{"title":"水分对中国西北棉田土壤 CO2 逸出量的影响","authors":"Zhimin Zhao, Fengxia Shi","doi":"10.1134/s1064229323603542","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In order to explore the effect of moisture on soil CO<sub>2</sub> effluxes in a Cotton field in Northwestern China, soil profile CO<sub>2</sub> concentration, soil profile temperature and moisture at depths 5, 10 and 15 cm were measured simultaneously. Based on the models of Fick first law of diffusion, Moldrup model, gas transport equation, van’t Hoffequation, exponential equation and quadratic function equation, the effects of soil moisture and temperature on soil CO<sub>2</sub> efflux (<i>F</i><sub>(0)</sub>) was determined. The results were as following: (1) <i>F</i><sub>(0)</sub> has an optimal soil moisture, and the optimal moisture of <i>F</i><sub>(0)</sub> is close to the field capacity (FC). In this study, the field capacity (FC) was close to 0.278 m<sup>3</sup>/m<sup>3</sup>. When the values of soil moisture were higher than the optimal soil moisture values of <i>F</i><sub>(0)</sub>, soil moisture is the main limiting factor for <i>F</i><sub>(0)</sub>, and <i>F</i><sub>(0)</sub> is negatively correlated with soil moisture at soil moisture value >0.278 m<sup>3</sup>/m<sup>3</sup> (FC). However, the values of <i>F</i><sub>(0)</sub> increased with the increase of soil moisture when the values of soil moisture were lower than the optimal soil moisture values of <i>F</i><sub>(0)</sub>. (2) Soil moisture affected the temperature responses of <i>F</i><sub>(0)</sub> by a clear threshold inflection point, which significantly influence the temperature sensitivity of <i>F</i><sub>(0)</sub>. We concluded that the scale of changes in soil moisture is significant to <i>F</i><sub>(0)</sub>. These factors should be incorporated into models to improve the prediction of carbon-climate feedbacks.</p>","PeriodicalId":11892,"journal":{"name":"Eurasian Soil Science","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of Moisture on Soil CO2 Efflux in a Cotton Field in Northwestern China\",\"authors\":\"Zhimin Zhao, Fengxia Shi\",\"doi\":\"10.1134/s1064229323603542\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Abstract</h3><p>In order to explore the effect of moisture on soil CO<sub>2</sub> effluxes in a Cotton field in Northwestern China, soil profile CO<sub>2</sub> concentration, soil profile temperature and moisture at depths 5, 10 and 15 cm were measured simultaneously. Based on the models of Fick first law of diffusion, Moldrup model, gas transport equation, van’t Hoffequation, exponential equation and quadratic function equation, the effects of soil moisture and temperature on soil CO<sub>2</sub> efflux (<i>F</i><sub>(0)</sub>) was determined. The results were as following: (1) <i>F</i><sub>(0)</sub> has an optimal soil moisture, and the optimal moisture of <i>F</i><sub>(0)</sub> is close to the field capacity (FC). In this study, the field capacity (FC) was close to 0.278 m<sup>3</sup>/m<sup>3</sup>. When the values of soil moisture were higher than the optimal soil moisture values of <i>F</i><sub>(0)</sub>, soil moisture is the main limiting factor for <i>F</i><sub>(0)</sub>, and <i>F</i><sub>(0)</sub> is negatively correlated with soil moisture at soil moisture value >0.278 m<sup>3</sup>/m<sup>3</sup> (FC). However, the values of <i>F</i><sub>(0)</sub> increased with the increase of soil moisture when the values of soil moisture were lower than the optimal soil moisture values of <i>F</i><sub>(0)</sub>. (2) Soil moisture affected the temperature responses of <i>F</i><sub>(0)</sub> by a clear threshold inflection point, which significantly influence the temperature sensitivity of <i>F</i><sub>(0)</sub>. We concluded that the scale of changes in soil moisture is significant to <i>F</i><sub>(0)</sub>. These factors should be incorporated into models to improve the prediction of carbon-climate feedbacks.</p>\",\"PeriodicalId\":11892,\"journal\":{\"name\":\"Eurasian Soil Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":1.4000,\"publicationDate\":\"2024-04-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Eurasian Soil Science\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1134/s1064229323603542\",\"RegionNum\":4,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"SOIL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Eurasian Soil Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1134/s1064229323603542","RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"SOIL SCIENCE","Score":null,"Total":0}
Effects of Moisture on Soil CO2 Efflux in a Cotton Field in Northwestern China
Abstract
In order to explore the effect of moisture on soil CO2 effluxes in a Cotton field in Northwestern China, soil profile CO2 concentration, soil profile temperature and moisture at depths 5, 10 and 15 cm were measured simultaneously. Based on the models of Fick first law of diffusion, Moldrup model, gas transport equation, van’t Hoffequation, exponential equation and quadratic function equation, the effects of soil moisture and temperature on soil CO2 efflux (F(0)) was determined. The results were as following: (1) F(0) has an optimal soil moisture, and the optimal moisture of F(0) is close to the field capacity (FC). In this study, the field capacity (FC) was close to 0.278 m3/m3. When the values of soil moisture were higher than the optimal soil moisture values of F(0), soil moisture is the main limiting factor for F(0), and F(0) is negatively correlated with soil moisture at soil moisture value >0.278 m3/m3 (FC). However, the values of F(0) increased with the increase of soil moisture when the values of soil moisture were lower than the optimal soil moisture values of F(0). (2) Soil moisture affected the temperature responses of F(0) by a clear threshold inflection point, which significantly influence the temperature sensitivity of F(0). We concluded that the scale of changes in soil moisture is significant to F(0). These factors should be incorporated into models to improve the prediction of carbon-climate feedbacks.
期刊介绍：
Eurasian Soil Science publishes original research papers on global and regional studies discussing both theoretical and experimental problems of genesis, geography, physics, chemistry, biology, fertility, management, conservation, and remediation of soils. Special sections are devoted to current news in the life of the International and Russian soil science societies and to the history of soil sciences.
Since 2000, the journal Agricultural Chemistry, the English version of the journal of the Russian Academy of Sciences Agrokhimiya, has been merged into the journal Eurasian Soil Science and is no longer published as a separate title.
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