气候变化和土地利用覆盖变化对河西地区植被净初级生产力的影响

doi:10.13866/j.azr.2024.01.16

干旱区研究 ›› 2024, Vol. 41 ›› Issue (1): 169-180.doi: 10.13866/j.azr.2024.01.16

• 生态与环境 • 上一篇

气候变化和土地利用覆盖变化对河西地区植被净初级生产力的影响

刘一丹¹(),姚晓军¹(),李宗省^1,²,胡家瑜¹

1.西北师范大学地理与环境科学学院，甘肃兰州 730070
2.中国科学院西北生态环境资源研究院，高寒山区同位素生态水文与国家公园观测研究站，甘肃省祁连山生态环境研究中心，干旱区生态安全与可持续发展全国重点实验室，甘肃兰州 730000

收稿日期:2023-08-16 修回日期:2023-11-10 出版日期:2024-01-15 发布日期:2024-01-24
通讯作者: 姚晓军. E-mail: xj_yao@nwnu.edu.cn
作者简介:刘一丹（2001-），女，硕士研究生，主要从事干旱区植被生态研究. E-mail: ylnorth@foxmail.com
基金资助:
国家自然科学基金(42071089)

Impacts of climate change and land use/cover change on the net primary productivity of vegetation in Hexi Region, Northwest China

LIU Yidan¹(),YAO Xiaojun¹(),LI Zongxing^1,²,HU Jiayu¹

1. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, Gansu, China
2. Observation and Research Station of Eco-Hydrology and National Park by Stable Isotope Tracing in Alpine Region, Gansu Qilian Mountains Ecology Research Center, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

Received:2023-08-16 Revised:2023-11-10 Online:2024-01-15 Published:2024-01-24

摘要/Abstract

摘要：

河西地区不仅是我国重要的生态安全保护优先区，而且是丝绸之路经济带核心地段，开展该地区植被净初级生产力（NPP）评估及驱动力定量分析对于陆地生态系统与大气碳交换、气候变化与人类活动对植被综合作用等研究具有重要的理论价值和现实意义。基于MOD17A3产品数据、土地利用覆盖数据和气象数据，采用R-贡献率和偏相关分析方法，分析了2000—2020年河西地区植被NPP变化特征及土地利用覆被和气候变化对NPP的影响，结果表明：（1）河西地区耕地、水域和居民建筑用地面积整体呈增加趋势，而草地和未利用土地面积有所减少，且2010年后的土地利用覆盖变化（LUCC）整体动态度显著提高，其中，草地、耕地、建设用地和未利用地主导了土地利用类型的相互转换。（2）河西地区整体植被NPP呈增长趋势，2000—2010年和2010—2020年的变化斜率分别为0.86和1.29，且植被NPP具有明显的区域异质性，由东南向西北递减。（3）2000—2020年河西地区LUCC对植被NPP的影响逐渐增大，且气候变化对植被NPP的贡献率普遍高于LUCC，但二者对不同土地利用覆盖类型所起的作用不同，表现为耕地、林地和草地的植被NPP影响因子以气候变化为主导，未利用土地和居民建筑用地的植被NPP影响因子逐步以LUCC为主导。

关键词: 净初级生产力, 土地利用, 时空变化, 驱动因素, 河西地区

Abstract:

The Hexi Region holds a dual significance in China, being both a pivotal area for ecological security and the core of the Silk Road Economic Belt. The assessment of the net primary productivity (NPP) of the region and a quantitative analysis of the driving forces behind these dynamics bears immense theoretical importance and practical implications. Based on MOD17A3 product, land use cover, and meteorological information, this study scrutinized the evolving characteristics of the vegetation-related NPP, the influence of land use cover changes, and climate fluctuations on the NPP of the Hexi Region from 2000 to 2020. This study employed R-contribution rate and biased correlation analysis methods. The results show that: (1) There was an overall increase in the area of arable land, waters, and residential land in the Hexi Region, while the grassland and unused land area was reduced. The overall dynamics of land use cover change (LUCC) after 2010 was significantly higher, with grassland, cropland, built-up land, and unused land dominating the inter-conversion of land use types. (2) The overall NPP in the Hexi Region increased, with rates of change of 0.86 and 1.29 in the periods 2000-2010 and 2010-2020, respectively. There was a significant regional variation in NPP, which decreased from southeast to northwest. (3) The influence of LUCC on NPP gradually increased from 2000 to 2020. While climate change contributed more to NPP than LUCC, their respective roles varied among land use cover types. Specifically, climate change dominated the influence factor of NPP on cropland, forested land, and grassland, whereas for unutilized land and residential construction areas, LUCC played a more significant role.

Key words: net primary productivity, land use/land cover, spatial and temporal changes, driving factors, Hexi Region

刘一丹, 姚晓军, 李宗省, 胡家瑜. 气候变化和土地利用覆盖变化对河西地区植被净初级生产力的影响[J]. 干旱区研究, 2024, 41(1): 169-180.

LIU Yidan, YAO Xiaojun, LI Zongxing, HU Jiayu. Impacts of climate change and land use/cover change on the net primary productivity of vegetation in Hexi Region, Northwest China[J]. Arid Zone Research, 2024, 41(1): 169-180.

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市（州）	不同等级年均NPP占比/%					年均NPP /（g C·m^-2·a^-1）	年NPP /（10⁶ g C·m^-2·a^-1）
市（州）	<100	100~200	200~300	300~400	≥400	年均NPP /（g C·m^-2·a^-1）	年NPP /（10⁶ g C·m^-2·a^-1）
兰州^*	2.80	65.82	20.75	5.36	5.27	200.83	54.85
白银^*	15.02	75.05	7.11	2.57	0.25	135.18	32.94
临夏	1.07	23.20	67.68	6.31	1.75	232.59	8.59
武威	53.68	16.21	12.76	11.75	5.60	123.42	123.96
金昌	42.05	34.34	13.55	9.91	0.15	125.61	29.81
张掖	43.23	23.95	17.47	12.72	2.63	143.98	173.43
酒泉	96.77	2.49	0.50	0.24	0.00	7.07	37.84
嘉峪关	92.18	3.91	2.69	1.22	0.00	15.43	0.60
合计	76.53	12.36	5.91	3.96	1.24	984.11	462.02

年份	不同土地利用类型年平均净初级生产力/（g C·m^-2·a^-1）
年份	耕地	林地	草地	水域	居民建筑用地	未利用土地
2000年	166.60	228.88	72.27	53.66	134.94	7.56
2010年	195.93	280.28	90.83	69.93	157.97	9.72
2020年	228.72	298.92	105.57	78.13	156.05	10.57
平均	197.08	269.36	89.56	67.24	149.65	9.28

土地利用类型	影响因素	2000—2010年		2010—2020年
土地利用类型	影响因素	影响量/（Tg C）	贡献率/%	影响量/（Tg C）	贡献率/%
耕地	气候变化	56.39	73.78	66.42	90.49
耕地	LUCC	17.04	22.28	5.98	8.15
林地	气候变化	43.82	99.68	15.89	98.69
林地	LUCC	-0.11	0.26	-0.19	1.24
草地	气候变化	125.26	99.85	99.55	96.97
草地	LUCC	0.15	0.12	-2.59	2.69
水域	气候变化	4.23	97.70	2.12	76.21
水域	LUCC	-0.07	1.80	0.59	21.28
居民建筑用地	气候变化	3.24	77.06	-0.28	3.73
居民建筑用地	LUCC	-0.28	6.69	7.91	95.24
未利用土地	气候变化	38.64	97.26	15.20	95.84
未利用土地	LUCC	-0.83	2.19	-0.58	3.99

气候变化和土地利用覆盖变化对河西地区植被净初级生产力的影响

Impacts of climate change and land use/cover change on the net primary productivity of vegetation in Hexi Region, Northwest China

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