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Distribution of soil organic carbon under different vegetation zones in the ili river valley, Xinjiang

Journal of Geographical Sciences 2010年第5期20卷 729-740页

作者： YANG Yuhai CHEN Yaning LI Weihong CHEN Yapeng Key Laboratory of Oasis Ecology and Desert Environment Xinjiang Institute of Ecology and Geography CASUrumqi 830011 China

We analyzed and estimated the distribution and reserves of soil organic carbon under nine different vegetation conditions including alpine meadow, meadow steppe, typical steppe, desert steppe, and temperate coniferous forest and so on, in the Ill river valley, Xin- jiang according to data from field investigations and laboratory analyses in 2008 and 2009. The study results show that the soil organic carbon content in the ili river valley varies with the type of vegetation. In the 0-50 cm soil horizon, the soil organic carbon content is the highest under the vegetation types of alpine meadow and meadow steppe, slightly lower under temperate coniferous forest and typical steppe, and the lowest under the intrazonal vegetation and desert vegetation types. The soil organic carbon content shows basically a tendency to decrease as soil depth increases under various vegetation types except in the case of the intrazonal vegetation. Similarly, the soil organic carbon density is the highest and varies little under the vegetation types of alpine meadow, meadow steppe and temperate coniferous forest, and is the lowest under the desert vegetation type. Both the soil organic carbon content and density in the topsoil of meadows in the ili river valley are high, so pro- tecting meadows in the ili river valley, and especially their topsoil, should be a priority so that the potential of change in soil organic carbon in the shallow soil horizon is reduced, and this means maintenance of the stability of the soil carbon pool.

关键词： vegetation grassland soil organic carbon ili river valley

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Spatiotemporal characteristics of cultural sites and their driving forces in the ili river valley during historical periods

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Journal of Geographical Sciences 2015年第9期25卷 1089-1108页

作者： WANG Fang YANG Zhaoping LUAN Fuming XIONG Heigang SHI Hui WANG Zhaoguo ZHAO XingYou QIN Wenmin WU Wenjie LI Dong Xinjiang Institute of Ecology and Geography CAS Urumqi 830011 China University of Chinese Academy of Sciences Beijing 100049 China Business School Lishui University Lishui 323000Zhejiang China College of Art and Science Beijing Union University Beijing 100083 China Tourism School Xinjiang University of Finance and-Economics Urumqi 830012 China

This study applies ArcGIS to analyze the spatiotemporal distribution of cultural sites in the Ill river valley in northwestern China. It explores relationships between the sites＇ spatiotemporal evolutionary characteristics, human history, and the natural environment. The results indicate that the numbers and proportions of the sites, and the frequency of their oc- currence, exhibited an inverted V-shaped change trend during six historical periods. The ＂high in the east and low in the west＂ spatial distribution pattern of the first three periods shifted to the one the ＂high in the west and low in the east＂ during the latter three periods, demonstrating a change in the spatial center of gravity of human activities. The sites were mainly distributed on slopes of grades 1-5, with their proportions increasing from 75% during the Spring and Autumn Period （770 BC-476 BC）-Qin Dynasty （221 BC-207 BC） to 93.75% during the Qing Dynasty-Modern period. The concentrated distribution of site elevations shifted from grades 4-8 during the Spring and Autumn Period-Qin Dynasty, and the Western Han （206 BC-8）-Southern and Northern Dynasties （420-589）, to grades 1-4 during the latter three periods. The number of sites showed a shifting trend from high-elevation mountains and hills to low-elevation plains, and from high slopes to low slopes. In particular, the sites exhibited a special ＂moist＂ evolutionary pattern of migration from middle and upstream areas to downstream areas, as opposed to the migration pattern of sites located in typical arid areas. The study also considered factors influencing the distribution and spatiotemporal evolution of cultural sites, notably, human factors and natural factors.

关键词： ili river valley historical periods cultural sites spatiotemporal distribution driving forces

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Threats and Avoidance Measures of Frost Damage of‘Shushanggan’Apricot in the ili river valley

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Asian Agricultural Research 2021年第5期13卷 26-30页

作者： Guizhi CONG Shuying CHEN Yuping MA Jin WANG You SHI Forestry Academy of ili Kazak Autonomous Prefecture Ili 835000 China Meteorological Bureau of ili Kazak Autonomous Prefecture Ili 835000 China

[Objectives]To explore the threat factors of frost damage to‘Shushanggan’Apricot in the ili river valley,and to provide measures for avoiding frost damage.[Methods]Based on the meteorological data of the ili river valley counties and cities during the 12 years from 2010 to 2021 and using the critical low temperature of‘Shushanggan’Apricot as the main factor,we comprehensively analyzed the threats of low temperature in winter in January and late frost in April in spring in the ili river valley.[Results]During the 12 years,there were 4 years of low temperature below the critical(-26—-28℃)of‘Shushanggan’Apricot in the ili river valley counties and cities in January,accounting for 33.3%,and a total of 59 *** frequency of occurrence was:Nilka County>Qapqal County>Yining City>Gongliu County>Huocheng County>Khorgos City>Yining County>Tekes County>Xinyuan *** April,there were 9 years with a low temperature below the critical temperature(-0.6℃)flowering and fruit setting of‘Shushanggan’Apricot,accounting for 75%,and a total of 134 *** frequency of occurrence was:Nilka County>Tekes County>Gongliu County>Yining County>Huocheng County>Khorgos City>Xinyuan County>Yining City>Qapqal *** low temperature threats of‘Shushanggan’Apricot suitable cultivation areas were ranked as follows:Nilka County>Gongliu County>Tekes County>Qapqal County>Huocheng County>Yining City>Yining County>Khorgos City>Xinyuan *** with the observation and survey of frost damage on the spot,we comprehensively analyzed and evaluated the cultivation area of‘Shushanggan’Apricot in the ili river valley:three counties(Nilka County,Gongliu County,and Tekes County)in the eastern region,except Xinyuan County,suffered frequent late frost damage,are suitable areas for the cultivation of‘Shushanggan’Apricot;three counties and two cities in the western region(Qapqal County,Huocheng County,Yining City,Yining County,Khorgos City)and Xinyuan County in the eastern region are suitable areas for‘Shu

关键词： ‘Shushanggan’Apricot ili river valley Frost damage Threats Avoidance measures

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