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本研究于1984年在蒿属一草原区进行,测定了指定焚烧对蓝丛冰草(AgropyronSpicatum),爱达荷羊茅(Festucai dahoensis)和哥伦比亚针茅(Stipa cotumbiana)种子产量的影响。试验区设在七个焚烧区上,焚烧时间1～5年,试验区附近均有未焚烧的对照区。四个焚烧后一年中的二个区和一个焚烧后三年的试验区上,蓝丛冰草的种子产量(每株植物的种子)高于未焚烧的对照区。一个焚烧后5年的试验区上的爱达荷羊茅的种子产量高于对照区的。但与焚烧后1年或3年的对照区没有显著的差异。焚烧后二年的哥伦比亚针茅的种子产量明显高于对照区的。三种牧草焚烧后结实小花的百分数和每一花序的种子数目均趋向于增大。焚烧后一年蓝丛冰草每一植株生产的花序数目表现出不同的反应,但焚烧后第三年每一植株上生产的花序数目明显高于对照区的(P≤0.05)。焚烧后一年的爱达荷羊茅产生的花序数目少于对照区的,但焚烧五年后的高于对照区的。对于哥伦比亚针茅来说,焚烧后产生的花序数均比对照的高。
This study was conducted in artemisia in a grassland area in 1984 to determine the effects of specified incineration on the seed yield of Agropyron spicatum, Festucai dahurianus and Stipa cotumbiana. The experimental area is set in seven incineration zones with the incineration time of 1 to 5 years and the control zone without incineration near the experimental zone. Seed production (seed per plant) was greater in Betula platyphylla than in the non-incineration control area in four of the four burned areas and in a pilot area after three years of incineration. The yield of seeds of Idaho fescue was higher in the experimental area after 5 years of incineration than in the control area. However, there was no significant difference with the control area of one year or three years after incineration. Two years after incineration, P. acuminatum had a significantly higher seed yield than control area. The percentages of sturdy florets and the number of seeds per inflorescence tended to increase after the three forages were incinerated. One year after incineration, the number of inflorescence produced by each plant showed a different response, but the number of inflorescences produced on each plant in the third year after incineration was significantly higher than that in the control plot (P≤0.05). One year after incineration, the number of inflorescences produced by the fossils of Idaho was lower than that of the control area but higher than that of the control area after five years of incineration. For Colombia, the number of inflorescences produced after incineration was higher than that of the control.