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Characterization of soil low-molecular-weight organic acids in the Karst rocky desertification region

Xiaoliang LI, Xiaomin CHEN, Xia LIU, Lianchuan ZHOU, Xinqiang YANG

《环境科学与工程前沿（英文）》 2012年第6卷第2期页码 195-203 doi: 10.1007/s11783-012-0391-1

摘要： Soil low-molecular-weight (LMW) organic acids play important roles in the soil-forming process and the cycling of nutrients in Karst regions. In this study, we quantified the contents of LMW organic acids (including lactate, acetate, formate, malate, and oxalate) in soil solution over the Karst region of Guizhou Province, China using ion chromatography. The concentration of total LMW organic acids in topsoil solution ranged from 0.358 to 1.823 μmol·g , with an average of 0.912 μmol·g . The mean concentrations of lactate, acetate, formate, malate, and oxalate were 0.212±0.089, 0.302±0.228, 0.301±0.214, 0.014±0.018 and 0.086±0.118 μmol·g , respectively. There were also significant difference in the contents of these acids among four phases of rocky desertification, and their concentrations decreased with the aggravation of rocky desertification. The concentrations of the LMW organic acids were significantly positive correlated each other. Significant positive correlations were also observed among individual LMW organic acids in soil solution, and between them and soil available P, available K, exchangeable Ca, respectively. Furthermore, the concentrations of LMW organic acids were significantly positively correlated with inorganic anions (chlorides, nitrates, and sulfates) in Karst topsoil solution. Therefore, the concentrations of soil LMW organic acids might be one of driving force in the Karst rock desertification process in Guizhou Province.

关键词： Karst rocky desertification low-molecular-weight (LMW) organic acids distribution characteristics soil

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Desertification: China provides a solution to a global challenge

Yingshuang BAO, Leilei CHENG, Yanfeng BAO, Liu YANG, Lina JIANG, Chao LONG, Zhe KONG, Peng PENG, Jun XIAO, Qi LU

《农业科学与工程前沿（英文）》 2017年第4卷第4期页码 402-413 doi: 10.15302/J-FASE-2017187

摘要： Desertification has been caused by various factors and is a major environmental problem and development bottleneck faced by the world. It is also a serious threat to ecological security and to sustainable economic and social development. As a stubborn world problem, focused on by the United Nations 2030 sustainable development goal 15.3, China aims to combat desertification by implementing the “eight-column four-beam” strategy, and also suggest the “four-medicine” approach for global desertification governance. This includes the development of the United Nations Convention to Combat Desertification protocol, unified global compliance and compliance metrics; building a global observation network, and monitoring land changes based on remote sense; preparing the global natural desert (heritage) list, leaving the original deserts for future generations; initiating the global action of combating desertification, and striving to achieve a land degradation-neutral world by 2030.

关键词： desertification global governance land degradation neutrality LDN origin status strategy sustainable development

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Driving mechanisms of desertification process in the Horqin Sandy Land-a case study in Zhalute Banner

TANG Haiping, CHEN Yufu, LI Xinyu

《环境科学与工程前沿（英文）》 2008年第2卷第4期页码 487-493 doi: 10.1007/s11783-008-0061-5

摘要： Both natural and human factors contributing to desertification were examined to understand the driving mechanisms of the desertification process in Zhalute Banner, Inner Mongolia of China. The coefficient of variation () and climate departure index () were calculated to examine the fluctuations and trends of inter-annual variations of temperature and precipitation; TM remote sensing data was extracted to obtain the sandy land area; linear regression analysis was used to analyze climate changes and the socio-economic evolution over the years, and it was also used to standardize the variables, which included annual temperature, annual precipitation, human population, and livestock number, in order to measure the difference in the rate of change between climate and anthropogenic factors. The results showed that there was a rise of about 1.6°C in temperature but no significant change in precipitation from 1961 to 2000, which indicated a short-term climatic trend toward aridity in this area, a condition necessary for desertification. The fraction of precipitation in spring tended to increase whilst the fraction in autumn and winter decreased. Both the human population and livestock population had tripled and the cultivated area had doubled from 1961 to 2000, suggesting that socio-economic factors might have contributed more significantly to the desertification. Between 1988 and 1997, the sandy land area increased by 12.5%, nearly 2.4 times in the farming section. It could be concluded that the driving mechanisms of the desertification processes in Zhalute banner are mainly the policy of cropland expansion and the rising populations of humans and their livestock, which has affected the land use pattern in the past decades.

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沙漠“土壤化”：沙漠化的生态力学解决方法

易志坚, 赵朝华

《工程（英文）》 2016年第2卷第3期页码 270-273 doi: 10.1016/J.ENG.2016.03.002

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民勤绿洲水资源利用的历史现状和未来

孙雪涛

《中国工程科学》 2004年第6卷第1期页码 1-9

摘要：

石羊河流域下游的民勤绿洲面临严重的生态危机，如何抢救和保护民勤绿洲，引起了社会各界的广泛关注。文章通过对民勤绿洲历史演变和开发过程的研究，分析了民勤绿洲水资源利用的现实状况和未来发展情景。结合计算初步认为：石羊河水资源开发利用过度，目前已经基本丧失其河流的生态功能，民勤绿洲的水资源已无法维持绿洲的生存和发展。针对当前情况，提出了治理石羊河、抢救民勤绿洲，争取适当恢复青土湖的三个步骤。

关键词：民勤绿洲生态环境荒漠化水资源结构调整