毛果苔草湿地营养元素的积累、分配及其生物循环特征

毛果苔草(Carex lasiocarpa)湿地地上部分积累量小于地下部分的积累量,在地上几个构件中,叶片比叶鞘积累量大,而穗的积累量最小;地下部分中细根比根茎的积累量大.土壤分室营养元素贮量在系统的各分室中占绝对优势,毛果苔草湿地土壤中各种营养元素总贮量的顺序为K＞Fe＞N＞Ca＞P＞Mg＞Mn＞Zn＞Cu;它们的吸收系数的排序是Mn＞N＞P＞Zn＞Mg＞Cu＞Ca＞Fe＞K;几种营养元素的利用系数的排序是Mn＞N＞P＞Zn＞Mg＞Cu＞Ca＞Fe＞K;几种营养元素的循环系数的排序为Ca＞K＞Mg＞N＞P＞Mn＞Zn＞Cu＞Fe;因此,该系统中钙、钾的存留比例最小,而流动性较大,而铁则相反,存留比例大,流动性较小.

The accumulation,allocation and biological cycle of the nutrient elements in Carex lasiocarpa wetland

The accumulation quantity of overground part is less than its underground part in the Carex lasiocarpa wetland, In the component of the overground part,the accumulation quantity of leaf component is bigger than its sheath component, and the accumulation of the spike component is the least. In the component of the underground part,the accumulation quantity of redicula component is bigger than its rhizoma componen; The nutrient element storage of soil dispart is predominant among the different disparts. The order of storage quantity of the nutrient elements in the soil of Carex lasiocarpa wetland is as following: K>Fe>N>Ca>P>Mg>Mn>Zn>Cu.The order of the absorbance index of the wetland is Mn>N>P>Zn>Mg>Cu>Ca>Fe>K. The order of the utilization factor of this wetland is: Mn>N>P>Zn>Mg>Cu>Ca>Fe>K; The order of the cycle index of Carex lasiocarpa wetland is Ca>K>Mg>N>P>Mn>Zn>Cu>Fe.The remaining proportion of Ca, K in the ecosystem is the least, and its fluidity is bigger, The remain proportion of Fe in the ecosystem is bigger than other elements and its fluidity is small.