Effects of Fertilization on Soil Nutrient Content of Potted Chinese Fir Seedling
Zhang Jianguo~ 1 Sheng Weitong~ 1 Xiong Youqiang~2 Wan Xirui~2 (1.Research Institute of Forestry, CAF Key Laboratory of Forest Silviculture of the State Forestry Administration, Beijing 100091;2. Experimental Center of Subtropical Forestry, CAF Fenyi 336600)
The purpose of this study was to illustrate the effects of some fertilizers on the soil nutrient content of one_year_old (1 a) and two_year_old (2 a) potted seedlings. The results showed that: on the N_deficient and P_deficient acidic soil, with the increase of N fertilizer on 1 a seedlings, obvious changes in the soil nutrient contents were observed. pH and total potassium content (TK) went down, while the concentration of total nitrogen (TN), hydrolytic nitrogen (HN), water_soluble calcium (Ca) and water_soluble magnesium (Mg) rose up. The variation of total phosphorus (TP), availabe_P(AP), rapidly_available potassium (AK) was unnoted. Some of 1a seedlings were damaged by the overhigh of N concentration. For 2 a seedlings, TN, HN, Ca, and Mg in soil went upward with the increase of N fertilizer, while TK, AK and pH dropped. The change of organic matter and TP was not significant. Differed from 1 a seedlings,the decrease of pH activated the occluded phosphorus and led to the increase of AP, which was good for the growth of the 2 a seedlings. Under the N_deficient and P_deficient conditions, TP, AP, AK and pH went up, while TK, Ca and Mg fell down. But no remarkable change took place for organic matter and HN. The correlation analysis between soil nutrient content and growth indexes indicated that the application of P fertilizer eliminated the P stress and accelerated the growth rate of the 1 a seedlings. For the 2 a seedlings, the gradual increase of P fertilizer made TP, AP ascend and TK descend, but pH, organic matter, TN, AK, Ca and Mg had no notable change. The correlation analysis showed that the use of P fertilizer caused soil nutrition imbalance instead of improving the growth status. The 2 a seedlings were still in the situation of nutrition deficiency. On the N_adequate and P_deficient soil, with the increase of NP compound fertilizer applied to the 2 a seedlings, TN, TP, HN and AP in seedlings climbed up and AK went down. According to the correlation analysis, application of NP compound fertilizer to the 2 a seedlings could enhance the absorption and utilization of AK, resulting the transference of photosynthetic production from leaves to roots, therefore accelerate the growth rate greatly.
【Fund】： 国家自然科学基金重点项目;; 国家林业局林木培育重点实验室基金项目(03)资助。
【CateGory Index】： S791.27
【CateGory Index】： S791.27