公告信息：
為合理調整半干旱區玉米不同生育時期的田間管理手段，以提高高種植密度下玉米植株群體產量及群體光能利用效率提供理論依據。[方法]以4個玉米品種（鄭單958、先玉335、農華101、吉單198）為試驗材料，在吉林省半干旱區，針對種植密度（3.0萬、4.5萬、6.0萬、7.5萬、9.0萬株/hm2）與灌漿期各光合因素間的相互關系進行了試驗，對灌漿期各時間段主要限制因素進行分析。[結果]在灌漿期內不同時間段，種植密度對蒸騰速率、CO2氣孔導度、葉綠素、葉面積指數（LAI）的影響不同。在抽雄期至吐絲后45 d，種植密度與葉片蒸騰速率、葉綠素含量、雌穗干重呈顯著或極顯著負相關，與LAI呈極顯著正相關。[結論]在吉林省半干旱區，在一定種植密度范圍內，增加種植密度，有利于調節各光合因素間的相互作用，促進光、溫、氣等資源的利用，有助于提高凈光合速率和增加光合物質的合成。
關鍵詞 半干旱地區；種植密度；凈光合速率；葉綠素含量
中圖分類號 S513 文獻標識碼 A 文章編號 0517-6611（2014）25-08526-04
Abstract [Objective] The aim was to provide a theoretical basis for improving yield and light energy use efficiency of maize plants population under high planting density by reasonably adjusting the field management method of maize different growth period in semiarid region. [Method] The trail was carried out to study the relationship between planting density （3.0×104， 4.5×104， 6.0×104， 7.5×104， 9.0×104 plants/hm2） and the photosynthetic factors at filling stage taking four maize varieties（Zhengdan 958， Xianyu 335， Nonghua 101 and Jidan 198） as materials in Jilin semiarid area， and the major limiting factors of each period at filling stage were analyzed. [Result] The planting density had different effects on transpiration rate， CO2 stomatal conductance， chlorophyll， leaf area index（LAI） at each period of filling stage. From tasseling stage to 45 days after silking stage， planting density had significant or very significant negative correlation with leaf transpiration rate， chlorophyll content， female spike dry weight， and had very significant positive correlation with LAI. [Conclusion] Increasing planting density in the certain scope， is conducive to the interaction among the factors adjusting the photosynthesis， such as light， temperature， gas and the other resources， and it helpful to improve the net photosynthetic rate， increase the synthesis of photosynthetic matter.
Key words Semiarid area； Planting density； Net photosynthetic rate； Chlorophyll content
半干旱區玉米不同種植密度下光合特性研究
來源：環球糧機網發布時間：2015-06-15 13:14:28
