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本试验以黄麻圆果种粤圆五号为供试品种,研究了三种密度群体的光合性状和干物质生产的变化。 各生长期不同密度的群体,叶面积和干物质产量都有显著的差异,这是由于株数不同所致;群体内光强分布和净同化率的差异不大;经济系数保持恒定。同一密度的群体,叶面积及干物质产量随生长而变化,主要是由于单株叶面积及干物质产量的变化所致。 在试验范围内,总叶面积的变异范围比平均净同化率的变异范围大,总叶面积与干物质产量呈极显著正相关(r=0.7517),总叶面积的变异是干物质产量不同的主要原因。 因此,高产栽培主要是采用适当的农业技术措施去促进叶面积的有利发展,而在目前生产上采用的种植密度范围内,企图通过改变种植密度来提高净同化率及经济产量系数以致增加干物质产量的可能性是不大的。
In this experiment, Yuhuang No.5 Yueyuan No.5 was used as tested varieties to study the changes of photosynthetic characters and dry matter production of three density groups. There was a significant difference in leaf area and dry matter yield between different density groups at each growth stage due to the different numbers of trees. There was no significant difference in light intensity distribution and net assimilation rate between groups; the economic coefficient remained constant. The same density of population, leaf area and dry matter yield with growth and change, mainly due to single leaf area and dry matter production changes. Within the experimental range, the range of total leaf area variation was larger than that of average net assimilation rate, and the total leaf area was positively correlated with dry matter production (r = 0.7517). The variation of total leaf area was the difference of dry matter yield main reason. Therefore, high-yield cultivation mainly uses appropriate agricultural techniques to promote the favorable development of leaf area, and attempts to increase the net assimilation rate and economic yield coefficient by changing the planting density in the current planting density range so as to increase the dry matter The possibility of production is not big.