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Carbon and Nitrogen Footprints of Major Cereal crop Production in China:A Study Based on Farm Management Surveys

Rice science 2022年第3期29卷 288-298页

作者： XU Chunchun CHEN Zhongdu JI Long LU Jianfei College of Agriculture Yangzhou UniversityYangzhou 225009China China National Rice Research Institute Hangzhou 310006China

Greenhouse gas(GHG)emissions and reactive nitrogen(Nr)releases are central environmental problems,which are closely linked to climate change,environmental ecology and crop *** development of agriculture plays an important role in GHG emissions and Nr *** life cycle assessment(LCA)method was used to calculate the product and farm carbon footprints(CFs)and nitrogen footprints(NFs)in rice,wheat and maize production in China based on farm survey *** results pinpointed that the CFs of rice,wheat and maize were 0.87,0.30 and 0.24 kg/***,the computed NFs were 17.11,14.26 and 6.83 g/kg,*** nitrogen fertilizer applications and methane(CH4)emissions were dominant CF sources,while ammonia(NH3)volatilization was the main NF ***,significant decreases in CF and NF by 20%–54%and 33%–61%,respectively,were found in large-size farms(>20 hm^(2))when compared to small-size farms(crop production in China,especially optimizing fertilizer use and farm machinery operation efficiencies,as well as developing large-size farms with intensive farming.

关键词： carbon footprint nitrogen footprint life cycle assessment grain crop sustainability

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The supporting capability of Water and land resources for sustainable increase of yield in North China Plain

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Journal of Geographical Sciences 1998年第2期8卷 80-85页

作者： ZHANG HongyeInstitute of Geography, CAS, Beijing 100101 CHINA

The potential of yield increase in the North China Plain is about 30 billion kg by ameliorating the low yield and medium low yield farmlands and 4 billion kg by reclaiming unused land. Water shortage will be the main limitation to the further increase of grain crop yield. The amount of water shortage is 8 200 million m3 at present, and will be 17 720 million m3 in 2 000. Yield increase can not be realized by using more water in the future. Other factors such as decrease of the area of cultivated land and the grain crop growing area, deterioration of environment and destruction of resources will also affect the development of grain production. Some suggestions have been proposed in the paper for attaining sustainable increase of yield in the plain.

关键词： North China Plain yield increase grain crop water and land resources

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