西南喀斯特石漠化环境适生植物构树细根、根际土壤化学计量特征

doi:10.17521/cjpe.2020.0083

植物生态学报 ›› 2020, Vol. 44 ›› Issue (9): 962-972.DOI: 10.17521/cjpe.2020.0083

所属专题：生态化学计量

西南喀斯特石漠化环境适生植物构树细根、根际土壤化学计量特征

胡琪娟¹^,³, 盛茂银¹^,²^,^*(), 殷婕¹^,³, 白义鑫¹^,³

¹贵州师范大学喀斯特研究院, 贵阳 550001
²国家喀斯特石漠化治理工程技术研究中心, 贵阳 550001
³贵州省喀斯特石漠化防治与衍生产业工程实验室, 贵阳 550001

收稿日期:2020-03-26 接受日期:2020-06-18 出版日期:2020-09-20 发布日期:2020-08-27
通讯作者: * 盛茂银(shmoy@163.com). ORCID: 盛茂银: 0000-0002-4973-2590
基金资助:
国家自然科学基金(31660136);贵州省科学技术基金黔科合基础([2019]1224);贵州省科技计划项目黔科合平台人才([2017]5726);贵州省优秀青年科技人才支持计划黔科合平台人才([2017]5638)

Stoichiometric characteristics of fine roots and rhizosphere soil of Broussonetia papyrifera adapted to the karst rocky desertification environment in southwest China

HU Qi-Juan¹^,³, SHENG Mao-Yin¹^,²^,^*(), YIN Jie¹^,³, BAI Yi-Xin¹^,³

¹Institute of Karst Research, Guizhou Normal University, Guiyang 550001, China
²National Engineering Research Center for Karst Rocky Desertification Control, Guiyang 550001, China
³Guizhou Engineering Laboratory for Karst Rocky Desertification Control and Derivative Industry, Guiyang 550001, China

Received:2020-03-26 Accepted:2020-06-18 Online:2020-09-20 Published:2020-08-27
Contact: SHENG Mao-Yin
Supported by:
Supported by the National Natural Science Foundation of China(31660136);the Science and Technology Foundation of Guizhou Province([2019]1224);the Key Project of Guizhou Science and Technology Fund([2017]5726);the Support Plan for Excellent Young Science and Technology Talents of Guizhou Province([2017]5638)

摘要/Abstract

摘要：

为了解西南喀斯特石漠化适生植物构树(Broussonetia papyrifera)对贫瘠土壤养分环境的适应策略, 及其细根、根际土壤的化学计量特征对石漠化等级的响应, 该研究以西南喀斯特石漠化环境适生植物构树为研究对象, 运用生态化学计量学方法, 开展不同等级石漠化环境构树细根、根际土壤有机碳(C)、全氮(N)、全磷(P)、全钾(K)、全钙(Ca)及全镁(Mg)养分含量特征及C、N、P化学计量特征研究。结果表明, 除Ca含量外, 喀斯特石漠化环境适生植物构树细根、根际土壤的养分含量均处于较低水平; 细根N:P为12.59, 表明构树生长受N和P共同限制; 随着石漠化等级的增加, 细根C、N含量和C:N、C:P呈先降后升的变化趋势, K、P含量是则表现为先升后降, Ca、Mg含量和N:P无明显变化规律; 不同等级石漠化环境中的构树根际土壤N、P、K、Ca含量呈不同的变化趋势, 而C、Mg含量及C、N、P化学计量特征的变化较不显著; 细根与根际土壤的化学计量特征之间存在显著的相关性, 二者的C、P、Ca、Mg含量、C:N、C:P分别对应呈显著正相关关系, 而N含量呈极显著负相关关系; 细根的K含量则较为稳定, 几乎不受根际土壤养分的影响。

关键词: 石漠化, 生态化学计量, 构树, 细根, 根际土壤养分

Abstract:

Aims The objectives of this study were to estimate the adaptation strategies of Broussonetia papyrifera to the poor soil nutrients in karst rocky desertification area in Southwest China, and to explore the response of stoichiometric characteristics of fine roots and rhizosphere soil to the degree of rocky desertification.
Methods The contents of carbon (C), nitrogen (N), phosphorus (P), calcium (Ca), magnesium (Mg) and C:N:P ratios of fine roots and rhizosphere soil of B. papyrifera were studied.
Important findings Results indicated that, except Ca content, the nutrient content of the fine roots and rhizosphere soil of B. papyrifera in karst rocky desertification environment remained at the low level. N:P ratio of fine roots was 12.59, which indicated that the growth of B. papyrifera was co-limited by N and P. With the increase of the degree of rocky desertification, the content of C and N as well as C:N and C:P ratios of fine roots decreased first and then increased; while the content of K and P increased first and then decreased; and neither the content of Ca, Mg nor N:P ratio changed significantly. The content of N, P, K, Ca in rhizosphere soil was different when the degree of rocky desertification was different, while none of C, Mg and C:N:P ratios in rhizosphere soil changed significantly. Additionally, the content of C, P, Ca, Mg as well as C:N and C:P ratios in the fine roots were positively correlated with their values in rhizosphere soil, while N content in fine roots was negatively correlated with its value in the rhizosphere soil. Moreover, the content of K in fine roots was relatively stable, and was hardly affected by the nutrients of rhizosphere soil.

Key words: desertification, ecological stoichiometry, Broussonetia papyrifera, fine roots, rhizosphere soil nutrients

胡琪娟, 盛茂银, 殷婕, 白义鑫. 西南喀斯特石漠化环境适生植物构树细根、根际土壤化学计量特征. 植物生态学报, 2020, 44(9): 962-972. DOI: 10.17521/cjpe.2020.0083

HU Qi-Juan, SHENG Mao-Yin, YIN Jie, BAI Yi-Xin. Stoichiometric characteristics of fine roots and rhizosphere soil of Broussonetia papyrifera adapted to the karst rocky desertification environment in southwest China. Chinese Journal of Plant Ecology, 2020, 44(9): 962-972. DOI: 10.17521/cjpe.2020.0083

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链接本文: https://www.plant-ecology.com/CN/10.17521/cjpe.2020.0083

https://www.plant-ecology.com/CN/Y2020/V44/I9/962

图/表 6

表1 西南喀斯特石漠化环境构树样地设置及样地基本信息

Table 1 Descriptions of the sampling sites and the quadrat setting of Broussonetia papyrifera in karst rocky desertification environment of Southwest China

石漠化等级 Degree of rocky desertification	样地号 Plot number	样本数 Sample size	林龄 Stand age (a)	平均胸径 Mean diameter at breast height (cm)	郁闭度 Canopy density
无 Nil	I-1-I-2	18	5	13.75 ± 0.18	0.43 ± 0.02
潜在 Potential	II-1-II-2	18	5	13.42 ± 0.20	0.51 ± 0.04
轻度 Slight	III-1-III-4	36	6	14.15 ± 0.15	0.41 ± 0.01
中度 Moderate	IV-1-IV-5	45	6	14.09 ± 0.28	0.35 ± 0.01
强度 Severe	V-1-V-4	36	5	14.36 ± 0.11	0.32 ± 0.01

表2 喀斯特石漠化强度分级标准

Table 2 Classification standard of karst rocky desertification

石漠化等级 Degree of rocky desertification	岩石裸露率 Percentage of bare rock (%)	土层覆盖度 Soil coverage (%)	植被和土层覆盖度之和 Coverage of vegetation and soil (%)	坡度 Slope (°)	平均土层厚度 Average of soil thickness (cm)
无 Nil	<20	>60	>80	<15	>20
潜在 Potential	20-30	≤60	70-80	≥15	≤20
轻度 Slight	31-50	≤30	50-69	≥18	≤15
中度 Moderate	51-70	≤20	30-49	≥22	≤10
强度 Severe	71-90	≤10	10-29	≥25	≤5

表3 西南喀斯特石漠化环境构树细根和根际土壤的养分含量及化学计量特征(n = 153)

Table 3 Nutrient contents and stoichiometric characteristics of fine roots and rhizosphere soil of Broussonetia papyrifera in karst rocky desertification environment of Southwest China (n = 153)

项目 Item	细根 Fine root			根际土壤 Rhizosphere soil
项目 Item	平均值 Mean (mg·g^-1)	标准偏差 Standard deviation (mg·g^-1)	变异系数 Coefficient of variation (%)	平均值 Mean (mg·g^-1)	标准偏差 Standard deviation (mg·g^-1)	变异系数 Coefficient of variation (%)
C	445.61	48.98	10.99	25.79	6.04	23.42
N	5.98	1.08	18.06	2.15	0.26	12.09
P	0.48	0.07	14.58	1.11	0.21	18.92
K	2.71	0.84	31.00	1.88	0.52	27.66
Ca	8.60	3.58	41.63	12.03	2.69	22.36
Mg	0.77	0.27	35.32	1.56	0.55	35.26
C:N	77.98	20.92	26.83	12.07	2.80	23.20
C:P	962.06	222.19	23.10	23.93	6.46	27.00
N:P	12.59	1.90	15.09	1.99	0.37	18.59

图1 不同等级石漠化环境构树细根C、N、P、K、Ca、Mg含量及C、N、P比值(平均值+标准偏差)。横坐标的1、2、3、4、5分别代表无、潜在、轻度、中度、强度等级石漠化。不同小写字母表示不同等级石漠化环境下细根的养分含量及化学计量比差异显著(p < 0.05)。

Fig. 1 Changes in C, N, P, K, Ca, Mg contents and C, N, P ratios of Broussonetia papyrifera fine roots with the degree of rocky desertification (mean + SD). 1, 2, 3, 4 and 5 in the abscissa axis represent nil, potential, slight, moderate and severe rocky desertification respectively. Different lowercase letters denote significant difference in nutrient contents and stoichiometric characteristics of fine roots among different degree of rocky desertification environment at p = 0.05 level.

图2 不同等级石漠化环境构树根际土壤C、N、P、K、Ca、Mg含量及C、N、P比值(平均值+标准偏差)。横坐标的1、2、3、4、5分别代表无、潜在、轻度、中度、强度等级石漠化。不同小写字母表示不同等级石漠化环境下根际土壤的养分含量及化学计量比差异显著(p < 0.05)。

Fig. 2 Changes in C, N, P, K, Ca, Mg contents and C, N, P ratios of Broussonetia papyrifera rhizosphere soil with the degree of rocky desertification (mean + SD). 1, 2, 3, 4 and 5 in the abscissa axis represent nil, potential, slight, moderate and severe rocky desertification respectively. Different lowercase letters denote significant difference in nutrient contents and stoichiometric characteristics of rhizosphere soil among different degree of rocky desertification environment at p = 0.05 level.

表4 细根(FR)与根际土壤(RS)的养分含量及C、N、P计量特征的相关系数

Table 4 Correlation coefficient between C, N, P and their ratios in fine roots (FR) and their values in rhizosphere soil (RS)

项目 Item	RS C	RS N	RS P	RS K	RS Ca	RS Mg	RS C:N	RS C:P	RS N:P
FR C	0.542^**	0.295^**	0.039	-0.153	-0.313^**	-0.510	0.480^**	0.467^**	0.148
FR N	-0.261^**	-0.380^**	-0.215^*	-0.004	-0.045	-0.144	-0.146	-0.092	0.033
FR P	-0.231^**	-0.176^*	0.198^*	0.181^*	0.142	0.018	-0.191^*	-0.438^**	-0.399^**
FR K	-0.143	-0.190	0.079	0.117	0.064	-0.037	-0.055	-0.174^*	-0.193^*
FR Ca	0.080	0.133	0.208^*	0.150	0.207^*	0.356^**	0.037	-0.154	-0.190^*
FR Mg	-0.034	0.021	0.084	-0.254^**	0.105	0.188^*	-0.117	-0.160^*	-0.078
FR C:N	0.467^**	0.373^**	0.122	-0.132	-0.142	0.001	0.368^**	0.342^**	0.081
FR C:P	0.413^**	0.226^**	-0.154	-0.251^*	-0.191^*	-0.045	0.381^**	0.548^**	0.361^**
FR N:P	-0.051	-0.231^**	-0.448^**	-0.155	-0.136	-0.145	0.048	0.346^**	0.459^**

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西南喀斯特石漠化环境适生植物构树细根、根际土壤化学计量特征

Stoichiometric characteristics of fine roots and rhizosphere soil of Broussonetia papyrifera adapted to the karst rocky desertification environment in southwest China

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