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| Effect of phosphorus application rates on sunflower growth and soil microflora in severe saline land |
| Received:August 10, 2016 |
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| KeyWord:severe saline soil;P application;sunflower;protective enzymatic activity;P uptake;soil microflora |
| Author Name | Affiliation | E-mail | | LU Chuang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | PANG Huan-cheng | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | ZHANG Jian-li | School of Life Science, Beijing Institute of Technology, Beijing 100081, China | | | YAN Shou-wei | School of Life Science, Beijing Institute of Technology, Beijing 100081, China | | | WANG Jing | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | LI Yu-yi | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | liyuyi@caas.cn |
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| Abstract: |
| We conducted barrel planting experiment to investigate the leaf protective enzymatic activities, dry matter accumulation, P uptake of sunflower and the variation characteristics of microflora in soils with different levels of P supply. Four P treatments was implemented including CK(0 kg·hm-2), P4(60 kg·hm-2), P8(120 kg·hm-2) and P12(180 kg·hm-2). The results showed that applying P significantly improved sunflower leaf protective enzymatic activities, and the leaf SOD and CAT activities were significantly increased when the P application reached P4 level, further increase at P12 level, but POD activity was significantly increased only when reached P12 level. The leaf MDA content kept pace with SOD activity and it significantly decreased by 31.40% compared with CK only at P12 level. The leaves, seed, root dry matter weight and the roots/shoots ratio of sunflower were significantly higher under P12 than that under other treatments. Meanwhile, the P accumulation in seed and root increased with P supply, also the P contents at shoot and root under all P treatments were significantly higher than that of CK, but no significant differences occurred between P12 and P8. Furthermore,P application was conductive to the P transportation from roots to overground parts. We also found P application significantly increased the quantity of cultivable microorganisms by regulating sunflower root system and improving soil microenvironment, and P12 treatment presented the greatest increase in bacteria, actinomyces and fungus quantity and also showed the most abundant species of dominant microflora with a large number of Arthrobacter at flowering stage and Kocuria, Staphylococcus and Chitinophaga after sunflower harvest.Compared comprehensively, applying P with 180 kg·hm-2 in severe saline land in Hetao Irrigation District can significantly increased the leaf protective enzymatic activities, promoted sunflower growth and P uptake and thus strengthened sunflower stress resistance, in the meantime increased the soil microbial diversity. |
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