李伏生, 康绍忠, 张富仓. CO2浓度升高、氮与土壤水分对春小麦生长及干物质积累的效应[J]. 中国生态农业学报(中英文), 2003, 11(2): 37-40.
引用本文: 李伏生, 康绍忠, 张富仓. CO2浓度升高、氮与土壤水分对春小麦生长及干物质积累的效应[J]. 中国生态农业学报(中英文), 2003, 11(2): 37-40.
LI Fu-Sheng, KANG Shao-Zhong, ZHANG Fu-Cang. Effects of CO2 enrichment,nitrogen and soil moisture on growth and dry matter ccumulation of spring wheat[J]. Chinese Journal of Eco-Agriculture, 2003, 11(2): 37-40.
Citation: LI Fu-Sheng, KANG Shao-Zhong, ZHANG Fu-Cang. Effects of CO2 enrichment,nitrogen and soil moisture on growth and dry matter ccumulation of spring wheat[J]. Chinese Journal of Eco-Agriculture, 2003, 11(2): 37-40.

CO2浓度升高、氮与土壤水分对春小麦生长及干物质积累的效应

Effects of CO2 enrichment,nitrogen and soil moisture on growth and dry matter ccumulation of spring wheat

  • 摘要: 大型人工气候室条件下进行了350umol/mol和700umol/mol 2种CO2浓度,湿润及干旱2种水分处理和0mg/kg±、50mg/kg±、100mg/kg±、150mg/kg±和200mg/kg±5种N肥施用量试验结果表明,高C02浓度下春小麦分蘖并未增加,低N时分蘖明显降低,因而高CO2浓度下春小麦分蘖必须补充足够N 素。CO2浓度增高下播后55d施用N 肥,春小麦叶宽、叶面积指数均增加,而不施N 肥叶宽、叶面积指数未增加。充足N 肥和水分有利于促进春小麦叶片生长,明显提高叶面积和分蘖。C02浓度增高,春小麦地上部干物质量增加与N 肥施用量有关,中N和高N处理地上部干物质量明显增加,而不施N和低N 时则增加不明显。干旱条件且高C02浓度下地上部干物质量增幅低于湿润条件,因而CO2浓度升高对N 素和水分胁迫无明显补偿作用。且CO2浓度升高其根干物质量和根冠比未增加,相反湿润条件下不施N 处理根干物质量略有降低,而根冠比明显降低。

     

    Abstract: Spring wheat(Triticum aestivum L.CV.Dingxi No.8654)is treated with the concentrations of 350umol/mol and 700umaol/mol of atmospheric C02 at two levels of soil moisture(wet and drought)and five levels of nitrogen fertilizer(0mg/kgsoil,50mg/kgsoil,100mg/kg soil,150mg/kgsoil and 200mg/kgsoil).The study shows that C02 concentration enrichment does not increase the tillers of spring wheat,while in low N treatment,tillers are reduced significantly.The results indicate that tillering of spring wheat needs enough N nutrition under atmospheric CO2 concentration enrichment.At 55 days after sowing,the elevated C02 increases the leaf width and leaf area index(LAf)with N-added treatment but does not show any increase of those without N-added treatment. Adequate N and water can hasten the leaf growth and increase the leaf area and tiller.The effects of enriched 0 concentration on shoot dry mass depend on soil nitrogen leve1.In the medium N and high N trea tments,shoot dry mass increases significa ntly,but does not increase sign ificantly in the low N trea tment.CO2 concentration enrichment does not increase more shoot dry mass in drought treatment than in wet treatment.Thus,the elevated C02 does not ameliorate the depressive effects of drought and nitrogen stres.In addition,the elevated C02 concentration does not increase root dry mas and root/shoot ratio,on the other hand,root dry mas decreases slightly and root/shoot ratio decreases significantly owing to CO2 enrichment without N-added treatment under wet condition.

     

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