水稻分蘖期旱涝交替胁迫对干物质累积及氮素吸收的影响

Study on Dry Matter Accumulation and Nitrogen Uptake under Alternating Drought and Flooding Stress in Rice Tillering Stage

通过盆栽试验,研究了水稻分蘖期旱涝交替胁迫对各器官氮素的吸收、分配与转化效率以及光合同化物累积的影响。结果表明,旱涝交替胁迫结束后,HD和LD处理根、茎、叶干物质累积量与氮素累积量均极显着低于CK(P<0.01)。分蘖期末(旱涝交替胁迫结束)—拔节抽穗期,HD和LD处理根、茎干物质累积速率较CK显著增大(P<0.01),而HD处理和CK的叶干物质累积速率却极显著高于LD处理(P<0.01)。拔节抽穗期—黄熟期,CK穗干物质量、氮素质量分数、粗蛋白以及氮素利用效率显著高于LD和HD处理(P<0.05),但HD和LD处理叶片氮素表观转移率较CK却分别提高了15.47%和12.31%,且HD和LD处理穗质量占冠质量的比例较CK分别提高了10.74%和10.28%。

Through the pot experiments,the dry biomass of rice assimilation rules,nitrogen transfer and nitrogen use efficiency of different organs in rice tillering stage were studied under LD treatment（alternative slight drought and slight flood）and HD treatment（alternative heavy drought and slight flood）,with shallow water irrigation as control（CK）.The results indicated that the accumulation amounts of dry biomass as well as nitrogen under the treatments of HD and LD were significantly lower than those of CK（P〈0.01）.From tillering final to jointing-heading stage,the growth accumulation rates under different irrigation regimes differed with organs：accumulation rate of root in HD treatment had the highest value,followed by LD treatment,and the lowest value appeared in CK.For the accumulation rate of stem,there was no significant difference between HD and LD treatments,but both of them were significantly lower than that of CK（P〈0.01）.For the accumulation rate of leaf,there was no significant difference between HD treatment and CK,but both of them were significantly higher than that of CK（P〈0.01）.From jointing-heading stage to ripening stage,the apparent nitrogen transfer rates of leaf in HD and LD treatments were significantly higher 15.47% and 12.31%t than that of CK（P〈0.05）.The accumulation amounts of panicle dry biomass,nitrogen content crude protein content as well as nitrogen use efficiency under treatments of HD and LD were significantly lower than those of CK（P〈0.05）,while the ratios of panicle to shoot in HD and LD treatments were significantly higher 10.74%and 10.28%than those of CK（P〈0.05）.