秆还田对滨海重度盐碱地棉苗光合特性及生长的影响,设置增施有机肥、播前秸秆还田、冬前秸秆还田3个处理,测定了棉花苗期3个层次土壤含盐量、水分和容重,棉花叶片光合参数、叶片SPAD值以及干物质积累和棉花产量。结果表明,与对照相比,增施有机肥和秸秆还田的处理各个土层含盐量和容重明显降低,棉苗叶片LAI和SPAD明显增大,光合能力提高,干物质积累量、根冠比以及棉花产量明显增加。其中,冬前秸秆还田各土层含盐量低于2.00g·kg-1,容重保持在1.15~1.40g·cm-3,叶片SPAD值高于40.0,LAI提高65.5%,光合性能系数增高23.4%~92.8%,非光化学淬灭系数(NPQ)降低12.2%,干物质积累总量增大46.3%,根冠比提高56.5%,产量提高36.2%。因此,在本试验条件下,冬前秸秆还田更有利于滨海盐碱地改良及棉苗的正常生长。

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