Study On The Relationship Between Pinus Tabulaeformis Needle Reddening And Soil Physical And Chemical Properties In Central And Western Inner Mongolia

In recent years,Pinus tabulaeformis has been reddened in central and Western Inner Mongolia.Taking Wulanchabu City and Baotou City in Inner Mongolia as research areas,this paper selected different sample plots and calculated the needle reddening rate of Pinus tabulaeformis in the two areas,further discussed the influence of soil physical and chemical properties on needle reddening of Pinus tabulaeformis in the study area,anddrew the following main conclusions:1.Pinus tabulaeformis needle reddening rate in Baotou city is generally higher than that in Wulanchabu city.The most serious reddening rate of Pinus tabulaeformis needles is 91.11%in Jianshelu area of Baotou city and 64.45%in Qinglin Street area of Wulanchabu city.2.The water content and bulk density of coniferous red Pinus tabulaeformis soil in different plots of Wulanchabu and Baotou City were not significantly different from those of normal Pinus tabulaeformis(P>0.05).The soil moisture content showed a decreasing trend with the increase of soil depth.The comparison between the two areas showed that the soil bulk density and water content of coniferous red Pinus tabulaeformis had little difference,and there was no direct relationship between soil bulk density and water content.3.The soil pH of Pinus tabulaeformis with needle reddening was significantly higher than that of normal Pinus tabulaeformis(P<0.05).The needle reddening of Pinus tabulaeformis was related to the higher pH.4.Compared with normal Pinus tabulaeformis,the content of organic matter in coniferous reddened soil is lower,but the difference is not significant.Organic matter has no direct impact on coniferous reddening of Pinus tabulaeformis.5.Total nitrogen content in 0-60 cm soil of Pinus tabulaeformis was significantly lower than that of normal Pinus tabulaeformis,and total phosphorus content in coniferous Pinus tabulaeformis was lower than that of normal Pinus tabulaeformis,but the difference was not significant(P>0.05).Comparing the two areas,it was found that total nitrogen content in soil was lower,Pinus tabulaeformis needle reddening rate was higher,Pinus tabulaeformis needle reddening was closely related to the lack of total nitrogen content in soil and total phosphorus Irrelevant.6.Potassium ion,sodium ion,calcium ion,magnesium ion and chloride ion in coniferous red Pinus tabulaeformis soil of different types of plots in the two regions did not reach significant level compared with normal Pinus tabulaeformis soil(P?0.05);calcium ion content in coniferous red Chinese pine soil of 0-40 cm was significantly lower(P<0.05)than that of normal Pinustabulaeformis and sulfate ion content was significantly higher(P?0.05)than that of normal Chinese pine.The coniferous reddening rate of Pinus tabulaeformis was higher in low and high sulfate ion roadside tree plots.The coniferous reddening of Pinus tabulaeformis was related to calcium ion deficiency and sulfate ion excess.7.The correlation analysis and factor analysis of soil nutrients in the two regions showed that the high soil pH,the low total nitrogen content in 0-60 cm soil,the low calcium content in 0-40 cm soil and the high sulfate ion content in soil significantly triggered Pinus tabulaeformis needle reddening.