| Effects of invasion of Conyzacanadensis on soil organic carbon in Grassland of Yili Valley |
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| DOI：10.7606/j.issn.1000-7601.2020.02.16 |
| Key Words: Conyzacanadensis invasion soil organic carbon soil bulk density soil moisture content grassland in Yili valley |
| Author Name | Affiliation | | DU Tian | University and College Key Lab of Natural Product Chemistry and Application in Xinjiang，Yili Normal University，Yining，Xinjiang 835000, China
College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China | | CUI Dong | University and College Key Lab of Natural Product Chemistry and Application in Xinjiang，Yili Normal University，Yining，Xinjiang 835000, China
College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China
State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences, Urumqi，Xinjiang 830011,China | | ZHANG Yulu | University and College Key Lab of Natural Product Chemistry and Application in Xinjiang，Yili Normal University，Yining，Xinjiang 835000, China
College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China | | SHA Wuli | College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China | | LIU Haijun | College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China | | YAN Yunjie | College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China | | CHEN Chen | College of Biology and Geography, Yili Normal University, Yining，Xinjiang 835000,China
Institute of Resources and Ecology, Yili Normal University, Yining，Xinjiang 835000,China |
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| Abstract: |
| In order to reveal the invasion mechanism of the Conyzacanadensis, and explore its influence on grassland ecosystem in Yili Valley, the evolution of soil organic carbon(SOC) in the rhizosphere of Conyzacanadensis with different invasion degree(mild, moderate, severe) and the local plant of Artemisia scoparia Waldst were analyzed. The results showed that the soil SOC content increased with the deepening of the invasion of Conyzacanadensis: the severe, moderate, and the mild invasion of Conyzacanadensis, and the average soil values of Artemisia scoparia Waldst were 16.70,11.31,9.56，8.23 g·kg-1. It is indicated that the invasion of Conyzacanadensis increased soil SOC content. With the deepening of the invasion, the ability to increase soil SOC was more obvious.At the same time, the carbon sink function of the grassland soil in the Yili River Valley increased. From the vertical distribution profile, the soil SOC content of the four communities changed uniformly: it decreased with the increase in soil depth, and the maximum soil SOC values all appeared in the 0~20 cm soil layer. The severe invasion of Conyzacanadensis, the moderate invasion of Conyzacanadensis, the mild invasion of Conyzacanadensis, and the maximumsoil SOC values of Artemisia scoparia Waldst were 20.3, 15.0, 13.2 g·kg-1 and 11.5 g·kg-1. The severe invasion of Conyzacanadensis, the moderate invasion of Conyzacanadensis, the mild invasion of Conyzacanadensis, and soil bulk density values of Artemisia scoparia Waldst were 5.02, 4.94, 4.85 g·kg-3 and 5.09 g·kg-3. The average values of soil water content were 1.22%,1.20%,1.19%, and 1.24%. It showed that the invasion of Conyzacanadensis changed the physical properties of the soil in the Yili River Valley. As the invasion of Conyzacanadensis was deepened, the soil bulk density and water content were continuously reduced. There was a very significant positive correlation between water content, soil water content, and soil bulk density (P<0.01). Based on the analysis of soil SOC, it was found that the effects of soil bulk density and water content on soil SOC were consistent, and all showed extremely significant negative correlations (P<0.01). |
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