亚高山暗针叶林下缺苞箭竹物质循环研究

本文就西南亚高山暗针叶林下缺苞箭竹的养分含量和动态，枯枝落叶的年凋落量和分解速率等物质循环过程进行了较为系统的研究。结果表明：（１）缺苞箭竹各器官之间的养分含量有很大差异：笋和叶片等幼嫩的新生器官养分含量最高，地下茎和老竹秆的养分含量很低；氮，磷，钾等３种主要营养元素含量动态变化规律在各器官中的表现大体相似。（２）缺苞箭竹林年凋落枯枝落叶量为６７８ｋｇ／ｈａ，归还到土壤的氮，磷，钾，钙和镁等５种主

A Study of Material Cycle of Fargesia denudata in Dark Coniferous Forests in Subalpine Regions

A systematic study is given to the material cycle course of Fargesia denudata in dark coniferous forests such as nutrient content and dynamics,and litter's annual amount and decomposition rate. Ths results are the followings: (l)The nutrient contents varies greatly between all organs of Fargesia de nudata. For example,the nutrient contents of newly grown parts such as shoots and leaves are the highest, while those of the underground and old stalks are very low. The dynamic changes in the contents of the three main nutrient elements such as N,P and K are roughly similar in all organs. (2) Annual amount of litter is 678 kg/ha,and the total amount of the five nutrient elements such as N,P,K,Ca and Mg returned to soil is 118 kg/ha. (3) At present,all nutrient elements are gradually enriched in the nutrient cycle of Fargesia denudata ecosystem.