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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 typePeriodRg
(W/m2)
Ta
(°C)
Ts
(°C)
VPD
(h Pa)
P
(mm)
SWC
(%)
EVILAILSWILST
(°C)
Temperate meadow steppeGrowing− 0.1150.538a0.613a− 0.287b0.252b0.351a0.745a0.692a0.704a0.371a
Dormant0.411a0.707a0.714a0.685a0.231b0.625a0.378a0.635a− 0.269b0.689a
Entire year0.570a0.749a0.786a0.520a0.459a0.669a0.869a0.851a0.0930.721a
Typical steppeGrowing0.0730.760a0.707a− 0.1490.568a0.495a0.721a0.644a0.748a0.669a
Dormant0.506a0.554a0.553a0.579a0.269b0.571a0.377a0.451a− 0.2350.532a
Entire year0.644a0.776a0.803a0.581a0.700a0.644a0.861a0.794a− 0.0110.759a
Desert steppeGrowing0.1380.1710.2610.1930.1970.538a0.499a0.621a0.338b0.110
Dormant0.0860.1750.2250.056− 0.1190.611a0.296b0.052− 0.2620.175
Entire year0.370a0.408a0.449a0.421a0.1010.475a0.542a0.653a− 0.1980.392a
Alpine meadowGrowing− 0.224b0.535a0.531a0.0390.1420.397a0.764a0.382a0.739a0.281b
Dormant0.275b0.652a0.628a0.379a0.445a0.630a0.577a0.566a− 0.206b0.561a
Entire year0.265b0.629a0.647a0.325a0.484a0.565a0.837a0.548a0.326a0.531a
  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