作者:
Can CHEN;Huang HUANG;Huabin ZHENG;Guangxiang DENG;Tianxi WANG
期刊:
药用植物研究:英文版,2017年(6):51-55 ISSN:2152-3924
作者机构:
College of Agriculture,Hunan Agricultural University;[Can CHEN; Tianxi WANG; Huabin ZHENG; Huang HUANG; Guangxiang DENG] 湖南农业大学
关键词:
Different populations;Wild Houttuynia cordata Thumb;Underground stem;Tissue structure;Agronomic traits;Comparison;[] Different populations
摘要:
[Objectives] To study the underground stem tissue structure and agronomic traits of different populations of wild Houttuynia cordata Thumb. [Methods] 8 different populations of wild Houttuynia cordata Thumb. in southern China were selected,the preliminary study was carried out about underground stem tissue structure( stem wall thickness,underground stem cross section diameter,medullary cavity,large vascular bundle area,small vascular bundle area,and number of vascular bundles),and main agronomic traits of aboveground and underground parts. [Results]There were significant differences in the underground stem tissue structure and agronomic traits of some populations of wild Houttuynia cordata Thumb. [Conclusions] From comparison,it reached the conclusion that the populations of wild Houttuynia cordata Thumb. in Kunming of Yunnan,Hechuan of Chongqing,and Nanning of Guangxi showed better underground stem tissue structure and agronomic traits. The results are expected to provide certain guidance for cultivation,reasonable development,and utilization of wild populations of Houttuynia cordata Thumb.
关键词:
Carbon structure;Carbon sink function;Crop production;Typical agriculture region
摘要:
Crop production not only creates economic values, but also has ecological functions. The carbon sink function of crops plays an important role in mitigating climate changes. This paper collected and analyzed the carbon cost data of staple crops in China, estimated the carbon sink and carbon source effects of farmlands, and quantitatively evaluated the carbon inputs and outputs of crop production systems. The results showed that the carbon footprints of crops in six typical agriculture regions were quite different, and the major crops production showed as carbon sinks in general. The carbon sequestration of different crops in the same region were significantly different, as well as the same crop in different regions. China's farmland ecosystem showed carbon sequestration effect: the total annual net carbon sink of three major crops, rice, wheat, and corn, was about 165.76 TgC, of which rice was the highest, accounting for 48.71%. This study also proposed the key ways for energy conservation and emission reduction of crop production in every region, and suggested the technology direction for improving carbon sink function. This study provided important basis for policy formulation and planning about the low-carbon agriculture development in China. (C) 2017 Published by Elsevier Ltd.
摘要:
The excessive use of fertilizers and pesticides required by intensified agriculture has caused a significant damage to the environment. However, deploying effective measures to reduce fertilizer and pesticide use without decreasing grain yield has been challenging. This study reviews the history, benefits, and weaknesses of the classical farming technology in China. We explain how using animals to control and reduce pathogens, pests, and weeds is beneficial, and why the rice-fish/rice-duck (RF/RD) system requires less chemical fertilizer and pesticide. Finally, we present a new planting and breeding model to overcome the weakness of the RF/RD with a ridging design to increase water level for fish/duck. This new model could further improve the economic, social, and ecological benefits of classical farming technology. This study suggests that further development of Chinese traditional rice farming method under the context of the modern intensification of agriculture is of high ecological and economic values.
期刊:
Agricultural Water Management,2016年170:20-25 ISSN:0378-3774
通讯作者:
Huang, Huang;Zhang, Canming
作者机构:
[Zheng, Huabin; Li, Jingyi; Huang, Huang] Hunan Agr Univ, Coll Agron, Changsha 410128, Hunan, Peoples R China.;[Zheng, Huabin; Li, Jingyi; Huang, Huang] Collaborat Innovat Ctr Grain & Oil Crop Southern, Changsha 410128, Hunan, Peoples R China.;[Zhang, Canming] Asia Europe Meeting ASEM Water Resources Res & De, Changsha 410013, Hunan, Peoples R China.
通讯机构:
[Huang, Huang] H;[Zhang, Canming] A;Hunan Agr Univ, Coll Agron, Changsha 410128, Hunan, Peoples R China.;Asia Europe Meeting ASEM Water Resources Res & De, Changsha 410013, Hunan, Peoples R China.
摘要:
为给 GAP 管理在临澧地区实施提供理论依据,通过实验室测定大气环境、水质和土壤重金属三大类21个小项指标,对临澧县植烟区大气、水质及土壤等环境因子进行了分析。结果表明:临澧县植烟区的大气质量符合GB3095-1996(大气环境质量标准)一级标准,水体质量达到了国家 GB3838-2002一级标准,绝大多数植烟土壤的质量符合 GB15618-1995一级标准,大气、水质及土壤等环境因子指标完全符合优质烤烟 GAP 生产要求。