陇东黄土高原塬区冬小麦干物质增长规律分析

Analysis of Dry Matter Accumulation of Winter Wheat on Loess Plateau of Long Dong

用Logistic生长曲线对陇东黄土高原塬区冬小麦干物质积累进行不同气候年型的模拟分析表明:干物质积累在拔节后到乳熟期呈直线递增趋势。增长速率最快时期在抽穗前后,呈单峰型曲线。在不同的气候年型下干物质累积量与降水量、日照时数、≥0℃积温的关系均达极显著水平,而干物质生长率仅在少雨年与气象要素呈显著关系,其它两种气候年型下相关不显著。

The dry matter accumulation of winter wheat in the different climate year types on Loess Plateau of Longdong was analyzed with Logistic growth curve. The results showed that the accumulation of dry matter had a linear increase from jointing to milky ripe stage. The biggest accumulating rate occurred around the heading period with a one-peak curve. The amount of dry matter accumulation in the different climate year types was significantly (P=0.01) related to the precipitation, radiation hours and accumulated temperature (≥0℃), whereas accumulating rate was significantly related to the climate factors only in the climate year type with less precipitation.