| Cite this article: | 杜兵杰,曹红霞,裴书瑶,等.亏缺灌溉下温室番茄生长生理指标对生物炭的响应[J].灌溉排水学报,0,():-. |
| Du Bingjie,CAO Hongxia,PEI Shuyao,et al.亏缺灌溉下温室番茄生长生理指标对生物炭的响应[J].灌溉排水学报,0,():-. |
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| Responses of growth and physiological indexes of greenhouse tomato to biochar under deficit irrigation |
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Du Bingjie1,2, CAO Hongxia1,2, PEI Shuyao1,2, ZHANG Zeyu1,2, LI Manning1,2
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1.Northwest A &2.F University
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| Abstract: |
| Abstract: 【Objective】The objectives of this study were to explore the effects of biochar and deficit irrigation on growth, physiological indexes and water use efficiency of tomato, so as to provide the management basis for irrigation and biochar application of greenhouse tomato in northwest China. 【Method】Three irrigation levels (full irrigation I1: 75%~85% θf , medium water deficit I2: 55%~65% θf, and severe water deficit I3: 40%~50% θf ) and three biochar application rates (B0: 0, B1: 3%, B2: 6%) were set to study the effects of different irrigation levels and biochar application rates on growth and physiological indexes, final shoot dry matter and long-term water use efficiency of tomato at different growth stages. 【Result】The results showed that proper deficit irrigation did not affect the photosynthetic capacity of tomato plants at the critical growth stage, and significantly increased the activities of antioxidant enzymes (SOD, POD, CAT) in leaves, but the final shoot dry matter was significantly reduced; Under full irrigation, biochar application had a negative effect on photosynthesis and reduced the open ratio (qP) of photosystem II (PSⅡ), resulting in a significant decrease in shoot dry matter and long-term water use efficiency (WUEL); However, the openness of PSⅡ system and plant heat dissipation capacity (NPQ) of biochar with B2 application rate under deficit irrigation were all increased at the critical growth stage, thus increasing the shoot dry matter and WUEL. In the critical period of shoot dry matter accumulation, all the monitoring physiological indexes had significant effects on shoot dry matter, among them, antioxidant enzyme activities (POD and CAT) and net photosynthetic rate (Pn) and stomatal conductance (Gs) had the greatest comprehensive effect on shoot dry matter. Improving the photosynthetic capacity of leaves and the defense capacity of antioxidant system could promote the dry matter accumulation. 【Conclusion】Compared with I2B0 (55%~65% θf , no biochar application), the shoot dry matter and WUEL of I2B2 treatment (55%~65% θf ,6% biochar application) were increased by 6.1% (P>0.05) and 30.9% (P<0.05), respectively. It can be used as a suitable combination of irrigation and biochar application in the areas where full irrigation is not available for tomato cultivation in northwest China. |
| Key words: deficit irrigation; biochar; photosynthesis characteristics; antioxidant enzyme activity；shoot dry matter; WUEL |
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