摘要
及时了解和定量分析荒漠区河岸带湿地月度时序变化趋势及对生态输水过程的响应,对认识湿地生态修复过程,改进生态输水策略,维护湿地生态系统稳定具有重要意义。该文基于Landsat ETM+/TM/OLI和Sentinel 2形成的月尺度的密集长时序遥感数据,分析2000–2018年塔里木河下游英苏-阿拉干之间的湿地时序变化特征,并评估湿地变化对生态输水过程的响应。结果表明:近19年来湿地面积持续增加,其中2011–2013年和2017–2018年是面积快速增加的时段。不同的单、双通道输水方式和输水量大小解释了喀尔达依湿地与博孜库勒湿地在不同时段增长的快慢。对湿地面积与生态输水量、地下水埋深关系的分析表明,累计生态输水量的持续增加是近20年来塔里木河下游河岸带湿地扩张的重要因素,每年大于3.5亿m3的双通道生态输水,地下水埋深维持在–5.0––3.5 m是湿地持续稳定增长的关键。
Aims Ecological water conveyance is of great importance for desert riparian wetland ecosystem.However,few studies have been focused on the quantitative evaluation of water conveyance to wetland restoration due to a lack of continous observation data.This paper analyzed the temporal wetland area changes between Yengisu and Alagan in the lower reach of Tarim River based on time series remote sensing data during 2000–2018,and evaluated the effects of ecological water conveyance on wetland restoration,so as to guide the ecological water conveyance and maintain the stability of the desert wetland ecosystem.Methods About 354 Landsat ETM+/TM/OLI,Sentinel 2 images during 2000–2018 were used to map the monthly wetland area changes in the lower reach of Tarim River,then their annual,seasonal and spaital areal changes were analyzed.The correlation between wetland area changes and ecological water conveyance,underground water levels were also evaluated based on Pearson correlation and cross-correlation methods.Important findings The wetland area has steadly increased in the last 19 years.The areal change rate was minor before 2011 while rapidly increased after 2011.The wetland expanded at a high rate during 2011–2013 and 2017–2018.Different ecological water volumes and water conveyance patterns(single channel or dual channel)can explain different areal changing rates at different stages.The correlation analysis between wetland area changes and ecological water volumes showed that the accumulative ecological water volume is the primary reason causing wetland expansion in recent years.In order to maintain a steady improvement of wetland vegetation,more than 350 million square meters of ecological water are conveyed to the downstream of the Tarim River through dual channel.When the groundwater depth is maintained between–5.0––3.5 m,the wetland vegetation can sustain a good growth condition.
作者
蔚亮
李均力
包安明
白洁
黄粤
刘铁
沈占锋
YU Liang;LI Jun-Li;BAO An-Ming;BAI Jie;HUANG Yue;LIU Tie;and SHEN Zhan-Feng(State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,ürümqi 830011,China;University of Ch10:372021/1/25inese Academy of Sciences,Beijing 100049,China;Key Laboratory of GIS&RS Application Xinjiang Uygur Autonomous Region,ürümqi 830011,China;and 4Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2020年第6期616-627,共12页
Chinese Journal of Plant Ecology
基金
国家重点研发项目(2017YFB0504204)
中国科学院创新交叉团队项目(JCTD-2019-20)
国家自然科学基金(41671034和41971375)
天山雪松人才计划(2018XS11)
关键词
荒漠区河岸带湿地
时间序列
生态输水效应
时滞分析
塔里木河下游
desert riparian wetlands
time series
ecological water conveyance effect
temporal delay analysis
lower reaches of Tarim River
