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Table 2 Pearson correlation analysis between 8-day Re and the controlling environmental factors across the four grassland ecosystem types

From: Remotely monitoring ecosystem respiration from various grasslands along a large-scale east–west transect across northern China

Grassland type

Period

Rg

(W/m2)

Ta

(°C)

Ts

(°C)

VPD

(h Pa)

P

(mm)

SWC

(%)

EVI

LAI

LSWI

LST

(°C)

Temperate meadow steppe

Growing

− 0.115

0.538a

0.613a

− 0.287b

0.252b

0.351a

0.745a

0.692a

0.704a

0.371a

Dormant

0.411a

0.707a

0.714a

0.685a

0.231b

0.625a

0.378a

0.635a

− 0.269b

0.689a

Entire year

0.570a

0.749a

0.786a

0.520a

0.459a

0.669a

0.869a

0.851a

0.093

0.721a

Typical steppe

Growing

0.073

0.760a

0.707a

− 0.149

0.568a

0.495a

0.721a

0.644a

0.748a

0.669a

Dormant

0.506a

0.554a

0.553a

0.579a

0.269b

0.571a

0.377a

0.451a

− 0.235

0.532a

Entire year

0.644a

0.776a

0.803a

0.581a

0.700a

0.644a

0.861a

0.794a

− 0.011

0.759a

Desert steppe

Growing

0.138

0.171

0.261

0.193

0.197

0.538a

0.499a

0.621a

0.338b

0.110

Dormant

0.086

0.175

0.225

0.056

− 0.119

0.611a

0.296b

0.052

− 0.262

0.175

Entire year

0.370a

0.408a

0.449a

0.421a

0.101

0.475a

0.542a

0.653a

− 0.198

0.392a

Alpine meadow

Growing

− 0.224b

0.535a

0.531a

0.039

0.142

0.397a

0.764a

0.382a

0.739a

0.281b

Dormant

0.275b

0.652a

0.628a

0.379a

0.445a

0.630a

0.577a

0.566a

− 0.206b

0.561a

Entire year

0.265b

0.629a

0.647a

0.325a

0.484a

0.565a

0.837a

0.548a

0.326a

0.531a

  1. a and b mean that correlations are significant at the 0.01 level and 0.05 level, respectively. Rg, Ta, Ts, VPD, P and SWC are observed at the flux tower sites listed in Table 1. Time-series EVI, LAI, LSWI and LST data are derived from the corresponding MODIS products. All these data are at an 8-day interval