摘要
依托40年长期定位试验研究平台,采用^(13)CO_(2)脉冲标记方法对4种不同施肥方式下光合碳在甘薯-土壤系统中的分配进行了定量研究。结果表明:施肥能显著增加甘薯植株各器官的生物量与干物质量,以有机无机配施处理增加幅度最为显著。甘薯-土壤系统光合固定碳转移较快,且分配差异较大,其^(13)C丰度在脉冲标记1 d后表现为:叶片、叶柄>藤蔓、块根>土体,且不施肥处理地上部^(13)C丰度显著高于施肥处理。脉冲标记30 d后,甘薯植株各器官^(13)C丰度降低,其中在地上部分配比例为19.38%~31.44%,块根中为60.19%~71.86%,而土体^(13)C丰度却略有升高,分配比例为8.05%~11.11%;与不施肥处理相比,施肥处理显著增加块根中^(13)C含量,且MNPK处理块根中^(13)C含量显著高于NPK和M处理,表明在甘薯膨大期施肥处理有利于光合碳在块根中累积,其中以有机无机配施累积效果更为显著。
The ^(13)CO_(2) pulse labeling technique was used to trace ^(13)C in sweetpotato cropping system and evaluate the effects of 4 fertilization modes(CK:no fertilization,NPK:combined application of N,P and K fertilizer,M:organic fertilizer,MNPK:combination of N,P,K and organic fertilizer)on the distribution of photosynthetic carbon based on 40-year long-term fertilization experiment in Xuzhou of Jiangsu Province.The results showed that fertilizer application significantly increased the biomass and dry matter weight of sweetpotato,and the increasing range of MNPK treatment was higher than that of other fertilization treatments.The carbon was quickly translocated and unevenly distributed in the sweetpotato cropping system on D1(the first day after labeling),following the order of leaf,petiole>stem,root>bulk soil,and theδ^(13)C value in the aboveground parts under no fertilization was significantly higher than that under fertilization.Theδ^(13)C value in various sweetpotato plant organs decreased from D1 to D30(the 30th day after labeling),with the distribution ratio ranged from 19.38%to 31.44%in the aboveground parts,and from 60.19%to 71.86%in roots;while theδ^(13)C value in bulk soil increased slightly after labeling,with the distribution ratio ranged from 8.05%to 11.11%.Fertilizer application significantly increased the content of ^(13)C in the roots compared with no fertilization.And the content of ^(13)C in roots under MNPK treatment was significantly higher than that under NPK and M treatments,indicating that fertilizer application during the expansion stage of sweetpotato was beneficial to the accumulation of photosynthetic carbon in roots,and the combined application of organic and inorganic fertilizers had significant cumulative effect.
作者
魏猛
赵鹏
贾志航
蒋薇
张佳
唐忠厚
张爱君
WEI Meng;ZHAO Peng;JIA Zhihang;JIANG Wei;ZHANG Jia;TANG Zhonghou;ZHANG Aijun(Xuzhou Sweetpotato Research Center of Jiangsu Province/Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province,Xuzhou,Jiangsu 221131)
出处
《中国农学通报》
2023年第15期85-91,共7页
Chinese Agricultural Science Bulletin
基金
江苏省自然科学基金项目(BK20191151)。
关键词
长期施肥
甘薯
^(13)C标记
光合碳
分配
long-term fertilization
sweetpotato
^(13)C labeling
photosynthetic carbon
distribution
