施氮对杉木幼苗生长情况及养分分配的影响
2015-07-13高俊威
高俊威
摘要 [目的]对不同施氮水平(高氮、低氮、对照)下杉木幼苗的生长情况以及养分分配进行研究。[方法]测定杉木幼苗的胸径、树高以及叶片、茎、根氮含量。[结果](1)不论是施氮1个月后还是施氮5个月后,各处理下杉木幼苗的胸径和树高大小比为:高氮处理>低氮处理>对照处理。同一时间段下,杉木幼苗的胸径大小比为:高氮处理>低氮处理>对照处理,树高的变化趋势与胸径的一致。(2)同一处理水平下,施氮5个月后各个植物器官氮含量均大于施氮1個月后;同一时间段下,相比于对照CK,高氮和低氮处理都能提高杉木幼苗各组织器官氮含量,如施氮5个月后,叶片高氮和低氮相对于对照分别增加了68.05%,17.71%;茎则是3.52%,183%;根则是16701%,49.83%,其中叶片中氮含量增幅最大。[结论]施氮会明显增加杉木幼苗各个器官氮含量,影响植物养分分配及平衡。
关键词 施氮;杉木幼苗;生长情况;养分分配
中图分类号 S714.8 文献标识码 A 文章编号 0517-6611(2015)15-167-02
Effects of N Application on Nutrient Balance of Chinese fir Seedlings
GAO Junwei
(Wan Quan Forestry Workstation ,Jiangle, Fujiang 353300)
Abstract [Objective]Through control experiment, the Chinese fir seedling growth and nutrient allocation under the different nitrogen levels (high nitrogen and low nitrogen, control) was studied. [Method] Diameter at breast height(DBH), tree height and leaf nitrogen content of Chinese fir seedlings were determined. [Result]The results show that: (1) whether add nitrogen after 1 month or after 5 months, diameter at breast height (DBH)and tree height size of Chinese fir seedlings is: high nitrogen > low nitrogen > control. Under the same time, diameter at breast height size (DBH)of Chinese fir seedlings is :high nitrogen > low nitrogen > control, the change trend of tree height consistent with DBH. (2) under the same treatment, added nitrogen after five months the N content of plant organs were greater than 1 months. Under the same time, compared with CK, high nitrogen and low nitrogen treatment can improve the Chinese fir seedlings organs N content, such as added nitrogen after 5 months, N content leaves under HN and HN relative to the CK respectively increased by 68.05%, 1771%; stems are 352%, 1.83%; root are 167.01%, 49.83%, the N content in the leaves rise fastest, N content in stem growth is minimal. [Conclusion]The results of the study shows that nitrogen can significantly increases the Chinese fir seedlings N content in various organs, affects plant nutrient allocation and balance.
Key words N application; Chinese fir seedlings; Growth situation; Nutrient distribution
杉木是我国重要的造林树种和商品材树种,对解决我国木材供需不足和缓解温室效应有重要作用,其生长迅速,在我国南方自然分布和人工栽培都很广泛[1-2]。氮是植物生长发育所必需的矿质元素之一,是酶、叶绿素、核酸和蛋白质等的重要组成成分,其需求量较大,在不同程度上调控和限制着陆地生态系统中植物的生长发育[3]。为了提高杉木林的林分生产力,施氮成为必然措施。该文旨在研究施氮对杉木幼苗胸径和树高以及氮在叶片、茎、根中分配的影响,了解对氮的需求特性和利用过程,从而了解不同施氮浓度条件下杉木生理生态功能和养分分配情况,以期为日常林业活动中指导林分管理、苗木培育、幼苗施肥提供基础资料。……p>
