首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅与联系  |  微信  |  出版道德声明  |  Ei收录本刊数据  |  封面
水稻光合碳在植株-土壤系统中分配与稳定对施磷的响应
摘要点击 1507  全文点击 539  投稿时间:2018-07-21  修订日期:2018-09-30
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  光合碳  稻田  施磷  13CO2连续标记
英文关键词  photosynthates  paddy soil  phosphorus fertilization  13C-CO2 continuous labeling
作者单位E-mail
王莹莹 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 2391925245@qq.com 
肖谋良 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
张昀 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 33783628@qq.com 
袁红朝 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
祝贞科 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
葛体达 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
吴金水 中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 长沙 410125  
张广才 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866  
高晓丹 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866  
中文摘要
      为探究稻田土壤光合碳的输入及分配对施磷的响应特征,本研究选用籼性常规水稻品种(中早39),在两个施磷(0 mg·kg-1和80 mg·kg-1;分别记为P0和P80)条件下进行盆栽试验,同时采用13CO2连续标记技术量化光合碳在水稻-土壤系统中的分配.结果表明,施磷显著增加光合碳在水稻地上部的分配,降低其在根际土的分配(P<0.05);施磷使拔节期水稻的光合碳含量增加了70%,根系干重降低了31%.与不施磷相比,施磷显著提高了水稻地上部全碳含量0.31 g·pot-1P<0.05),显著降低了水稻根冠比;施磷使进入非根际土壤微生物量的光合碳(13C-MBC)显著增加了0.03 mg·kg-1,但降低其在根际土壤的分配;光合碳在非根际土壤颗粒态有机碳(POC)和矿物结合态有机碳(MOC)的分配对施磷的响应不显著,但在根际土壤施磷处理显著降低了其在POC中的含量.因此,施磷增加了光合碳在水稻-土壤系统的分配,但降低了光合碳在土壤中的积累.本研究探讨施磷对水稻光合碳在水稻-土壤系统的分配及其稳定的影响,为缺磷土壤的合理施用磷肥及其对土壤有机碳积累的影响提供理论基础和数据支撑;对理解稻田土壤光合碳的传输与分配特征及其固碳潜力具有重要意义.
英文摘要
      This research studied the response of the input and allocation of photosynthetic carbon (C) to phosphorus (P) in paddy soils. Two treatments were conducted in this experiment:no P application (P0) and the application of 80 mg·kg-1 of P (P80). The rice cultivar was the indica Zhongzao 39. The 13C-CO2 continuous labeling technique was used to identify the photosynthetic C distribution of the rice. The results showed that the application of P80 significantly increased the photosynthates allocation in the rice aboveground, but reduced their allocation in the rhizosphere soil (P<0.05). At the jointing stage, P80 application increased the photosynthetic C content of the rice by 70%, but the root dry weight decreased 31%. Compared with P0, the total C content of the aboveground rice was increased 0.31 g·pot-1 by P80. The ratio of rice roots to shoots decreased with the P80 treatment. Moreover, P80 application led to an increase in the photosynthetic microbial biomass in the non-rhizosphere soil C (13C-MBC) of 0.03 mg·kg-1, but still decreased its allocation in the rhizosphere soil. The allocation of photosynthetic C to the particulate organic matter fraction (POC) and mineral fraction (MOC) in the non-rhizosphere soil showed no significant differences between P0 and P80. Additionally, the P80 fertilization treatment significantly lowered the content of POC in the rhizosphere soil. In summary, P application increased the allocation of photosynthetic C in the soil-rice system, but reduced the accumulation of photosynthetic C in the soil. This research provided a theoretical basis and data supporting the rational application of P fertilizer, and was also of great significance as a study of the transportation and allocation of photosynthetic C and its sequestration potential response to the application of P to the rice soil.

您是第51717462位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2