Mean values of environmental factors of 130 historical sites and 147 recent sites examined in this study.
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For each environmental factor, mean values of historical and recent datasets in 31 grids (see Figure 1) were compared with paired-sample t-tests. Note: A: the preceding crops in fields with wet-dry crop rotation were wet rice, while those in lands with dry crop rotation were dry crops such as soybean, corn, and cotton. “*”: PNS”: not significant.
创建时间：
2015-12-02
