基于Landsat影像的伊犁河流域草地地上生物量演变分析  

Above ground biomass evolution analysis of grassland inIli River Basin based on landsat imagery

作　　者：李超[1] 范天文 吐尔逊江·艾力木别克 贺军 李建伟 文俊 张琳 靳瑰丽[1] 李莹 刘文昊 王生菊 LI Chao;FAN Tianwen;Tuerxunjiang Ailimubieke;HE Jun;LI Jianwei;WEN Jun;ZHANG Lin;JIN Guili;LI Ying;LIU Wenhao;WANG Shengju(Xinjiang Key Laboratory of Grassland Resources and Ecology/Key Laboratory of Grassland Resources and Ecology in Western Arid Region,Ministry of Education/College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,China;Grassland Workstation of Ili Kazakh Autonomous Prefecture,Yining Xinjiang 835000,China;Bureau of Forestry and Grassland of Ili Kazakh Autonomous Prefecture,Yining Xinjiang 835000,China)

机构地区：[1]新疆农业大学草业学院/新疆草地资源与生态重点实验室/西部干旱荒漠区草地资源与生态教育部重点实验室,乌鲁木齐830052 [2]伊犁哈萨克自治州草原工作站,新疆伊宁835000 [3]伊犁哈萨克自治州林业和草原局,新疆伊宁835000

出　　处：《新疆农业科学》2025年第2期463-473,共11页Xinjiang Agricultural Sciences

基　　金：第三次新疆综合科学考察项目(2022xjkk0401);伊犁哈萨克自治州草原生态综合监测项目。

摘　　要：【目的】分析伊犁河流域草地地上生物量(Above ground biomass,AGB)的演变,为合理利用该草地提供科学依据。【方法】采用1990~2022年Landsat数据与实测数据相结合,构建伊犁河流域草地AGB反演模型,分析该流域及流域内10个县(市)草地AGB时空演变特征及其稳定性,并运用趋势分析和F显著性检验揭示草地的历史演变规律。【结果】在建立的回归模型中,二次函数反演模型精度最高,其验证精度为71.22%,可用于伊犁河流域草地AGB反演;在时间变化上,1990~2022年伊犁河流域草地AGB呈现波动增加趋势,从1990年的270.60 g/m^(2)增加到2022年的500.22 g/m^(2),增长速率为8.96 g/(m^(2)·a),其中新源县增加速率最快,为14.57 g/(m^(2)·a);霍尔果斯市增加速率最慢,为4.33 g/(m^(2)·a)。在空间变化上,东部新源县、尼勒克县,南部巩留县、昭苏县及北部伊宁县偏高,西部霍城县、察布查尔锡伯自治县偏低的分布格局;在变化趋势上,伊犁河流域草地AGB主要以改善为主,占草地总面积的59.67%。【结论】近33年来伊犁河流域草地AGB呈现出“大部改善,局部稳定,少量退化”的状态,气候的“暖湿化”以及草地保护的完善为草地AGB的改善提供了有利条件。【Objective】The evolution analysis of its grassland aboveground biomass(AGB)is of great significance for scientific understanding and rational utilization of grassland.【Methods】The spatio-temporal characteristics and stability of grassland AGB in the basin and 10 counties and cities in the basin were analyzed,and the historical evolution regular of grassland was revealed by trend analysis and F-significance test.【Results】Among the established regression models,the quadratic function inversion model had the highest accuracy with a validation accuracy of 71.22%,which could be used for aboveground biomass inversion.From 1990 to 2022,the AGB of grassland in Ili River basin showed a trend of fluctuating increase,from^(2)70.60 g/m^(2) in 1990 to 500.22 g/m^(2) in 2022,with an increase rate of 8.96 g/(m^(2)·a),Xinyuan County had the fastest growth rate of 14.57 g/(m^(2)·a),Khorgos City had the slowest increase rate of 4.33 g/(m^(2)·a).In terms of spatial variation,the distribution pattern demonstrated a relatively high level in Xinyuan County and Nileke County in the east,Gongliu County,Zhaosu County in the south,Yining County in the north,while a relatively low level in Huocheng County,Qapqal Xibe Autonomous County,and Gongliu County in the west.In terms of the change trend,grassland AGB mainly focusee on improvement,accounting for 59.67%of the total grassland area.【Conclusion】In general,in the past 33 years,the grassland AGB in Ili River basin has shown a state of‘mostly improved,locally stable and slightly degraded’.The‘warming and humidification’of climate,the improvement and implementation of grassland protection policies have provided favorable conditions for the better grassland AGB.

关 键 词：伊犁河流域 草地地上生物量 时空演变 

分 类 号：S812[农业科学—草业科学]