The Greenhouse Effect, The Carbon Sink Effect And Cost-benefit Assessments Of The Taihu Lake Basin Rice Cultivation System

Since the1980s, the greenhouse gas emission reduction has become a major environmental issues of concern by governments and scientists around the world. Climate warming was mainly due to human-induced greenhouse gas emissions, as agricultural emissions account for about20%. With the second-largest area and highest production in the world, China’s rice cultivation occupies a important position in the global emissions of greenhouse gases and carbon sequestration.The paper studied the Taihu Lake Basin rice cultivation system and its influence on the greenhouse effect, the carbon sink effect and cost-benefit especially, with accounting of the greenhouse gas emission, carbon stock of rice life period. Literature research and analysis, field research, life cycle analysis, scenario analysis are mainly used in this study. The primary contents are as following:(1) Planting, fertilizing, ploughing, watering, and Maize straw returning make up rice planting life cycle processes. Based on local data in Taihu area,8kinds of common rice planting patterns’GHG emission inventory data was built. Finally, we can found that pattern7exhaust the least greenhouse gas emissions, with Rape-rice cropping, pig manure and conventional fertilizer, No-tillage, mixing straw incorporation. (2) Accounting for carbon sequestration of rice cultivation system in Taihu basin proves that fertilization method was a predominant influence on the carbon sink effect, and pig manure and conventional fertilizer combined with higher carbon sequestration.(3) Rice net income are related to rice yield, sales prices, input costs, the economic value of the greenhouse effect and carbon sink effect, Rice net income in Taihu basin was calculated after the economic value conversion of the greenhouse effect and the carbon sink effect. With rape-rice cropping, pig manure and conventional fertilizer, rotary tilling, mixing straw incorporation, Pattern8gains the greatest payouts.(4) Comparative analysis of the greenhouse effect and the carbon sink effect in the rice life cycle processes shows the least greenhouse gas emissions scenarios are as follows:ryegrass-rice cropping, pig manure and conventional fertilizer, no-tillage, intermittent irrigation, no straw returning. But considering the benign circulation of agriculture ecosystem, mixing straw incorporation should be adopted. With different fertilization in carbon sinks, the organic fertilizer is significantly higher than the no fertilizer and fertilizer treatment, while NF and CF are similar, and so do CFM, CFS organic manure.(5)Based on the above results, suggestions are contributed to provide a reference for the Taihu Lake Basin rice cultivation in the future.