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    盛后财, 蔡体久, 琚存勇. 小兴安岭白桦林降水转化过程元素特征分析[J]. 北京林业大学学报, 2015, 37(2): 59-66. DOI: 10.13332/j.cnki.jbfu.2015.02.009
    引用本文: 盛后财, 蔡体久, 琚存勇. 小兴安岭白桦林降水转化过程元素特征分析[J]. 北京林业大学学报, 2015, 37(2): 59-66. DOI: 10.13332/j.cnki.jbfu.2015.02.009
    SHENG Hou-cai, CAI Ti-jiu, JU Cun-yong. Element characteristics in the precipitation conversion process in Betula platyphlla forest of Xiaoxing’an Mountains, northeastern China[J]. Journal of Beijing Forestry University, 2015, 37(2): 59-66. DOI: 10.13332/j.cnki.jbfu.2015.02.009
    Citation: SHENG Hou-cai, CAI Ti-jiu, JU Cun-yong. Element characteristics in the precipitation conversion process in Betula platyphlla forest of Xiaoxing’an Mountains, northeastern China[J]. Journal of Beijing Forestry University, 2015, 37(2): 59-66. DOI: 10.13332/j.cnki.jbfu.2015.02.009

    小兴安岭白桦林降水转化过程元素特征分析

    Element characteristics in the precipitation conversion process in Betula platyphlla forest of Xiaoxing’an Mountains, northeastern China

    • 摘要: 为了探究小兴安岭白桦林生态系统在降水转化过程中养分循环及养分平衡的变化特征,采用生态系统野外长期定位观测和采样的方法,并利用ICP发射光谱分析仪对小兴安岭白桦林穿透雨、树干径流以及林外雨中的K、Ca、Si、Mg和Mn共5种养分元素进行了测定,结合白桦林对大气降雨的截留再分配比例,计算了白桦林内各元素的输入量,结果表明:1)大气降雨中各养分元素年均质量浓度Ca为最高(10.807 mg/L),Mn最低(0.069 mg/L),其排序为Ca>K>Si>Mg>Mn;大气降雨中养分输入量排序与养分年均质量浓度有相同排序规律;2)穿透雨与树干径流中的各元素年均质量浓度规律一致,均为Ca>K>Mg>Si>Mn;与大气降雨相比,穿透雨和树干径流中养分元素的年均浓度均有不同幅度的增长;3)大气降雨中除Ca元素外,其他元素的变异系数均大于1,其中K的变异系数最大(1.514),Ca的变异系数最小(0.827);白桦林穿透雨、树干径流中Mg元素变异系数均为最大,分别为0.989和0.827,最小变异系数分别为Si(0.46)和Mn(0.459);与大气降雨相比,穿透雨和树干径流中各养分元素的变异系数均小于降雨中该元素的变异系数;4)白桦林各元素年净输入量为K>Mg>Si>Mn>Ca,且Ca元素的年净输入量为负值。

       

      Abstract: Birch forest as secondary forest after the original natural forest was disturbed plays an important role in northeastern China since it occupies about 20% of the total forest area. To explore the variations of nutrient cycling and nutrient balance in precipitation conversion process in birch forest ecosystem of Xiaoxing’an Mountains, net input of each nutrient element was calculated. The calculation was based on the implementation of long-term fixed-location observation and sampling in the field. We measured the contents of five nutrient elements (K, Ca, Si, Mg and Mn) in precipitation, throughfall, and stemflow using the analyzer of ICP color spectrum, combining the allotment of rainfall water. The results revealed that: 1) in precipitation, the average concentration of each nutrient was significantly different. The concentration of Ca was the highest with 10.807 mg/L and that of Mn only 0.069 mg/L as the lowest. The contents of nutrients in precipitation were in the order as Ca>K>Si>Mg>Mn, the same order as for the input of nutrients in precipitation. 2) The yearly average concentration of each element in throughfall and stemflow had the same pattern of Ca>K>Mg>Si>Mn. The contents of nutrients in throughfall and stemflow had increases with different amplitudes if compared to precipitation. 3) All coefficients of variation (CV) in precipitation were higher than 1 except that for Ca, and the greatest CV in precipitation was 1.514 for K and the smallest 0.827 for Ca. The greatest CV for K was 0.989 in throughfall and 0.827 in stemflow. In throughfall, the smallest CV was 0.46 for Si and in stemflow 0.459 for Mn. The CVs in throughfall and stemflow were all smaller than those in precipitation.4) The pattern for the net input amounts of each element in the birch forest was as follows: K>Mg>Si>Mn>Ca. Furthermore the net input amount of Ca in birch forest was negative.

       

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