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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

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

No. Site Latitude & longitude Vegetation Temperature Precipitation Period NEP GPP ER ER/GPP Sources
(℃) (mm) (g C m−2) (g C m−2) (g C m−2) (%)
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]
Spring maize (non− mulching) 2013–2014 518 1370 852 62
3 Nerbraska, USA 41°09′ N, 96°28′ W Irrigated− maize    2001–2008 767 1796 1029 57 [39]
Rain− fed maize 664 1536 872 57
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]
2008 244 880 636 72
9 luancheng, China 37°53′ N, 114°41′ E Summer maize 12.5 480   143 556 413 74 [44]