【摘要】 对北京北部山区板栗林主要养分元素积累与分配的研究结果表明:22年生板栗林的生物量为38638kg/hm2,生物量在干、枝、叶、花、果、果苞及根中的分配比例为52.18∶21.82∶3.70∶2.26∶2.65∶2.07∶15.33。板栗林5种主要养分元素N、P、K、Ca和Mg的贮存量为315.38kg/hm2,不同器官中5种养分元素贮存量排序为干>枝>根>叶>花>果苞>果。土壤层中5种养分元素贮存总量为206427.59kg/hm2,有效养分元素贮存量为16188.29kg/hm2,板栗林5种养分元素贮存量占土壤层5种养分元素贮存总量的0.15%,占有效养分贮存量的1.95%。板栗林对N的富集能力最强,各元素的富集系数排序为N>P>K>Ca>Mg。板栗林生态系统每积累1t干物质需要5种养分元素总量7.17kg,其中对Ca元素的需求量最大,P的最小。更多还原

【Abstract】 The paper studies on the nutrient distribution and accumulation pattern of the Castanca mollissima B1 forest in north Beijing mountain area. Its results show that the total biomass of the Castanca mollissima Bl stand at age 22 in the experimental area is 38 638 kg/hm~2, and it distributed in stem, branch, leaf, blossom, chestnut, seed capsule and root biomass are 20 160 kg/hm~2, 8 430 kg/hm~2, 1 429 kg/hm~2, 873 kg/hm~2, 1 024 kg/hm~2, 800 kg/hm~2 and 5 922 kg/hm~2, respectively. It’s occupying 52.18%, 21.82%, 3.70%, 2.26%, 2.65%, (2.07)%, 15.33% of total biomass, respectively. The five nutrient elements N, P, K, Ca, Mg accumulated in stand crop is 315.38 kg/hm~2, and different nutrient element storage amount greatly varied in the different organs of the Castanca mollissima B1 forests. The sequence of five nutrient elements storage of different organs are follows: truck>branch>root> leaf>flower>seed capsule>chestnut. The five nutrient elements total storage in depth from 0 to 30 cm of the soil is 206 427.59 kg/hm~2, and available nutrient is 16 618.29 kg/hm~2, the crop nutrient elements storage amount just is occupying about 0.15% of the total nutrient store in the soil of five kind nutrient elements, and 1.95% of the available nutrient store in the soil of five kind nutrient elements. And the sequence of enrichment coefficient of the five elements are follows: N>P>K>Ca>Mg. The net production of organic of forest per ton needs a total five elements of 7.17 kg, and the Ca element amount is the biggest, and the P is the smallest among the five nutrient elements.更多还原