The Distribution Rule Of Alpine Meadow Soil N/P And Its Relevant Factors In The Qinghai-tibet Plateau

Nitrogen and phosphorus as the needs of the vegetation in the nature of the basic nutrients,in plant growth and various physiological regulation function to display important function,there are some important links between the two.Nitrogen and phosphorus ratio is an important chemical metrological characteristics of aquatic plants,also in terrestrial plants growth and development plays an important role in indicating that it can reveal terrestrial plant community in a certain extent,nitrogen-fixing organisms symbiotic and the nitrogen fixation of symbionts.And it can reflect the land plants is limited by environmental factors.This study based on the qinghai-tibet plateau alpine meadow plant community investigation,on the qinghai-tibet plateau alpine meadow soil nitrogen to phosphorus ratio distribution of make some simple summary;And to explore the related factors affecting the law of the.Finally be not affected by the artificial grassland in the qinghai-tibet plateau sample area within the scope of study,nitrogen and phosphorus than numerical overall present high east,the west is low,and U change trend in latitudinal direction of distribution pattern,roughly in the middle region distribution is uneven and has no obvious change of gradient;Sample area of nitrogen and phosphorus than numerical and decreased with the increase of soil depth,and meadow of land between the nitrogen and phosphorus increased with the increase of the depth of the larger than the changes in,and grassland samples change in the ratio of nitrogen and phosphorus increased with the increase of depth shows the change trend of twin peaks model;Than first increases with the increase of altitude,nitrogen and phosphorus,stabilized after at high altitude area,change with the increase of altitude first becomes big small trends;Soil nitrogen and phosphorus ratio has positive correlation with temperature,at the same time has a strong positive correlation with organic matter,and soil bulk density has a strong negative correlation relationship;Meadow to soil nitrogen and phosphorus are negatively related with pH,pH and grassland samples than there is no obvious correlation between soil nitrogen and phosphorus.If you want to know about situation of soil nitrogen and phosphorus in the sample arearatio,can from the soil bulk density and soil organic matter;To improve soil nitrogen and phosphorus ratio situation,except directly applying nitrogen or phosphorus fertilizer,organic manure is a more environmentally friendly and efficient choice.