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Soil water repellency and influencing factors of Nitraria tangutorun nebkhas at different succession stages 被引量:11
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作者 HaoTian YANG XinRong LI +3 位作者 LiChao LIU YanHong GAO Gang LI rongliang jia 《Journal of Arid Land》 SCIE CSCD 2014年第3期300-310,共11页
Abstract: Soil water repellency (WR) is an important physical characteristic of soil surface. It is capable of largely influencing the hydrological and geomorphological processes of soil, as well as affecting the e... Abstract: Soil water repellency (WR) is an important physical characteristic of soil surface. It is capable of largely influencing the hydrological and geomorphological processes of soil, as well as affecting the ecological processes of plants, such as growth and seed germination, and has thus been a hot topic in recent research around the world. In this paper, the capillary rise method was used to study the soil WR characteristics of Nitraria tangutorun nebkhas. Soil water repellencies at different succession stages of Nitraria tangutorun were investigated, and the relationships between soil WR and soil organic matter, total N, and total P, soil texture, pH, and concentrations of CO32, HCO3-, CI, SO42-, Na~, K~, Ca2~ and Mg2+ were discussed. Soil WR may be demonstrated at the following nebkhas dune evolvement stages: extremely degraded〉degraded〉stabilized〉well developed〉newly developed〉quick sand. Apart from some soil at the bottom, the WR of other soils (crest and slope of dune) was found to be largest at the topsoil, and decreased as the soil depth increased. The results showed that multiple factors affected soil WR characteristics e.g. WR increased significantly as the contents of soil organic matter and total N increased, but did not change as the total P content increased. Soil texture was a key factor affecting soil WR; soil WR increased significantly as clay content increased, and decreased significantly as sand content increased. Low pH was shown to be more suitable for the occurrence of soil WR. Four cations (Ca2+, Mg2+, K+ and Na+) and two anions (CI and SO42) enhanced soil WR, while CO32-decreased it. HCO3- did not show any observable effect. Finally, we established a best-fit general linear model (GLM) between soil-air-water contact angle (CA) and influencing factors (CA=5.606 sand+6.496 (clay and silt)-2.353 pH+470.089 CQ2+11.346 Na+-407.707 Cl--14.245 SO42-+0.734 total N-519.521 ). It was concluded that all soils contain subcritical WR (0°〈CA〈90°). The development and succession of Nitraria tangutorun nebkhas may improve the formation of soil subcritical WR. There exist significant relationships between soils subcritical WR and soil physical or chemical properties. 展开更多
关键词 HYDROPHOBICITY soil-air-water contact angle capillary rise method Nitraria tangutorun nebkhas vegetation succession stage
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The effects of extreme rainfall events on carbon release from biological soil crusts covered soil in fixed sand dunes in the Tengger Desert, northern China 被引量:4
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作者 Yang Zhao XinRong Li +3 位作者 ZhiShan Zhang rongliang jia YiGang Hu Peng Zhang 《Research in Cold and Arid Regions》 CSCD 2013年第2期191-196,共6页
In May to August of 2011, we assessed the effects of extreme rainfall (quantity and intensity) events on the carbon release from soils covered by different types of biological soil crusts (BSCs) in fixed sand dune... In May to August of 2011, we assessed the effects of extreme rainfall (quantity and intensity) events on the carbon release from soils covered by different types of biological soil crusts (BSCs) in fixed sand dunes in the Tengger Desert, northern China. A Li-6400-09 Soil Chamber was used to measure the respiration rates of the BSCs immediately after the rainfall stopped, and continued until the respiration rates of the BSCs returned to the pre-rainfall basal rate. Our results showed that almost immediately after extreme rainfall events the respiration rates of algae crust and mixed crust were significantly inhibited, but moss crust was not significantly affected. The respiration rates of algae crust, mixed crust, and moss crust in extreme rainfall quantity and intensity events were, respectively, 0.12 and 0.41 μmolCO2/(m2.s), 0.10 and 0.45 gmolCO2/(m2·s), 0.83 and 1.69 gmolCO2/(m2.s). Our study indicated that moss crust in the advanced succession stage can well adaot to extreme rainfall events in the short term. 展开更多
关键词 carbon release extreme rainfall events biological soil crust
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中国荒漠与沙地生物土壤结皮研究 被引量:57
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作者 李新荣 谭会娟 +4 位作者 回嵘 赵洋 黄磊 贾荣亮 宋光 《科学通报》 EI CAS CSCD 北大核心 2018年第23期2320-2334,共15页
生物土壤结皮广泛分布于干旱半干旱区,其盖度占该区域地表活体覆盖的40%以上,是联结荒漠地表生物与非生物成分的"生态系统工程师"和荒漠/沙地生态系统健康的重要标志,也是干旱区地球表面过程研究中生物学与地球科学交叉研究... 生物土壤结皮广泛分布于干旱半干旱区,其盖度占该区域地表活体覆盖的40%以上,是联结荒漠地表生物与非生物成分的"生态系统工程师"和荒漠/沙地生态系统健康的重要标志,也是干旱区地球表面过程研究中生物学与地球科学交叉研究的热点科学问题.21世纪初,相关研究绝大多数来自国外,且集中在热带荒漠、寒漠和欧洲草原,很少有来自中国和温性荒漠的报道.本文评述了2000年以来中国学者在这一研究领域开展的系列创新性研究,涉及生物土壤结皮组成、分布和演替,对环境胁迫及全球变化的生理生态学响应,与土壤生态、水文过程,与维管植物和土壤动物关系,对干扰响应和人工培养及在生态恢复实践中的应用等,介绍了中国学者对国际生物土壤结皮研究所做的贡献. 展开更多
关键词 荒漠生态系统 生物土壤结皮 土壤生态与水文过程 生态恢复
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