| 杉木及其人工林自身特性对长期立地生产力的影响 |
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| 引用本文： | 盛炜彤,范少辉.杉木及其人工林自身特性对长期立地生产力的影响[J].林业科学研究,2002,15(6):629-636. |
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| 作者姓名： | 盛炜彤 范少辉 |
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| 作者单位： | 中国林业科学研究院林业研究所,北京,100091 |
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| 基金项目： | 1997～2000年国家自然科学基金资助重点项目"杉木桉树人工林长期生产力保持机制的研究"(39630240) |
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| 摘 要： | 本文系统地研究并综合了有关杉木及其人工林自身特性对长期立地生产力的影响的研究资料,认为杉木及其人工林自身的特性存在许多对地力维护不利的因素：（1）杉木凋落物发生晚,大量凋落物发生在14－15a前后;（2）杉木枯死枝叶具宿存特性,10－15a期间大部分枯死枝叶在树上,影响枯死枝叶的分解;（3）杉木凋落物养分含量低,如N含量只有阔叶树的30％－50％,因此枯落物营养元素积累低;（4）凋落物分解速率慢,分解速度在45％以下,而宿存于树上的枯死枝叶分解速率更慢;（5）杉木为速生树种,尤其在15a年前生长量大,吸收养分多,而养分归还少,杉木人工林养分循环速率不及40％;（6）杉木人工林培育密度较大,在15a前很少有林下植物生长,在20a后才有较好的林下植被发育,人工林长期处在单一的群落结构,很难发挥林下植被对地力的维护和改良作用。从现有的研究资料看,杉木及其人工林自身对地力维护有不利影响,是引起杉木林地土壤肥力及长期生产力下降的重要因素之一。
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| 关 键 词： | 杉木 杉木人工林 地力维护能力 立地生产力 土壤肥力 |
| 文章编号： | 1001-1498(2002)06-0629-08 |
| 收稿时间： | 2002/8/20 0:00:00 |
Impact of Growth and Development Characters of Chinese Firand Its Plantation on the Long-term Site Productivity |
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| SHENG Wei-tong and FAN Shao-hui.Impact of Growth and Development Characters of Chinese Firand Its Plantation on the Long-term Site Productivity[J].Forest Research,2002,15(6):629-636. |
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| Authors: | SHENG Wei-tong and FAN Shao-hui |
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| Institution: | Research Institute of Forestry, CAF, Beijing 100091, China;Research Institute of Forestry, CAF, Beijing 100091, China |
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| Abstract: | A systematic study was made on the impact of the growth and development characters of Chinese fir (Cunninghamia lanceolata) and its plantation on the long term site productivity. The results show that many growth and development characters of Chinese fir and its plantation have negative impact on the maintenance of site productivity, i.e. (1) the falling of needles and branches occur lately and mainly concentrative occurs when it is 14-,16 years old in the plantation. (2) the dead needles and branches keep staying on stem long and most of them keep staying on stem when it is 13-,15 years old, which results in non immediate decomposition of dead needles and branches. (3) the litters of Chinese fir contains less nutrients, e.g. the content of N is only 30%-,50% of that in the litters of broad leaved trees that results in less back of the nutrients to the soil in Chinese fir plantations. (4) the decomposition rate of Chinese fir litters is relatively slow with annual decomposition rate below 45%. (5) as a fast growing tree species Chinese fir needs much nutrients to grow especially before 15 years old, which is not compatible by the amount of nutrients given back from the decomposition of litters so that the nutrient cycling rate is less than 40% in Chinese fir plantations. (6) since the density is high for Chinese fir plantation, little or no undergrowth vegetation develop in the Chinese fir plantation before thinning at around 15 years old that results in no contribution of undergrowth to the improvement of soil nutrient status until the plantation grows to 20 years old. It is concluded that the growth and development characters of Chinese fir and its plantation are also the important factors resulting in the degradation of soil fertility or the reduction of long term site productivity in Chinese fir plantation. |
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| Keywords: | Cunninghamia lanceolata Chinese fir plantation maintenance of soil fertility long-term site productivity |
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