1982—2017年典型干旱年的中国GPP变化

doi:10.12118/j.issn.1000-6060.2023.078

Abstract

Abstract:

The reduction in gross primary productivity (GPP) resulting from drought can significantly impact the terrestrial carbon sink. Based on the standard precipitation evapotranspiration index (SPEI) calculated from the monthly meteorological data of 618 sites from the entire country and two publicly available GPP datasets (i.e., EC-LUE GPP and GLASS GPP, respectively), changes in the GPP affected on different scales by different degrees of drought in a typical drought year during 1982—2017 (2001 and 2011) in China were analyzed systematically. The results revealed that: (1) Based on the five selected indicators of the SPEI, the typical drought years during 1982—2017 were selected as 2001 and 2011. (2) On the annual and seasonal scales, the drought-affected GPP in 2001 was observed mainly in north China, northeast China, and the northern part of middle east region of China, as well as in the southeast and middle east of the southwest region of China in 2011. On the monthly scale, the GPP in May 2001 was the most severely affected by drought, mainly concentrated in most of north China and northeast China; however, in January 2011, the GPP was mainly concentrated in majority of the middle east region of China. (3) Irrespective of the annual, seasonal, or monthly scale, with the increase in the degree of drought, the decline rate of GPP was higher, and the impact of extreme drought was the highest. For example, on the seasonal scale, the decline in the GPP during extreme drought in the summer of 2001 was 19.96% (EC-LUE GPP) and 15.57% (GLASS GPP), and the decline in the GPP during extreme drought in the spring of 2011 was 14.32% (EC-LUE GPP) and 8.75% (GLASS GPP). The results revealed can further deepen the understanding of the effect of different grades of drought on GPP, which is key for understanding the exchange of carbon between the land and atmosphere under drought conditions.

Key words: typical drought, standardized precipitation evapotranspiration index, gross primary productivity, China

CAO Yujuan, SI Wenyang, DU Ziqiang, LIANG Hanxue, LEI Tianjie, SUN Bin, WU Zhitao. Changes in GPP of China during the typical drought years from 1982 to 2017[J].Arid Land Geography, 2023, 46(10): 1577-1590.

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指标	选取年份
SPEI最小的4 a	2001、2004、2009、2011
发生干旱站点百分比最大的4 a	2001（47.4%）、2004（48.1%）、2009（47.7%）、2011（48.9%）
轻度干旱站点百分比超过50%	-
中度干旱站点百分比超过20%	1986（20.6%）
重度干旱站点百分比超过10%	1997（10.8%）、2001（10.0%）、2011（13.3%）

干旱等级	2001年		2011年
干旱等级	EC-LUE GPP占比	GLASS GPP占比	EC-LUE GPP占比	GLASS GPP占比
轻度干旱	-7.77	-6.87	-7.00	-6.49
中度干旱	-8.77	-7.09	-7.33	-5.94
重度干旱	-14.04	-10.12	-9.41	-7.16
极端干旱	-21.77	-16.01	-9.69	-6.72

季节	GPP类型	2001年				2011年
季节	GPP类型	轻度干旱	中度干旱	重度干旱	极端干旱	轻度干旱	中度干旱	重度干旱	极端干旱
春季	EC-LUE GPP	-12.34	-12.71	-9.47	-9.52	-9.25	-12.31	-13.23	-14.32
春季	GLASS GPP	-10.86	-10.38	-6.99	-7.16	-7.25	-8.98	-8.28	-8.75
夏季	EC-LUE GPP	-11.89	-12.66	-18.61	-19.96	-6.62	-8.95	-9.01	-9.41
夏季	GLASS GPP	-10.17	-10.15	-13.47	-15.57	-8.72	-6.75	-6.72	-4.89
秋季	EC-LUE GPP	-7.12	-8.68	-14.03	-10.16	-4.53	-6.54	-6.62	-9.23
秋季	GLASS GPP	-5.71	-7.21	-13.78	-9.39	-5.61	-6.08	-8.34	0.00

月份	GPP类型	轻度干旱	中度干旱	重度干旱	极端干旱
5	EC-LUE GPP	-18.80	-22.54	-22.74	-22.91
5	GLASS GPP	-15.63	-22.10	-15.17	-15.43
6	EC-LUE GPP	-10.66	-18.59	-20.17	-15.48
6	GLASS GPP	-8.35	-13.29	-12.12	-9.64
7	EC-LUE GPP	-13.48	-13.91	-15.88	-19.42
7	GLASS GPP	-11.37	-11.19	-13.82	-17.31
8	EC-LUE GPP	-11.38	-12.50	-18.61	-18.62
8	GLASS GPP	-10.94	-12.02	-17.52	-14.81
9	EC-LUE GPP	-9.23	-11.43	-18.13	-17.64
9	GLASS GPP	-8.31	-9.77	-15.94	-16.29

月份	GPP类型	轻度干旱	中度干旱	重度干旱	极端干旱
1	EC-LUE GPP	-48.46	-86.29	-91.99	-97.91
1	GLASS GPP	-51.16	-86.68	-91.86	-97.89
4	EC-LUE GPP	-10.35	-15.32	-16.75	-17.36
4	GLASS GPP	-9.23	-9.96	-10.59	-11.28
5	EC-LUE GPP	-9.61	-12.88	-13.17	-14.80
5	GLASS GPP	-6.92	-8.83	-8.12	-10.00
6	EC-LUE GPP	-11.10	-10.62	-12.90	-18.31
6	GLASS GPP	-9.23	-7.26	-7.31	-8.42
7	EC-LUE GPP	-8.31	-8.80	-9.20	-5.46
7	GLASS GPP	-7.58	-6.56	-6.57	-2.89
8	EC-LUE GPP	-10.97	-12.28	-15.78	-12.14
8	GLASS GPP	-9.27	-8.32	-9.94	-6.54

Changes in GPP of China during the typical drought years from 1982 to 2017

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