{"title":"Carbon sink in cropland soils and the emission of greenhouse gases from paddy soils: a review of work in China","authors":"Guo Liping, Lin Erda","doi":"10.1016/S1465-9972(01)00019-8","DOIUrl":null,"url":null,"abstract":"<div><p>This paper discusses the dual contribution of rice paddy soils to atmospheric greenhouse effect. On one hand, the paddy soils store more organic carbon than the upland soils by 12–58% in China. The amount of organic carbon stored in paddy soils increased by 120.8–584.0 Tg (Teragram=<span><math><mtext>10</mtext><msup><mi></mi><mn>12</mn></msup><mspace></mspace><mtext>g</mtext></math></span>) in 0–100 cm soil depths due to the conversion of upland soils to paddy soils in the past 600 years in China. On the other hand, the paddy soils are another important source of atmospheric CH<sub>4</sub>. Among the factors governing the CH<sub>4</sub> emission, the water regime was mainly reviewed in this paper. Mid-season aeration is one of the means to mitigate the CH<sub>4</sub> emission and also contribute to the higher rice yield. However N<sub>2</sub>O emission does occur during the drainage period, and its global warming potential (GWP) is higher in long term. Therefore, it is important to properly control the water regimes and judiciously use nitrogen fertilizers in paddy soils in order to maximize its sinks and minimize its sources of atmospheric greenhouse gases (GHGs).</p></div>","PeriodicalId":100235,"journal":{"name":"Chemosphere - Global Change Science","volume":"3 4","pages":"Pages 413-418"},"PeriodicalIF":0.0000,"publicationDate":"2001-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1465-9972(01)00019-8","citationCount":"77","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemosphere - Global Change Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1465997201000198","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 77
Abstract
This paper discusses the dual contribution of rice paddy soils to atmospheric greenhouse effect. On one hand, the paddy soils store more organic carbon than the upland soils by 12–58% in China. The amount of organic carbon stored in paddy soils increased by 120.8–584.0 Tg (Teragram=) in 0–100 cm soil depths due to the conversion of upland soils to paddy soils in the past 600 years in China. On the other hand, the paddy soils are another important source of atmospheric CH4. Among the factors governing the CH4 emission, the water regime was mainly reviewed in this paper. Mid-season aeration is one of the means to mitigate the CH4 emission and also contribute to the higher rice yield. However N2O emission does occur during the drainage period, and its global warming potential (GWP) is higher in long term. Therefore, it is important to properly control the water regimes and judiciously use nitrogen fertilizers in paddy soils in order to maximize its sinks and minimize its sources of atmospheric greenhouse gases (GHGs).