During the 6th excavation of Chuodun site (E120°50'41",N 31°24'07"),22 pieces of prehistoric farming lands were discovered within 300 m2,Each field was surrounded with bands in between,and ditches or water pools (wells) constructed for irrigation,and some pots wearers (belong to Majiabang culture periods) for water transfer from ditch to field were found in these ditches or fields;more.000 fossil rice grains were screened out,and about 10 to 60 thousands rice phytolith (opal) per gram soil were detected in these ancient lands,all facts above are strong proof indicating these small piece of ancient lands were irrigated paddy fields for rice cultivation by ancient human beings settled in this site.The age of these paddy fields were about 5 907 a BP to 6 280 a BP determined by 14C analysis.It is in Neolithic period and in agreement with Majiabang culture period identified by archaeological method.The small size of each field which only 0.4 m2 to 16 m2 and various shape etc.morphological characteristics were reflect the very low production capacity at that time.A soil monolith (P-01) was studied and described,results indicated that there were two buried paddy soil profile piled together.One is prehistoric paddy profile with age of 6 280 a BP (Majiabang cultural period) in the layer of 103～200 cm depth and the other was ancient paddy profile with age of 3 320 a BP (about Maqiao cultural periods to Early Shang dynasty period) in the layer of 42～103 cm depth.It proved that there were several times of flooding or sea water invade resulting to break off agricultural civilization.Another monolith (P-03) only 15 m apart from the above monolith (P-01),but it was not found the prehistoric paddy profile in the layer of 103～200 cm depth indicating early human beings settled in Chuodun site during that periods had no capacity to use hill land for rice planting yet,because of P-03 monolith was located at the foot of Chuodun hills,they had no technology to level it to construct terrace for rice planting,while the same buried paddy profile in the layer of 40～103 cm aged as Maqiao cultural period to Early Shang dynasty period was there same as in P-01.Both buried paddy soils have developed most of the typical characteristics of modern paddy soils.
曹志洪,杨林章,林先贵,胡正义,董元华,章钢娅,陆彦椿,尹睿,吴艳宏,丁金龙,郑云飞.绰墩遗址新石器时期水稻田、古水稻土剖面、植硅体和炭化稻形态特征的研究[J].土壤学报,2007,44(5):838-847. DOI:10.11766/trxb200610110510 Cao Zhihong, Yang Linzhang, Lin Xiangui, Hu Zhengyi, Dong Yuanhua, Zhang Gangya, Lu Yanchun, Yin Rui, Wu Yanhong, Ding Jinlong, Zheng Yunfei. MORPHOLOGICAL CHARACTERISTICS OF PADDY FIELDS, PADDY SOIL PROFILE, PHYTOLITH AND FOSSIL RICE GRAIN OF THE NEOLITHIC AGE IN YANGTZE RIVER DELTA[J]. Acta Pedologica Sinica,2007,44(5):838-847.复制