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Journal of Arid Land  2026, Vol. 18 Issue (7): 1115-1134    DOI: 10.1016/j.jaridl.2026.04.010    
Research article     
Performance-based assessment of gross primary production (GPP) products in a typical inland river basin of northwestern China
HU Jieyuan1,2, CHANG Xiaoge1, YANG Linshan1, NING Tingting1,*()
1 State Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2 University of Chinese Academy of Sciences, Beijing 101408, China
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Abstract  

Accurate estimation of gross primary production (GPP) is crucial for understanding terrestrial carbon cycling, yet the regional performance of existing GPP products remains insufficiently quantified. This study evaluated four widely used GPP products, i.e., the Moderate Resolution Imaging Spectroradiometer (MODIS, e.g., MOD17), Global OCO-2-based Solar-Induced Chlorophyll Fluorescence (SIF) product (GOSIF), Global Land Surface Satellite (GLASS), and Penman-Monteith-Leuning Version 2 (PML_V2), across five representative ecosystems in the Heihe River Basin (HRB), northwestern China using 18 eddy covariance (EC) sites during 2007-2022. Multi-scale validation revealed pronounced spatial and ecosystem-dependent differences. Although all products captured the general basin-scale gradient, an analysis of the spatial coefficient of variation (CV) revealed distinct differences in their ability to resolve spatial heterogeneity: PML_V2 and GLASS reasonably captured the observed spatial variability, whereas MOD17 and GOSIF tended to smooth over fine-scale details. Furthermore, a systematic compression of the productivity gradient was evident across products, characterized by considerable underestimation in high-productivity ecosystems (forest land and cropland) and general overestimation in grassland. Temporally, all products performed more reliably in capturing seasonal dynamics than in reproducing inter-annual variations. At the growing season scale, GLASS and GOSIF achieved the highest explanatory power (r>0.95 at several sites), whereas MOD17 exhibited the lowest error (root mean square error (RMSE)=25.26 g C/m2 at the Jingyangling site (JYL)). However, inter-annual performance declined markedly, with MOD17 showing weak correlations (r<0.30) at most sites. Ecosystem-specific results identified GOSIF as superior for cropland and wetland ecosystems, while PML_V2 offered the best performance in grassland and desert ecosystems by minimizing systematic bias. Notably, all products consistently failed to establish meaningful correlations (r<0.21) with observations in desert areas due to the low ratios of signal to noise. Consequently, we recommend an ecosystem-dependent application strategy—specifically prioritizing GOSIF for cropland and wetland and PML_V2 for grassland—and urge extreme caution when applying single remote-sensing GPP products in arid desert areas.



Key wordsgross primary production (GPP)      GPP product validation      eddy covariance      arid areas      Heihe River Basin     
Received: 19 December 2025      Published: 31 July 2026
Corresponding Authors: *NING Tingting (E-mail: ningting2012@126.com)
About author: First author contact:

Methodology, data curation, software, and writing - original draft preparation: HU Jieyuan; Data curation, resources, and writing - review and editing: CHANG Xiaoge; Writing - review and editing: YANG Linshan; Conceptualization, supervision, validation, and writing - review and editing: NING Tingting. All authors approved the manuscript.

Cite this article:

HU Jieyuan, CHANG Xiaoge, YANG Linshan, NING Tingting. Performance-based assessment of gross primary production (GPP) products in a typical inland river basin of northwestern China. Journal of Arid Land, 2026, 18(7): 1115-1134.

URL:

http://jal.xjegi.com/10.1016/j.jaridl.2026.04.010     OR     http://jal.xjegi.com/Y2026/V18/I7/1115

Fig. 1 Sampling site and land use type in the Heihe River Basin (HRB). HMo, Huangmo; NTi, Nongtian; SDQ, Sidaoqiao; LDi, Luodi; HYL, Huyanglin; HHL, Hunhelin; DSL, Dashalong; ZYW, Zhangye wetland; BJT, Bajitan; DMS, super Daman; YKe, Yingke; SSW, Shenshawo; HZZ, Huazhaizi; DDS, Dadongshu; ARS, super Arou; ARo, Arou; JYL, Jingyangling; GTa, Guantan.
No. Name Site_ID Longitude Latitude Land use type Dominant plant Elevation (m) Period Stream
1 Jingyangling site JYL 101°06′58″E 37°50′18″N Alpine grassland Kobresia pygmaea (C. B. Clarke)
C. B. Clarke
3750 2018-2022 Up
2 Super Arou site ARS 100°27′51″E 38°02′50″N Alpine grassland K. pygmaea 3033 2013-2022 Up
3 Dadongshu site DDS 100°14′32″E 38°00′51″N Alpine grassland K. pygmaea 4148 2015-2022 Up
4 Dashalong site DSL 98°56′26″E 38°50′24″N Alpine marshland K. pygmaea 3739 2013-2022 Up
5 Super Daman site DMS 100°22′20″E 38°51′20″N Cropland Seed corn 1556 2012-2022 Middle
6 Zhangye wetland site ZYW 100°26′47″E 38°58′30″N Wetland Reed 1460 2012-2022 Middle
7 Huazhaizi site HZZ 100°19′07″E 38°45′55″N Desert Salsola passerina Bunge 1731 2012-2022 Middle
8 Sidaoqiao site SDQ 101°08′15″E 42°00′04″N Woodland Tamarisk 873 2013-2022 Down
9 Hunhelin site HHL 101°08′01″E 41°59′25″N Woodland Populus euphratica Olivier and Tamarix L. 874 2013-2022 Down
10 Huangmo site HMo 100°59′14″E 42°06′49″N Desert Reaumuria L. 1054 2015-2022 Down
11 Arou site ARo 100°27′53″E 38°02′39″N Alpine grassland K. pygmaea 3033 2008-2011 Up
12 Guantan site GTa 100°15′00″E 38°32′00″N Subalpine forest land Picea crassifolia Kom. 2835 2010-2011 Up
13 Yingke site YKe 100°24′37″E 38°51′26″N Cropland Seed corn 1519 2008-2011 Middle
14 Bajitan site BJT 100°18′15″E 38°54′54″N Gobi - 1562 2012-2014 Middle
15 Shenshawo site SSW 100°29′36″E 38°47′21″N Desert - 1594 2012-2015 Middle
16 Luodi site LDi 101°07′57″E 41°59′57″N Bare land - 878 2013-2015 Down
17 Nongtian site NTi 101°08′02″E 42°00′17″N Cropland Cucumis melo L. 875 2013-2015 Down
18 Huyanglin site HYL 101°07′26″E 41°59′36″N Woodland P. euphratica 876 2013-2015 Down
Table 1 Site information from the eddy covariance (EC) flux stations in the Heihe River Basin (HRB)
Fig. 2 Statistical comparison between site-based observations and four gross primary production (GPP) products, i.e., Penman-Monteith-Leuning Version 2 (PML_V2), Moderate Resolution Imaging Spectroradiometer (MODIS, e.g., MOD17), GOSIF (Global OCO-2-based Solar-Induced Chlorophyll Fluorescence), and GLASS (Global Land Surface Satellite). (a-c), Pearson's correlation coefficient (r), root mean square error (RMSE), and bias at the growing season scale across the 18 sites, respectively; (d-f), r, RMSE, and bias at the inter-annual scale across the 11 sites with at least 5 a of continuous observations to ensure statistical robustness, respectively. The information of sampling sites is shown in Table 1.
Fig. 3 Spatial pattern of growing season mean GPP derived from the products (map color) and observations (point markers). (a), GLASS; (b), GOSIF; (c), MOD17; (d), PML_V2.
Fig. 4 Spatial pattern of annual mean GPP derived from the products (map color) and observations (point markers). (a), GLASS; (b), GOSIF; (c), MOD17; (d), PML_V2.
Scale Dataset Mean GPP
(g C/m2)
Standard deviation (g C/m2) CV (%)
Growing season Observed 517.23 423.31 82
MOD17 359.59 241.29 67
PML_V2 378.41 331.70 88
GOSIF 440.20 304.97 69
GLASS 272.38 225.42 83
Annual Observed 605.25 450.45 74
MOD17 400.10 260.07 65
PML_V2 447.59 374.17 84
GOSIF 465.06 315.89 68
GLASS 294.01 230.60 78
Table 2 Coefficient of variation (CV) of observed and product-derived GPP at the growing season and annual scales in the HRB
Fig. 5 Monthly time series of GPP derived from observations (Obs) and products for (a) grassland, (b) cropland, (c) forest land, (d) desert, and (e) wetland ecosystems
Fig. 6 Scatter plots of observed and product-derived GPP across different ecosystems. (a1-a4), grassland; (b1-b4), wetland; (c1-c4), forest land; (d1-d4), desert; (e1-e4), cropland.
Fig. 7 Multi-year annual mean GPP derived from observations (Obs) and products across different ecosystems. (a), grassland; (b), cropland; (c), forest land; (d), desert; (e), wetland. Bars represent standard deviation. Negative lower bounds occur mathematically due to high spatial variance, though actual GPP values are strictly non-negative.
Fig. 8 Comparison of inter-annual variability between observed and product-derived GPP across the 18 sites in the HRB. CV, coefficient of variation.
Fig. 9 Response of product-derived GPP relative biases to inter-annual precipitation anomalies (Z-score) during 2007-2022 across the 18 sites in the HRB
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