Don’t hesitate to subscribe for the Journal 《Agricultural Archaeology》

Edited and distributed by the Research Centre of Chinese Agricultural Archaeology, Jiangxi Province. Printed by the Agricultural Publishing House in China. General oversea distributor; China International General ook-trad-     

Developing sustainable bioenergy in Northwest China

正This special focus on bioenergy is a product of 2014 and2016 Yangling International Agri-science Forums held at the Northwest AF University(NWAFU),Yangling,Shaanxi,China.The forums brought together scientists over the world to address the challenges and opportunities of developing bioenergy and bio-based economy in China.It was initiated for recognition of China’s     

Don''''t hesitate to subscribe for the Journal Agricultural Archaeology

Edited and distributed by the Research Centre of Chinese AgriculturalArchaeology,Jiangxi Province.Printed by the Agricultural Publishing House in China.General oversea distributor: China International General Book-tradingCorporation.Oversea code. SA624Agricultural Archaeology, the first big journal on agriculturalhistory, publishes articles dealing with studies of achievements in the     

华南热带农业大学国际学院

International College（IC）, founded in 2005, is an integral part of the South China University of Tropical Agriculture （SCUTA）. IC is one of the 12 colleges of SCUTA： College of Agronomy, College of Horticulture, College of Environment and Plant Protection, College of Technology, College of Mechanical Electrics and Information Engineering, College of Economics and Management, College of Humanities and Laws, College of Fundamental Sciences, College of Continued Education, College of Applied Science and Technology.     

Preparation of the UPOV Guidelines for the Conduct of Tests for Distinctness,Uniformity and Stability-Tea Plant [Camellia sinensis （L.） O. Kuntze]

Distinctness, Uniformity and Stability （DUS） testing is the technical base of Plant Variety Protection （PVP） and the scientific basis for the approval of Plant Breeder＇s Rights （PBR）. DUS Test Guidelines are not only the technical manuals for the DUS testing authorities to conduct the testing, but also the technical standards for the competent authorities to examine the DUS of new varieties of plants. Tea plant, originated from Yunnan Province, China, is a very important woody cash species in the world. The International Union for the Protection of New Varieties of Plants （UPOV） DUS Test Guidelines for tea plant is the first Test Guidelines prepared by China for the UPOV. In this article, the subject, selection, and determination of characteristics, states of expression of characteristics and the selection of example varieties, assessment of the UPOV DUS Test Guidelines for tea plant were elucidated in detail. Finally, the proposal of PVP for tea plant in China was also proposed. The preparation of UPOV DUS Test Guidelines for tea plant will have important significance both for promoting the development of PVP and increasing the status of international PVP fields for China.     

The Impact of US and CGIAR Germplasm on Maize Production in China

Wide adoption of a few kinds of homogeneous germplasm would reduce crop genetic diversity, increase crop vulnerability to stresses, and reduce the stability of crop production. The introduction and utilization of foreign germplasm is a sustainable solution for broadening the genetic diversity and promoting periodical replacement of varieties. The genetic contribution and economic impact of foreign germplasm, particularly those of US and CGIAR （Consultative Group on International Agricultural Research, referred to as the CG system） materials, on China＇s maize production are evaluated on the basis of an analysis of variety pedigree information from 20 major maize-producing provinces in China from 1982 to 1997. The results indicated that the contribution of US and CG germplasm to Chinese maize production continues to increase, particularly CG germplasm, which has shown a rapid increasing trend since the 1990s. If the genetic contribution of US germplasm is increased by 1%, maize yield will gain by 0.2% （0.01 t ha^-1）. If contribution of CG germplasm, which has greater production potential, is increased by 1%, maize yield will gain by 0.025 t ha^-1. A policy should be implicated by the government in this direction to encourage breeders to focus more on the use and improvement of CG germplasm. The US germplasm has been utilized extensively in China so that it can offer germplasm resources for maize breeding efforts.     

Impacts of Climate Change on Agriculture and Adaptive Strategies in China

China is the world’s most populous country and a major emitter of greenhouse gases. Consequently, China’s role in climate change has received a great deal of attention, whereas the impact of climate change on China has been largely ignored. Studies on the impacts of climate change on agriculture and adaptation strategies are increasingly becoming major areas of scientific concern. However, the clear warming that has been sounded in China in recent decades has not been matched with a clear assessment of the impact of climate change on China’s water resources and agriculture. In the present study, we review observations on climate change, hydrology, and agriculture in China and relate these observations to likely future changes. We also analyse the adaptive strategies in China’s agriculture.     

Impact of Implementing 1991 Act of the International Convention for the Protection of New Varieties of Plants in China

The Union for the Protection of New Varieties of Plants is abbreviated as UPOV. The Convention for the Protection of New Varieties of Plants has 1961/1972 Act ,1978 Act and 1991 Act. China is member of UPOV and its regulations of protection of new varieties of plants conform to 1978 Act. At present, there is big debate whether China accedes to 1991 Act. This paper mainly discussed advantages and possibilities that China accedes to 1991 Act, and concluded that it is highly desirable that China should consider acceding to 1991 Act in order to contribute to development of system on protection of new varieties of plants.     

nt Water Supplies on Seedling Grow

ute of Mycology,Jilin Agricultural University,Changchun 130118,China;2.College of Chinese Medicinal Material,Jilin Agricultural University, Changchun 130118,China)Growth,biomass and characteristics of stoma apparatus of seedlings of Parthenocissus quinquefolia were studied by observing its response of four