论文部分内容阅读
我国北方草原,十年九旱,大陆性气候明显。当前草原建设首先遇到水的问题。虽然,水对植物的生长发育有十分重要的作用,但在草原上也常见到另外的景象:有些地方有水但没有草,也没有树;树栽在河边,甚至栽在灌渠两侧,还是活不了;有些牧草种子繁殖场苜蓿结实率低,一些禾本科牧草空秕率高;有些地方出现光秃不毛之地或天然植被群落中呈现明显的生理病害。草原造林中还遇到“一年生、二年黄、三年就死亡”的问题。这是什么原因呢?经过我们多年的调查认为与缺铁有关。土壤的性质与供铁状况我国北方草原,从东北向西南,依次广泛分布着黑钙土、栗钙土、棕钙土和灰棕荒漠土,其中栗钙土连续分布最广。它们的共同特点是具有
The grassland in northern China, nine drought ten years, the obvious continental climate. The current grassland construction first encountered the issue of water. Although water plays a very important role in the growth and development of plants, it is common in grasslands that there are other places where there is water but no grass and no trees. Trees are planted by the river and even planted on both sides of the irrigation canal. Still can not survive; some herbage seed farms alfalfa seed setting rate is low, some grass pasture empty rate is high; in some places appear bare barren or natural vegetation communities showed obvious physiological disease. Prairie afforestation also encountered the “annual, two years of yellow, three years of death” issue. What is the reason? After years of investigation, we think it is related to iron deficiency. Soil Properties and Feeding Status Northern China’s grasslands, from northeast to southwest, in turn are widely distributed in the chernozem, chestnut soil, brown soil and brown desert soil, in which the most widely distributed chestnut soil. What they have in common is that they have