干旱对中国东北黑土区不同植被总初级生产力的时滞与累积效应  

Time lag and cumulative effects of drought on the gross primary productivity of different vegetation types in the black soil region of Northeast China

作　　者：薛泽 李雪冬 费龙[1] 杨拂晓 董炜华[1] 刘言 Xue Ze;Li Xuedong;Fei Long;Yang Fuxiao;Dong Weihua;Liu Yan(School of Geographical Sciences,Changchun Normal University,Changchun 130032,Jilin,China)

机构地区：[1]长春师范大学地理科学学院,吉林长春130032

出　　处：《地理科学》2024年第11期2060-2071,共12页Scientia Geographica Sinica

基　　金：吉林省科技发展计划项目(20240601077RC);国家自然科学基金项目(42301048);吉林省教育厅十四五科学技术研究项目(JJKH20220831KJ);长春师范大学自然科学基金项目(CSJJ2019008ZK);长春师范大学研究生创新项目(YJSCX2024006)资助。

摘　　要：本文以中国东北黑土区为研究区,基于NIRv-GPP数据集、SPEI数据集,探究1982—2018年干旱对东北黑土区不同植被类型的时滞与累积效应。研究结果表明:①东北黑土区SPEI与GPP在1982—2018年呈现波动性变化,其中2010年后呈明显上升趋势;②干旱对东北黑土区99.4%的植被造成了时滞效应,时滞的时间尺度集中在1~2个月和9~10个月;随旱情加重,时滞月数增长而时滞效应减弱;干旱对草地、林地的时滞效应较为显著;③黑土区96.38%的植被受累积效应的影响,累积时间尺度集中在2~3个月;随旱情的加重,累积月数增长而累积效应减弱;干旱对草地、耕地的累积效应较为显著;④干旱对东北黑土区不同植被类型的主导效应不同,79.88%的草地对干旱的主导效应为累积效应,55.6%的耕地、85.64%的林地主导效应为时滞效应。Against the backdrop of global climate warming,the frequency and intensity of droughts are increasing,exerting significant stress on vegetation,reducing productivity,and consequently impacting the carbon cycle of entire ecosystems.The black soil region of Northeast China,one of the world’s 4 major black soil zones,is more sensitive to climate change than the global average,and as China’s most important grain repository,playing a crucial role in ensuring the country’s food security.Therefore,examining time lag effects and cumulative effects of drought on vegetation in the black soil region of Northeast China is of significant importance for promoting agricultural production,advancing environmental protection,and maintaining ecosystem services.This study focuses on the black soil region of Northeast China,utilizing the NIRv-GPP and SPEI datasets,and employs Pearson correlation analysis to explore time lag effects and cumulative effects of drought on different types of vegetation from 1982 to 2018.The results indicate that:1)The SPEI and GPP in the black soil region of Northeast China exhibited fluctuating changes from 1982 to 2018,with general dicline from 1990 to 2010,followed by a significant upward trend after 2010;2)Drought caused time lag effects on 99.4%of the vegetation in the Northeast black soil region,with lag time scales predominantly spanning 1-2 months and 9-10 months;as drought severity increased,the lag months increased while the intensity of time lag effects weakened;time lag effects were more significant on grasslands and forests;3)96.38%of the vegetation in the black soil region of Northeast China was affected by cumulative effects,with cumulative time scales concentrated within 2-3 months;as drought severity increased,the cumulative time scales increased while the intensity of cumulative effects weakened;cumulative effects were more significant on grasslands and croplands;4)The dominant effects of drought on different vegetation types in the black soil region of Northeast China varied,with

关 键 词：干旱 东北黑土区 总初级生产力 时滞效应 累积效应 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]