Effects of Light and Nitrogen Addition on the Tree Growth, Needle Morphological and Functions of Picea koraiensis Saplings
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摘要: 筛选出有效促进红皮云杉幼树生长的土壤养分和光照条件,为建立促进红皮云杉幼树生长的管理技术提供科学依据,以黑龙江省佳木斯市孟家岗林场8～10 a生红皮云杉人工幼龄林木为研究对象,采用裂区设计试验方法,设置3种光照条件(全光、0.5郁闭度、0.7郁闭度)下氮添加(每株每年100 g)样地和对照样地,分析光照与氮添加对红皮云杉幼树生长和叶形态功能的影响差异。结果表明,(1)不同光照条件之间,全光条件下树高年生长量最大,全光施肥条件下地径年生长量最大,其次为0.5郁闭度条件;氮添加对树高和地径年生长量影响较小;(2)不同光照条件下,随着郁闭度增加,比叶面积、叶绿素含量增加,叶干物质含量、叶绿素a/b降低,叶养分含量变化不显著;氮添加对叶形态、叶绿素含量和叶养分含量影响不显著。由此可知,相比氮添加,光照对红皮云杉幼树生长、叶形态和光合能力的影响更显著,全光、氮添加条件下幼树具有较大树高和地径年生长量,高径年生长量比最低,氮添加可促进光合效率提高。红皮云杉造林适宜选择全光条件或近似全光条件植苗,造林后可通过氮添加提高幼树光合能力以促进生长。Abstract: To screen soil nutrients and light conditions that effectively promote the growth of Picea koraiensis saplings and to provide a scientific basis for establishing growth promotion techniques for P. koraiensis saplings, a split-zone design experiment was conducted with P. koraiensis saplings plantations of 8-10 years old in Jiamusi City, Heilongjiang Province, using three light conditions（full light, 0. 5 depression, 0. 7 depression） with nitrogen addition（100 g/plant-yr） and control plots to analyze the effects of light and nitrogen addition on growth and leaf morphological function of P. koraiensis saplings. The results showed that:（1）The annual growth of tree height was the highest under full light conditions, and the annual growth of ground diameter was the highest under full light fertilization conditions, followed by 0. 5 degree of depression; the effect of N addition on the annual growth of tree height and ground diameter was small.（2） Between different light conditions, with the increase of canopy density, the specific leaf area and chlorophyll content increased, leaf dry matter content and chlorophyll a/b decreased, and leaf nutrient content did not change significantly;the effect of N addition on leaf morphology, chlorophyll content and leaf nutrient content was not significant. The effect of light on the growth, leaf morphology and photosynthetic capacity of P. koraiensis saplings was more significant than that of N addition, and saplings under full light and N addition had larger annual growth of tree height and ground diameter, and the lowest annual growth ratio of high diameter. Nitrogen addition can promote the photosynthetic efficiency of saplings. The full light condition or nearly full light condition should be selected for the forestation of P. koraiensis, and the photosynthetic capacity of saplings can be improved by nitrogen addition after forestation to promote growth.
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Keywords:
- Picea koraiensis /
- plantation /
- canopy closure /
- nitrogen addition /
- tree growth /
- leaf morphology /
- photosynthetic capacity
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