2001年冬小麦减产的气象条件分析

2001年山东省东平县冬小麦大幅减产。本文主要从气象角度，从影响冬小麦产量的全生育期间气象条件对照分析，找出减产原因，提出2002年冬小麦生产的几点建议。     

Zircon U-Pb geochronology of tuffite beds in the Baishugou Formation: Constraints on the revision of Ectasian System at the southern margin of the North China Craton

Science China Earth Sciences - The Xiamaling Formation of 1.4–1.35 Ga in Jixian Section and adjoining areas represents a unique Ectasian Period (Mesoproterozoic) sedimentary sequence in the...