Characteristic research of canopy structure and micro-environment of maize colony planted in double line at one width ridge
2005
Wu Zhihai, Wang Xiaohui,Chen Zhanyu
chinois. 采用大垄双行种植方式，对3种株型玉米分别在3种密度下建立不同的群体冠层结构：平展型品种“吉单159”密度分别为4.0，4.5，5.0万株／ha，中间型品种“农大3138”密度分别为4.5，5.0，5.5万株／ha，紧凑型品种“四密25”密度分别为5.5，6.0，6.5万株／ha，并测定了群体冠层结构及其微环境特性。结果表明：3种株型玉米大垄双行种植的中层叶片的叶向值比正常种植的玉米叶向值小约3.0，“吉单159”和“农大3138”在大喇叭口期至抽雄期叶宽比正常种植的玉米宽0.5～1.0cm；叶面积指数（LAI）在抽雄开花期至灌浆期比正常种植的玉米大0.1～0.3；大垄双行种植的玉米群体比正常种植的玉米群体中层叶片的透光率提高约10％，中下层叶片接受的PFD平均比对照增加100～160μE/（m. /s）；冠层内CO2浓度有一定增加，具有明显的冠层和微环境优势。试验表明，大垄双行种植方式可使“吉单159”和“农大3138”的种植密度比正常密度增加0.5万株／ha。
Afficher plus [+] Moins [-]anglais. Three varieties of maize colony were planted by double line at one width ridge. The planting density of Jidan159 was 4.0,4.5 and 5.0 × 104/ha and Nongda3138 was 4.5,5.0 and 5.5 × 10. /ha, then Simi25 was 5.0,5.5 and 6.0 x 10. /ha. Their micro-environment was tested. The results showed that leaf orientation value of middle leaf in width ridge was 3.0 smaller than the ck in three varieties of maize, and the leaf width of Jidan159 and Nongda3138 was 0.5 - 1.0 cm wider than the ck from booting to heading stage, but the leaf area index was 0.1 - 0.3 larger than the ck from heading to filling stage, penetration photo rate of middle layer leaf in width ridge was 10% more than the ck, and the accepted PFD of middle and lower leaf was 100 - 160 μE/（m. /s） more than the ck. Carbon dioxide concentration of canopy increased and is of predominant advantages in canopy structure and micro-environment. The experiment results showed that the planting density of Jidan159 and Nongda3138 in width ridge was 0.5 × 10. /ha more than the ck.
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