氮沉降对毛竹生态化学计量学特征的影响

发布时间：2018-03-06 17:16

本文选题：氮沉降　切入点：毛竹　出处：《浙江农林大学》2016年硕士论文　论文类型：学位论文

【摘要】：生态化学计量学为认识植物响应环境变化提供了一条重要途径。氮沉降增加作为全球变化的重要现象之一,已经并将继续对植物生态化学计量特征产生影响。毛竹(Phyllostachys edulis)是我国分布最广、栽培和利用历史最悠久、经济价值最高的竹种。近年来随着效益林业的推进,我国有超过一半面积的毛竹林实施了集约经营。目前,关于氮沉降对不同年龄毛竹各个器官的生态化学计量特征的影响人们仍知之甚少。本研究以亚热带集约经营毛竹林为研究对象,研究不同强度的模拟氮沉降对不同年龄毛竹叶片、枝、秆的生态化学计量特征的影响。实验结果表明:(1)模拟氮沉降处理显著提高了毛竹林叶片的C、N、P含量(P0.05),而且对C、P含量的促进作用随氮沉降强度而增强。同一模拟氮沉降强度处理下,不同年龄毛竹叶片C、N、P含量没有表现出明显的规律性变化。毛竹年龄对C、N、P以及C∶N、N∶P均有极显著影响(P0.01),对C∶P无显著影响。模拟氮沉降强度与毛竹年龄的交互作用对毛竹叶片的C、N、P含量以及C∶N、C∶P、N∶P均有极显著影响(P0.01),在2年的模拟氮沉降后,实验区域毛竹林的生长仍表现为N限制。(2)3龄毛竹竹秆的C、N含量在总体上均表现出随氮沉降强度增加而增加的趋势,P表现出随氮沉降强度增加而降低。1龄毛竹竹秆的C、N、P含量在总体上均表现出随氮沉降强度增加而增加的趋势。氮沉降水平对毛竹竹秆C含量无显著影响,对N、P含量及C∶N、C∶P、N∶P均有极显著的影响(P0.01)。同一模拟氮沉降强度处理下,不同年龄毛竹竹秆的C、N、P含量没有表现出明显的规律性变化。毛竹年龄对毛竹竹秆C含量有显著影响(P0.05),对N、P含量及C∶N、C∶P、N∶P均有极显著的影响(P0.01)。氮沉降水平与年龄的交互作用对毛竹竹秆的C含量有显著影响(P0.05),对N、P含量及C∶N、C∶P、N∶P均有极显著的影响(P0.01)。(3)3龄毛竹竹枝的C、N、P含量在总体上均表现出随氮沉降强度增加而降低的趋势,1龄毛竹竹枝的N、P含量在总体上均表现出随氮沉降强度增加而增加的趋势,C含量保持相对稳定。同一模拟氮沉降强度处理下,不同年龄毛竹竹枝的C、N、P含量没有表现出明显的规律性变化。毛竹年龄对竹枝N含量有显著影响,对竹枝P含量及N∶P无显著影响。氮沉降水平与年龄的交互作用对毛竹竹枝的C、N、P含量及C∶N、C∶P、N∶P均有极显著影响(P0.01)。
[Abstract]:Eco-chemometrics provides an important way to understand the response of plants to environmental changes. Nitrogen deposition is one of the important phenomena of global change. Phyllostachys edulis (Phyllostachys edulis) is the most widely distributed, cultivated and utilized bamboo species in China, and has the highest economic value. More than half of China's bamboo forests are intensively managed. At present, Little is known about the effect of nitrogen deposition on the ecological stoichiometric characteristics of different organs of Phyllostachys pubescens at different ages. In this study, intensive management of Phyllostachys pubescens forest in subtropics was studied. The effects of simulated nitrogen deposition with different intensities on bamboo leaves and branches of different ages were studied. The experimental results showed that the simulated nitrogen deposition treatment significantly increased the content of N N P in leaves of Phyllostachys pubescens forest, and the promotion of C N P content increased with the intensity of nitrogen deposition. There was no significant regular change in the content of C ~ (+) N ~ (+) P in bamboo leaves of different ages. The age of Phyllostachys pubescens had a very significant effect on Cnu P and C _ (1) N ~ (+) N _ (1) P, but had no significant effect on C _ (1) P. The interaction between simulated nitrogen deposition intensity and bamboo age had a significant effect on bamboo (Phyllostachys pubescens). The contents of C ~ (2 +) N ~ (+) P in leaves and C _ (1) N _ (1) P in C _ (2) N _ (10) C _ (10) N _ (1) P had a significant effect on P _ (0.01). The growth of Phyllostachys pubescens forest in the experiment area is still shown as N limitation. The content of C ~ (+) N in bamboo stalks of the 3rd instar of Phyllostachys pubescens has a trend of increasing with the increase of nitrogen deposition intensity, and P is decreasing with the increase of nitrogen deposition intensity. The content of C ~ (2 +) in bamboo stalk increased with the increase of nitrogen deposition intensity, and the nitrogen deposition level had no significant effect on the C content of bamboo stalk. Under the same simulated nitrogen deposition intensity treatment, the content of N + P and the content of N / N / N / P were significantly affected by P0. 01% P = 0. 01, respectively, under the same simulated nitrogen deposition intensity. The C content of bamboo stalk of different age has no obvious regular change. Bamboo age has significant influence on the C content of bamboo stalk (P0.05N), on the content of Nu P and the content of C ~ (+ +) N ~ (2 +) N ~ (2 +) N ~ (2 +), and on N ~ (2 +) content of bamboo stalk (P _ (0.01)). The interaction between nitrogen sedimentation level and age is very significant. The effect on the C content of bamboo stalk was significant (P0.05), and on the content of N ~ + P and C _ (10) N _ (1) C _ (10) P _ (N) N _ (1) P _ (1) N _ (10) P _ (N) in the bamboo branch of 3 ~ (th) instar bamboo (P _ (0.01)), the content of C _ (+) N _ (N) in the bamboo branch of the 3rd instar bamboo showed a tendency of decreasing with the increase of the nitrogen settlement intensity in the first instar bamboo branch. As a whole, the content of NNP P increased with the increase of nitrogen deposition intensity, and the C content remained relatively stable, and under the same simulated nitrogen deposition intensity treatment, There was no obvious regular change in the content of C _ (N) P in bamboo branches of different ages, but the age of bamboo had a significant effect on the content of N in bamboo branches. There was no significant effect on P content and N: P content of bamboo branch, but the interaction of nitrogen deposition level and age had very significant effect on the content of C ~ (+) N ~ (+) P ~ (+) and C _ (1) N _ (+) N _ (1) P _ (P) in bamboo branch.
【学位授予单位】：浙江农林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S795.7

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