中文摘要：

从在 theXishanping 地点的 AMS 过时的沉积侧面的花粉，植物种子和 phytoliths 显示米饭的耕作可能比 5070 cal 晚不开始。在 Tianshui 的区域的 BP， Gansu 省。它从 5070 ～ 4300 cal.a BP 继续。这是到目前为止最旧并且最西北的记录在过时的中国栽培了米饭，它扩大史前的米饭耕作的已知的区域至少 2 °经度到西方。这发现为重建提供重要证据在 5000 一 BP (一个重要时间时期) 的米饭的耕作区域，和它在东亚的传播历史，在期间过时。

英文摘要：

Pollen, plant seeds and phytoliths from an AMS dated sediment profile at the Xishanping site indicate that the cultivation of rice might start no later than 5070 cal. a BP in the region of Tianshui, Gansu Province. It continued from 5070 to 4300 cal. a BP. This is so far the oldest and the most northwestern record of cultivated rice in Neolithic China, which extends the known region of prehistoric rice cultivation at least 2° longitude to the west. This finding provides important evidence for reconstructing the cultivation region of rice at 5000 a BP （an important time period）, and its spreading history in East Asia, during the Neolithic.