近40年科尔沁沙地植被时空变化及其驱动力

生态学杂志

近40年科尔沁沙地植被时空变化及其驱动力

吕家欣¹,李秀芬^1,3,郑晓^2,3,4*,聂哲¹,刘思嫱¹

(¹沈阳农业大学农学院，沈阳 110866； ²中国科学院森林生态与管理重点实验室（沈阳应用生态研究所），沈阳 110016； ³中国科学院清原森林生态系统观测研究站，沈阳 110016； ⁴中国科学院沈阳应用生态研究所大青沟沙地生态实验站，沈阳 110016)

出版日期:2020-05-10 发布日期:2020-05-10

Temporal and spatial changes and their driving forces of vegetation cover in Horqin Sandy Land in recent 40 years.

LYU Jia-xin¹, LI Xiu-fen^1,3, ZHENG Xiao^2,3,4*, NIE Zhe¹, LIU Si-qiang¹

(¹College of Agriculture, Shenyang Agricultural University, Shenyang 110866, China; ²CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Shenyang 110016, China; ³Qingyuan Forest CERN, Chinese Academy of Sciences, Shenyang 110016, China; ⁴Daqinggou Ecological Station, Institute of Applied Ecology, Shenyang 110016, China).

Online:2020-05-10 Published:2020-05-10

摘要/Abstract

摘要： 科尔沁沙地是我国沙漠化土地防治的重点工程区。近些年来，受气候变化、生态工程建设和人类活动的影响，该区的植被生长发生了一定的变化。研究区域植被的动态变化，可为后期沙地的综合治理和工程的合理建设提供科学依据。基于此，以1981—2015年NOAA-NDVI、MODIS-NDVI数据及同期气象和社会经济数据为依托，采用一元线性回归和相关分析的方法，对科尔沁沙地NDVI的时空变化及驱动因素进行了研究。结果表明：（1）1981—2015年NDVI整体呈波动的增长趋势（增速为0.00114 a^-1）；空间上NDVI呈增长趋势的区域（面积占68.8%）主要位于东南缘及中部部分地区，而研究区的西北缘呈降低趋势。（2）不同程度沙漠化区的NDVI均表现为先降低（1981—2000年）后上升（2001—2015年）的变化过程，说明前期遭受破坏的植被在后期得以恢复。（3）驱动力分析表明，降水和温度是驱动科尔沁沙地部分区域NDVI变化的影响因素；人口变化和生态工程的实施均驱动了区域内植被的时空变化；而经济的发展并不是该区植被变化的主要驱动因素。

关键词: 改良措施, 理化性质, 有机质, 铁尾矿, 生物量

Abstract: Horqin Sandy Land is a key area for the project of desertification prevention and control in China. In recent years, ecological engineering construction, human activities and vegetation growth in this area have been affected by climate change to some extent. Understandingdynamic change of regional vegetation can provide scientific basis for the comprehensive control of the sandy land and reasonable construction of ecological engineering. Consequently, the spatialtemporal variations and their driving factors of NDVI in Horqin Sandy Land were analyzed based on the dataset of NOAA-NDVI and MODIS-NDVI from 1981 to 2015, as well as meteorological and socioeconomic data. The results showed that from 1981 to 2015, NDVI showed a fluctuating increase trend (with a growth rate of 0.00114 a^-1). Spatially, areas with increasing NDVI(accounting for 68.8% area) were mainly located in the southeast margin and part of the central region, while NDVI of the northwest margin of the study area was decreasing. The change process of NDVI in desertification areas of different degrees was first decreased (1981-2000) and then increased (2001-2015), indicating that vegetation destroyed in the early stage was restored in the later stage. Results of driving force analysis showed that precipitation and temperature were the factors driving NDVI changes in some areas of Horqin Sandy Land. Population change and the implementation of ecological engineering drove the spatial-temporal change of vegetation in this region. However, economic development was not a major factor driving vegetation change in this area.

Key words: biomass., improvement effect, physico-chemical properties, organic matter, iron tailing

吕家欣,李秀芬,郑晓,聂哲,刘思嫱. 近40年科尔沁沙地植被时空变化及其驱动力[J]. 生态学杂志.

LYU Jia-xin, LI Xiu-fen, ZHENG Xiao, NIE Zhe, LIU Si-qiang. Temporal and spatial changes and their driving forces of vegetation cover in Horqin Sandy Land in recent 40 years.[J]. cje.

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