Drivers of carbon flux in drip irrigation maize fields in northwest China

Table 7 Comparisons of annual net ecosystem productivity (NEP), gross primary productivity (GPP), ecosystem respiration (ER) and ER/GPP for maize ecosystem in different regions

No.	Site	Latitude & longitude	Vegetation	Temperature	Precipitation	Period	NEP	GPP	ER	ER/GPP	Sources
No.	Site	Latitude & longitude	Vegetation	(℃)	(mm)	Period	(g C m⁻²)	(g C m⁻²)	(g C m⁻²)	(%)	Sources
1	Wuwei, China	37°52′ N, 102°50′ E	Spring maize	7.8	118	2014	630	1115	485	44	This study
					112	2015	729	1705	975	57
					82	2016	569	1422	853	60
					98	2017	373	1069	694	65
					156	2018	527	1252	725	58
2	Shouyang, China	37°45′ N, 113°12′ E	Spring maize (mulching)			2013–2014	579	1459	880	60	[16]
2	Shouyang, China	37°45′ N, 113°12′ E	Spring maize (non− mulching)			2013–2014	518	1370	852	62	[16]
3	Nerbraska, USA	41°09′ N, 96°28′ W	Irrigated− maize			2001–2008	767	1796	1029	57	[39]
3	Nerbraska, USA	41°09′ N, 96°28′ W	Rain− fed maize			2001–2008	664	1536	872	57	[39]
4	Wageningen, Netherlands	51°59′ N, 5°38′ E	Maize	10.5	803	2007–2008	332	1982	1652	83	[21]
5	Lamasquere, France	43°49′ N, 01°23′ E	Spring maize	12.95	620	2006	186	1286	1100	85	[8]
6	Northeast, Italy	46°00′ N, 13°01′ E	Maize			2007	473	1471	805	55	[1]
7	Yingke, China	38°51′ N, 100°25′ E	Spring maize	7.4	68.1	2007–2008	626	1567	941	60	[43]
8	Weishan, China	36°39′ N, 116°03′ E	Summer maize	13.3	532	2007	201	872	672	77	[26]
8	Weishan, China	36°39′ N, 116°03′ E	Summer maize	13.3	532	2008	244	880	636	72	[26]
9	luancheng, China	37°53′ N, 114°41′ E	Summer maize	12.5	480		143	556	413	74	[44]

ISSN: 1750-0680