氮添加与干季延长对降香黄檀幼苗非结构性碳水化合物、养分与生物量的影响

doi:10.17521/cjpe.2022.0473

植物生态学报 ›› 2023, Vol. 47 ›› Issue (8): 1094-1104.DOI: 10.17521/cjpe.2022.0473 cstr: 32100.14.cjpe.2022.0473

所属专题：全球变化与生态系统；生态化学计量

氮添加与干季延长对降香黄檀幼苗非结构性碳水化合物、养分与生物量的影响

苏炜¹^,², 陈平², 吴婷¹, 刘岳¹, 宋雨婷¹, 刘旭军¹, 刘菊秀¹^,^*()

¹中国科学院华南植物园, 广州 510650
²仲恺农业工程学院, 广州 510260

收稿日期:2022-11-22 接受日期:2023-02-22 出版日期:2023-08-20 发布日期:2023-02-24
基金资助:
国家自然科学基金(41991285);国家自然科学基金(32201367);国家自然科学基金(32101342);国家自然科学基金(41977287);广东省重点领域研发计划(2020B1111530004);广东省财政专项林业项目

Effects of nitrogen addition and extended dry season on non-structural carbohydrates, nutrients and biomass of Dalbergia odorifera seedlings

SU Wei¹^,², CHEN Ping², WU Ting¹, LIU Yue¹, SONG Yu-Ting¹, LIU Xu-Jun¹, LIU Ju-Xiu¹^,^*()

¹South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
²Zhongkai University of Agriculture and Engineering, Guangzhou 510260, China

Received:2022-11-22 Accepted:2023-02-22 Online:2023-08-20 Published:2023-02-24
Supported by:
National Natural Science Foundation of China(41991285);National Natural Science Foundation of China(32201367);National Natural Science Foundation of China(32101342);National Natural Science Foundation of China(41977287);Key Research and Development Program of Guangdong Province(2020B1111530004);Guangdong Provincial Finance Special for Forestry Project

摘要/Abstract

摘要：

氮(N)添加和干季延长会对植物的非结构性碳水化合物(NSCs)含量、碳(C)、N、磷(P)浓度和生物量等产生深远影响, 然而这种影响在同一植物不同器官(叶、枝、树干、根)间的差别尚不清晰。该研究以华南地区名贵树种降香黄檀(Dalbergia odorifera)幼苗为对象, 探究降香黄檀幼苗不同器官的NSCs含量、养分含量、化学计量比以及生物量对N添加和干季延长的响应, 比较不同环境下降香黄檀的生长状况与养分分配情况, 为预测全球变化下降香黄檀的生长提供理论依据。结果显示: (1) N添加显著增加树干的NSCs含量, 而N、水交互(N添加和干季延长交互处理)作用下树干的NSCs含量显著降低, N添加、干季延长及其交互作用显著增加根的可溶性糖含量; (2) N添加下根的N含量显著增加、C:N显著降低, N、水交互作用下降香黄檀树干C:P和N:P降低; (3) N添加、干季延长及其交互作用下降香黄檀总生物量无显著变化, 但叶质比显著降低, 并且N添加与干季延长下根冠比降低, 茎叶比则显著增加。因此, 未来干季延长背景下, N添加可能会促进降香黄檀幼苗树干的生长, 有利于提高降香黄檀的经济价值, 但需要在干季适量补水, 防止降香黄檀受干旱胁迫导致生长受到抑制。

关键词: 氮添加, 干季延长, 非结构性碳水化合物, 养分, 生物量, 降香黄檀

Abstract:

Aims Nitrogen addition and extended dry season can profoundly affect non-structural carbohydrates (NSCs), carbon (C), nitrogen (N) and phosphorus (P) concentrations, and biomass of plants, however, the different responses of various organs (leaf, trunk, stem and root) in the same plants are not clear. We thus explored such responses to N addition and extended dry season to help better predict plant growth under global changes.

Methods The investigation was conducted with Dalbergia odorifera seedlings through a manipulated N and water experiment. The concentrations of NSCs and C, N, and P and allocation pattern of biomass in different organs of D. odorifera seedling were determined, and then compared among different treatments.

Important findings (1) N addition significantly increased trunk NSCs concentrations, while the interaction of N addition and extended dry season significantly decreased NSCs concentrations. N addition, extended dry season and their interaction significantly increased root soluble sugar concentrations. (2) N addition significantly increased root N concentrations and decreased C:N, and the interaction of N addition and extended dry season significantly decreased C:P and N:P in trunks. (3) All treatments did not influence the total biomass of D. odorifera, but significantly decreased the ratio of leaf biomass to total biomass, and N addition and extended dry season significantly decreased the ratio of root biomass to shoot biomass but increased the ratio of stem biomass to leaf biomass. Overall, N addition may promote the growth of seedling trunks and improve the economic value of D. odoriferaunder the extended dry season in the future. In order to prevent the growth of D. odorifera from being inhibited under drought stress, it is necessary to replenish an appropriate amount of water in the dry season.

Key words: nitrogen addition, extended dry season, non-structural carbohydrate, nutrient, biomass, Dalbergia odorifera

苏炜, 陈平, 吴婷, 刘岳, 宋雨婷, 刘旭军, 刘菊秀. 氮添加与干季延长对降香黄檀幼苗非结构性碳水化合物、养分与生物量的影响. 植物生态学报, 2023, 47(8): 1094-1104. DOI: 10.17521/cjpe.2022.0473

SU Wei, CHEN Ping, WU Ting, LIU Yue, SONG Yu-Ting, LIU Xu-Jun, LIU Ju-Xiu. Effects of nitrogen addition and extended dry season on non-structural carbohydrates, nutrients and biomass of Dalbergia odorifera seedlings. Chinese Journal of Plant Ecology, 2023, 47(8): 1094-1104. DOI: 10.17521/cjpe.2022.0473

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2022.0473

https://www.plant-ecology.com/CN/Y2023/V47/I8/1094

图/表 6

图1 华南植物园氮水交互实验样地基本情况。A, 4种样地处理。B, 原位实验图。

Fig. 1 Basic information of the sample plots for nitrogen-water interaction experiment in South China Botanical Garden. A, Four treatments. CK, control; ED, extended dry season; MN, nitrogen addition; MNED, nitrogen addition × extended dry season. B, In situ experimental photograph.

表1 降香黄檀各器官的异速生长方程及相关统计参数

Table 1 Allometric growth equations and related statistical parameters for different organs of Dalbergia odorifera

器官 Organ	方程 Equation	F	R²	p
叶 Leaf	B = 0.586 × (D²H)^0.904	7.166	0.230	0.013
树干 Trunk	B = 0.858 × (D²H)^0.617	65.402	0.723	<0.001
枝 Stem	B = 0.557 × (D²H)^2.814	6.767	0.244	0.017
根 Root	B = 0.654 × (D²H)^1.317	27.893	0.538	<0.001
总计 Total	B = 0.662 × (D²H)^5.534	46.929	0.662	<0.001

图2 不同处理下降香黄檀各器官非结构性碳水化合物含量和比值变化(平均值±标准误, n = 3)。CK, 对照; ED, 干季延长; MN, 氮添加; MNED, 氮添加×干季延长。同一器官中不同小写字母表示差异显著(p < 0.05)。

Fig. 2 Variations in non-structural carbohydrate concentrations and ratios in different organs of Dalbergia odorifera under different treatments (mean ± SE, n = 3). CK, control; ED, extended dry season; MN, nitrogen addition; MNED, nitrogen addition × extended dry season. Different lowercase letters indicate significant differences between treatments (p < 0.05).

图3 不同处理下降香黄檀的各器官养分含量及比值变化(平均值±标准误, n = 3)。CK, 对照; ED, 干季延长; MN, 氮添加; MNED, 氮添加×干季延长。同一器官中不同小写字母表示差异显著(p < 0.05)。

Fig. 3 Variation in nutrient concentrations and ratios in different organs of Dalbergia odorifera under different treatments (mean ± SE, n = 3). CK, control; ED, extended dry season; MN, nitrogen addition; MNED, nitrogen addition × extended dry season. Different lowercase letters indicate significant differences between treatments (p < 0.05).

表2 不同处理下降香黄檀各器官生物量分配(平均值±标准误, n = 3)

Table 2 Variation in the biomass allocation among different organs of Dalbergia odorifera under different treatments (mean ± SE, n = 3)

	处理 Treatment	叶 Leaf	树干 Trunk	枝 Stem	根 Root	总计 Total
鲜质量 Fresh mass (kg)	CK	1.21 ± 0.08^a (12.80%^a)	5.83 ± 0.41^a (39.72%^b)	2.04 ± 0.25^a (23.42%^a)	2.04 ± 0.19^a (24.06%^a)	8.22 ± 0.36^a
	ED	0.52 ± 0.14^c (15.05%^a)	4.41 ± 1.01^a (58.46%^a)	1.07 ± 0.15^c (13.33%^a)	1.24 ± 0.25^b (13.16%^b)	4.37 ± 1.03^b
	MN	0.53 ± 0.08^c (12.66%^a)	5.46 ± 1.44^a (49.25%^ab)	1.27 ± 0.12^bc (26.89%^a)	1.34 ± 0.15^b (11.20%^b)	5.83 ± 1.02^ab
	MNED	0.90 ± 0.46^b (15.21%^a)	5.77 ± 0.48^a (44.61%^ab)	1.41 ± 0.04^b (22.74%^a)	2.22 ± 0.21^a (17.44%^ab)	8.36 ± 1.09^a
干质量 Dry mass (kg)	CK	0.45 ± 0.06^a (7.89%^a)	3.25 ± 0.31^a (56.37%^a)	1.01 ± 0.20^a (17.48%^a)	1.06 ± 0.10^ab (18.27%^ab)	5.77 ± 0.18^a
	ED	0.19 ± 0.05^c (4.83%^b)	2.54 ± 1.02^a (63.24%^a)	0.55 ± 0.13^b (15.74%^a)	0.63 ± 0.12^c (16.19%^b)	3.92 ± 0.66^a
	MN	0.20 ± 0.04^c (4.73%^b)	2.94 ± 1.29^a (63.92%^a)	0.61 ± 0.06^b (14.45%^a)	0.83 ± 0.12^bc (16.91%^ab)	4.48 ± 0.87^a
	MNED	0.31 ± 0.04^b (5.48%^b)	3.14 ± 0.21^a (61.66%^a)	0.64 ± 0.04^b (11.23%^a)	1.52 ± 0.145^a (21.64%^a)	5.83 ± 0.59^a

图4 不同处理下降香黄檀根冠比和茎叶比(平均值±标准误, n = 3)。CK, 对照; ED, 干季延长; MN, 氮添加; MNED, 氮添加×干季延长。不同小写字母表示不同处理间差异显著(p < 0.05)。

Fig. 4 Root shoot ratio (R:S) and stem leaf ratio (S:L) in Dalbergia odorifera (mean ± SE, n = 3). CK, control; ED, extended dry season; MN, nitrogen addition; MNED, nitrogen addition × extended dry season. Different lowercase letters indicate significant differences between treatments (p < 0.05).

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氮添加与干季延长对降香黄檀幼苗非结构性碳水化合物、养分与生物量的影响

Effects of nitrogen addition and extended dry season on non-structural carbohydrates, nutrients and biomass of Dalbergia odorifera seedlings

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