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

doi:10.17521/cjpe.2020.0083

Abstract

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

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[J]. Chin J Plant Ecol, 2020, 44(9): 962-972.

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

Figures/Tables 6

References 47

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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

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

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

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

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