摘要
林木营养元素的积累与分配特征是森林生态系统营养元素生物循环最重要的内容之一,对指导林业生产、提高生态系统的养分利用效率和生产力都有重要的意义。采用标准样地法对广西容县31年生火力楠人工林生态系统3种营养元素(N、P、K)的含量、储存量及其分配特征进行了研究。结果表明,火力楠各器官养分含量由大到小依次为树叶、花果、树根、树皮、树枝、干材;不同器官各养分元素含量均为N>K>P。31年生火力楠人工林生态系统养分储存量为1 152.05kg/hm^2,其中乔木层、灌草层、凋落物层和土壤层养分储存量分别为816.04kg/hm^2、18.85kg/hm^2、44.46kg/hm^2和272.70kg/hm^2,分别占养分总储存量的70.83%、1.64%、3.86%和23.67%。火力楠人工林3种养分元素年净积累量为26.32kg/(hm^2·a),不同器官年净积累量排序为干材>树根>树枝>树叶>树皮>花果。火力楠人工林乔木层每积累1t干物质需要3种养分元素3.86kg,其养分元素利用效率低于秃杉和杉木,但明显高于云南松和红椎人工林。
The storage and distribution feature of nutrient elements in forest is considered as one of the most important parts of the nutrient cycling of forest ecosystem,since it provides reference on forestry production and improve the ecosystem nutrient use efficiency and productivity. With standard sampling method,three primary elements(N,P and K) in 31-year-old Michelia macclurei plantation in Rongxian County of Guangxi Province were studied especially on the contents,storage,annual net accumulation and distribution. The results showed that the nutrient contents in various organs stood in the order of leaves>flower & fruit>bark>branch>root>stem. The contents of nutrient elements in different organs were N>K>P. The total nutrient storage in M. macclurei plantation was 1 152. 05kg/hm^2. The nutrient storage values of the tree, herb and shrub layer, litter layer, and soil layer were816. 04kg/hm^2,18. 85kg/hm^2,44. 46kg/hm^2 and 272. 40kg/hm^2,accounting for 70. 83%,1. 64%,3. 86%and 23. 67%,respectively. The annual net accumulation of three nutrient elements in M. macclurei plantation was26. 32kg/(hm^2·a). The order of annual net accumulation of nutrient elements in different organs of trees were stem>root>branch>leaf>bark. The net production of organic matter per ton needed three elements of 3. 83 kg,and the nutrient utilization efficiency of M. macclurei plantation was lower than that of Taiwania flousiana and Cunninghamia lanceolata forests,but evidently higher than that of Pinus yunnanensis and Castanopsis hystrix plantations.
出处
《西部林业科学》
CAS
2017年第3期125-129,共5页
Journal of West China Forestry Science
基金
国家自然科学基金项目(31160152和31560206)
广西"十一五"林业科技项目(桂林科字2009[08])
关键词
火力楠人工林
氮素
磷素
钾素
积累
分配
MwCelia macclurei plantation
nitrogen
phosphorus
potassium
accumulation
distribution
