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在中科院长白山生态系统定位站,从地表20cm处采集土壤样品,用两种不同形式的氮肥(NO3--N,NH4+-N和NH4NO3)处理土壤样品,用盆栽试验研究了两年生红松苗木受不同浓度N源影响而产生的根际pH变化及其对根际Fe、Mn、Cu和Zn等微量元素的有效性和吸收的影响。结果表明,与对照处理相比,施加铵态氮使根际pH降低,而施加硝态氮则使根际pH增加。根际pH变化的方向与程度取决于N源及施加的浓度。根际pH的变化对根际微量元素的有效性具有显著影响,进而影响到苗木对养分的吸收利用。根际有效Fe、Mn、Cu和Zn的含量与根际pH呈负相关,而苗木叶中Fe、Mn、Cu和Zn含量与根际有效养分含量呈正相关。图5参11。
At the Changbai Mountain ecosystem station of Chinese Academy of Sciences, soil samples were taken from the surface at 20 cm above sea level. Soil samples were treated with two different nitrogenous fertilizers (NO3 - N, NH4 + -N and NH4NO3). The pot experiment was conducted to study the effects of two - Effects of different concentrations of N sources on rhizosphere pH and their effects on the availability and uptake of trace elements such as Fe, Mn, Cu and Zn in the rhizosphere. The results showed that compared with the control treatment, the rhizosphere pH was decreased by the application of ammonium nitrogen while the rhizospheric pH was increased by the application of nitrate nitrogen. The direction and extent of rhizosphere pH changes depend on the source of N and the concentration applied. Rhizosphere pH changes have a significant effect on the availability of trace elements in the rhizosphere, thus affecting the seedling nutrient uptake and utilization. The contents of available Fe, Mn, Cu and Zn in the rhizosphere soil were negatively correlated with the rhizosphere pH, while the contents of Fe, Mn, Cu and Zn in the seedling leaves were positively correlated with the available nutrients in the rhizosphere. Figure 5 Senate 11.