Analysis of soil properties and leaf nutrient elements in Carya dabieshanensis woodlands at different elevations of Dabieshan
In order to compare the differences and correlations of soil properties and leaf nutrients in woodlands of Carya dabieshanensis at different elevations of Dabieshan, and to provide references for scientific fertilization and nutrient management, the soil pH, organic matter, available N, available P and available K contents were determined by the acidity meter method, potassium dichromate volumetric method, semi-micro Kjeldahl method, alkaline diffu-sion method, ammonium fluoride hydrochloride leaching-spectrophotometric method and ammonium acetate-flame photometric method, respectively. The N, P, K, Ca, Mg and Zn contents in the soil and leaves were determined by atomic absorption spectrophotometry at different elevations of C. dabieshanensis woodlands, and significance and correlation analyses were performed. The results were: (1) There were significant differences (P < 0.05) in the con-tents of available P, TN, TP, TK, Ca, Mg and Zn in the soils of C. dabieshanensis woodlands at different elevations, and significant differences (P < 0.05) in the contents of K, Ca and Mg in the leaves of C. dabieshanensis. (2) Soil pH decreased with increasing the elevation, while the organic matter and N content increased with increasing elevation in C. dabieshanensis woodlands at different elevations. The K content of leaves increased with elevation, while the contents of Ca and Mg decreased with the elevation, and the remaining nutrients were less affected by the elevation. (3) There were some correlations among nutrient elements of C. dabieshanensis leaves, among soil nutrient elements, and between the leaves and soil, of which, two pairs of soil correlations reached significant levels, four pairs of leaf correlations reached significant levels, and two pairs of soil and leaf correlations reached significant levels (P<0.05). In conclusion, the average pH of C. dabieshanensis woodland was 5.18, which was acidic; the average organic mat-ter content was 5.07％; the available N and available P contents were high, and the available K was scarce; the aver-age contents of trace elements were Mg>Ca>Zn. It was recommended to apply more lime for soil improvement, re-duce the application of nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer, especially potassium fertilizer, and mix chemical fertilizer with organic fertilizer to keep the balance of the soil nutrients.
万方数据
维普
