【摘要】 对川西亚高山 3个不同箭竹群落枯枝落叶层现存量及生物化学特性作了初步研究 ,结果表明 :(1)枯枝落叶层贮量 :箭竹 -冷云杉林 (4 6 .3× 10 3kg/hm2 ) >箭竹 -桦木 -冷云杉林 (2 5 .8× 10 3kg/hm2 ) >箭竹 -桦木林 (6 .5× 10 3kg/hm2 )。(2 )各林型枯枝落叶层营养元素贮量 (kg/hm2 ) :箭竹 -冷云杉林为 N 5 5 3.14 ,P 5 4 .6 3,K 16 4 .75 ,Ca 6 0 6 .12 ,Mg 12 5 .78,箭竹 -桦木 -冷云杉林为 N2 6 9.4 5 ,P 2 3.6 1,K 96 .31,Ca 36 7.0 4 ,Mg 79.0 8,箭竹 -桦木林为 N 6 8.6 9,P 7.73,K 2 7.6 4 ,Ca 2 1.6 6 ,Mg 11.4 5 ;各元素贮量分布规律箭竹 -冷云杉林和箭竹 -桦木 -冷云杉林为 Ca>N>K>Mg>P,箭竹 -桦木林则是 N>K>Ca>Mg>P。 (3)箭竹 -冷云杉林和箭竹 -桦木 -冷云杉林枯枝落叶层有机质 (如有机碳、粗蛋白、粗脂肪、粗纤维、无氮浸出物等 )含量分布格局均为未分解凋落物层 (L ) >半分解层 (F) >腐殖质层 (H) ,有机质贮量分布格局为 H层 >F层 >L层 ,箭竹 -桦木林各亚层有机质含量及贮量均为 L - F层 >H层 ;箭竹 -桦木林、箭竹 -桦木 -冷云杉林和箭竹 -冷云杉林枯枝落叶层有机质平均分解率分别为38.15 %、2 3.5 4 %、19.14 %。 (4 )各林型枯枝落叶层微生物 (细菌、真菌、放线菌 )数量、酶 (酸性磷酸?更多还原

【Abstract】 The standing pool, biological and chemical properties of the forest floor in three subalpine bamboo communities in western Sichuan were studied in this paper . Results showed that the standing pool was in order of the bamboo-fir-spruce forest （46.3×10³ kg/hm²） > bamboo-fir-spruce-birch forest （25.8×10³ kg/hm²）> bamboo-birch forest （6.5×10³ kg/hm²） at first. At the same time, the pool (kg/hm²) of elements was 553.14 （N）, 54.63 （P）, 164.75（K）, 606.12 （Ca）, 125.78 （Mg） for the bamboo-fir-spruce-birch forest, 269.45 （N）, 23.61 （P）, 96.31 （K）, 367.04 （Ca）, 79.08 （Mg） for the bamboo-fir-spruce-birch forest, and 68.69 （N）, 7.73 （P）, 27.64 （K）, 21.66 （Ca）, 11.45 （Mg） for the bamboo-birch forest. The order of elements was in sequence of Ca > N > K> Mg > P in the bamboo-fir-spruce forest and the bamboo-fir-spruce-birch forest, but N> K > Ca > Mg> P in the bamboo-birch forest. Secondly, the content of the organic matter （such as organic carbon, crude protein, crude fat, crude cellulose, free-nitrogen extracts and so on） in the different layers in the forest floor had the order of the litter layer （L） > fermentation layer （F） > humus layer （H） in the bamboo-fir-spruce forest and the bamboo-fir-spruce-birch forest, but the pool of the organic matter had H > F > L in both of the forests. The content and pool of the organic matter in the different layers of the forest floor were in order of L-F layer > H layer in bamboo-birch forest. Furthermore, the average decomposed rates of the organic matter in the forest floor of the bamboo-birch forest, the bamboo-fir-spruce-birch forest and the bamboo-fir-spruce forest were 38.15%, 23.54%, 19.14% respectively. Thirdly, the quantities of microbes （Bacteria, Actinomyces, Fungi） and the activities of enzymes （such as acidphosphatases, proteinase, invertase, catalase, polyphenol oxidase and so on） in the forest floor were in order ofF>L>Hin the bamboo-fir-spruce forest and the bamboo-fir-spruce-birch forest, but H > L-F in the bamboo-birch forest. In a word, the results suggests that with the succession from the bamboo-birch forest to bamboo-fir-spruce-birch forest, finally to the bamboo-fir-spruce forest, the microbial quantity, the enzymatic activity and the average decomposed rate of the forest floor will decrease but the pool of the organic matter and the nutrient elements in the forest floor accumulate gradually, implying that the nutrient cycling rate decrease gradually over the succession processes.更多还原