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| 浑善达克沙地腹地和边缘交错区NDVI演变对气候变化和人类活动的响应 | |
| 引用本文： | 马超,李晓婷,项晓铭,刘玮玮,李婷婷.浑善达克沙地腹地和边缘交错区NDVI演变对气候变化和人类活动的响应[J].资源科学,2023,45(1):204-221. |
| 作者姓名： | 马超 李晓婷 项晓铭 刘玮玮 李婷婷 |
| 作者单位： | 1.河南理工大学测绘与国土信息工程学院，焦作 454003 2.河南理工大学自然资源部矿山时空信息与生态修复重点实验室，焦作 454003 3.河南理工大学黄河流域耕地保护与城乡高质量发展研究中心，焦作 454003 4.河南省国土资源厅测绘地理信息局，郑州 450003 |
| 基金项目： | 国家自然科学基金-河南区域创新发展重点资助项目(U21A20108);河南省高校科技创新团队支持计划(22IRTSTHN008) |
| 摘 要： | 【目的】因研究区、研究数据、研究时段选择不同，浑善达克沙地的植被演变认识存在学术分歧。沙地腹地和边缘交错区的植被如何响应气候变化和人类活动，有待厘清。【方法】本文设置戈壁风蚀荒漠区为背景区，将沙地及周边区域分为沙地核心区和4种过渡类型区，基于长时序GIMMS NDVI3g v1.0(1982—2015年)数据集，结合气候、灯光、人口和畜牧业数据，分析了核心区及生态交错区植被物候、NDVI与气候变化和人类活动的相关性。【结果】研究发现：(1)沙地植被物候存在地带性差异：植被返青期（SOS）由东向西推迟，枯黄期（EOS）由西向东推迟，生长期（LOS）介于158～196 a之间，区内地带性差异达到38 d。(2)沙地植被增长率具有空间差异性：浑善达克沙地NDVI整体以0.00021/10 a的速率增加但不显著，各区NDVI增长速率有差异，最低增速与最高增速相差17倍。浑善达克沙地有向西、向南扩张，向东、向北收缩趋势。(3)沙地气候呈暖干化趋势：34年来气温以0.3℃/10 a的速率波动上升，降水以-14.0 mm/10 a的速率波动下降，各区植被对气温的敏感性高于降水。(4)沙地植被变异系数... |
| 关 键 词： | 生态交错区 植被物候 气候变化 变异系数 人类活动 浑善达克沙地 |
| 收稿时间： | 2022-07-28 |
| 修稿时间： | 2023-01-03 |
Responses of NDVI evolution to climate change and human activities in the Hunshandake Sandy Land and its ecotones |
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| MA Chao,LI Xiaoting,XIANG Xiaoming,LIU Weiwei,LI Tingting.Responses of NDVI evolution to climate change and human activities in the Hunshandake Sandy Land and its ecotones[J].Resources Science,2023,45(1):204-221. | |
| Authors: | MA Chao LI Xiaoting XIANG Xiaoming LIU Weiwei LI Tingting |
| Abstract: | Objective] Understandings of the ecological evolution in the Hunshandake Sandy Land are divergent duo to the differences in study area, data used, and period of study. How the vegetation in the hinterland and marginal ecotones of the Hunshandake Sandy Land interacts with regional climate and responds to human activities remain to be addressed. Methods] In this study, the Gobi desert area was set as the background area (CK), and the Hunshandake Sandy Land and its surrounding areas were divided into a core area (CA) and four ecotones. Based on the long-term GIMMS NDVI3g v1 (1982-2015) dataset, combined with climate data (annual temperature and precipitation) from 1982 to 2015, nighttime light dataset (1984-2015), and population and herbivore data of each banner/county (1986-2015), the correlations between NDVI and climate change and human activities in the CK, CA and the ecotones were analyzed. Results] The results show that: (1) Vegetation phenology was regionally heterogeneous. The length of growing season (LOS) was between 158 and 196 days, and the phenological difference within the region reached 38 days. (2) The change rate of NDVI was spatially different. Total NDVI increased at a rate of 0.00021/10a, while the rate of change in each region varied, with a maximum difference of 17 folds. (3) The response of vegetation to climate variability was zonal. In these ecotones, NDVI change was more sensitive to monthly temperature than to monthly precipitation. (4) The coefficient of variation (Cov) of vegetation went through several stages. The Cov fluctuated little in the 1980s, was relatively stable in the 1990s, and had higher positive variation in the first 15 years of this century. (5) The response of vegetation cover to human activities was not significant. While NDVI was not correlated with population density and nighttime light intensity per square kilometer, it was locally positively correlated with sheep and total herbivorous livestock density per square kilometer. Conclusion] These results suggest that the NDVI of the Hunshandake Sandy Land and its ecotones fluctuated in response to climate change, and although it has improved in this century, it has only reached the level of the mid- to late 1980s. |
| Keywords: | ecotones vegetation phenology climate change coefficient of variation (Cov) human activities Hunshandake Sandy Land |
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