基于CWSI的汾河流域干旱时空变化特征

doi:10.13866/j.azr.2024.02.02

Abstract

Abstract:

Based on MOD16 global evapotranspiration data, the Crop Water Stress Index (CWSI) was computed. This was combined with the meteorological station precipitation, temperature, and vegetation index data in the Fenhe River Basin, along with land use data. Employing the difference method, linear trend method, and correlation analysis, the temporal and spatial characteristics of drought in the Fenhe River Basin from 2000 to 2021 were analyzed. The results showed that: (1) CWSI effectively monitored drought in the Fenhe River Basin, displaying a notably negative correlation between CWSI and 10 cm soil relative moisture. (2) The spatial distribution of CWSI in the Fenhe River Basin exhibited significant disparities, illustrating wet conditions in the south and dry conditions in the north. (3) While interannual CWSI variations in the Fenhe River Basin remained relatively stable, monthly fluctuations were substantial, peaking in May annually. (4) Drought conditions varied distinctly during different growing periods in the Fenhe River Basin: significant drought occurred in the early growing season (April to May), encompassing 48.55% of the Fenhe River Basin area. No drought occurred in the mid-growing season (June to August). By the end of the growing season (September to October), only 11.17% of the area experienced drought. (5) Drought occurrences differed among various land use types, ranked by CWSI from smallest to largest: forest land (0.686) < grassland (0.749) < cultivated land (0.751) < unused land (0.758) < urban land (0.765). These study outcomes offer critical scientific data support for drought monitoring and decision-making regarding drought resistance in the Fenhe River Basin.

Key words: drought, Crop Water Stress Index, spatiotemporal changes, Fenhe River Basin

ZHOU Yi, SUO Wenjiao. Spatialtemporal variation characteristics of drought in the Fenhe River Basin based on CWSI[J].Arid Zone Research, 2024, 41(2): 191-199.

Figures/Tables 15

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数据	时间	数据来源
MOD16A3	2000—2021年	NTSG（http://www.ntsg.umt.edu/）
MOD16A2	2000—2021年	NTSG（http://www.ntsg.umt.edu/）
土壤相对湿度	2012年4—10月	国家气象信息中心（http://data.cma.cn/data/）
降水	2001—2020年	国家青藏高原科学数据中心
温度	2001—2020年	（https://data.tpdc.ac.cn/）
植被指数	2001—2020年	中国科学院资源环境科学数据中心(https://www.resdc.cn/)
30 m土地利用	2020年	（http://www.resdc.cn/data）

等级	类型	RSM/%	CWSI
1	无旱	>60	<0.7909
2	轻旱	50~60	0.7909~0.8296
3	中旱	40~50	0.8296~0.8689
4	重旱	30~40	0.8689~0.9079
5	特旱	<30	>0.9079

	降水量	温度	NDVI
CWSI	-0.308^**	0.214^**	-0.422^**
ET	0.233^**	-0.161^**	0.503^**
PET	-0.351^**	0.27^**	0.030

	轻旱	中旱	重旱	特旱
4—5月	6.83%	13.29%	25.08%	48.55%
6—8月	5.97%	0.16%	0	0
9—10月	11.03%	0.14%	0	0

	降水量	温度	NDVI
CWSI	-0.439^**	0.417^**	-0.366^**
ET	0.736^**	0.516^**	0.718^**
PET	0.341^**	0.803^**	0.352^**

Spatialtemporal variation characteristics of drought in the Fenhe River Basin based on CWSI

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