Temporal and Spatial Variation Characteristics of Soil Nutrient Content and Microorganism Quantities of Rice Paddy in Core Zone of Yuanyang Terrace

• Yong LIANG, 
• Shuhua FENG, 
• Bo LI, 
• Fangdong ZHAN, 
• Yuan LI, 
• Junping LI, 
• Yongmei HE