沙棘林密度和丛枝菌根真菌接种对林下植物和土壤性状的影响

doi:10.11707/j.1001-7488.LYKX20220146

Abstract

Abstract:

Objective: To select an optimal way of the semi-arid coal mining restoration in China, we illustrated the effect of Hippophae rhamnoides planting density, arbuscular mycorrhizal fungi (AMF) inoculation and their interaction on the understory vegetation and soil properties. Method: A two-factor experimental design with three planting densities (L: 836 tree ? hm^?2; M: 1 111 tree ? hm^?2; H:1 667 tree ? hm^?2), two inoculation treatments (AMF, CK) and the natural recovery area selected as the control was conducted in Daliuta mine in Shenmu county, Shanxi province, northwest China. The shrubs were planted in April 2012 and the AMF inoculation was conducted in July 2012 in small hole near shurbs. In October 2020, a vegetation survey and mixed sampling in 0-20 cm topsoil were carried out. All plots were totally 8 400 m². The indices of understory vegetation and soil properties were selected for principal component analysis, and five principal components with characteristic values greater than 1 were selected to obtain the weight by the factor load matrix and calculate the comprehensive score. Result: 1) Improving planting density and AMF inoculation both improved the canopy coverage and existing density of Hippophae rhamnoides. 2) The planting density significantly increased the Pielou evenness of understory vegetation and decreased the Simpson dominance of understory vegetation, and the inoculation of AMF significantly increased the Pielou evenness index and decreased the Simpson dominance index of understory vegetation. Planting density significantly influenced the community composition, biomass and coverage of understory vegetation, and the biomass of understory vegetation was the largest at medium planting density. AMF inoculation significantly changed the community composition and biomass of understory vegetation. 3) The planting density and AMF inoculation significantly influenced the biomass of AMF and soil properties. The AMF biomass, microbial biomass and soil physical and chemical properties were at a high level under medium planting density. 4) There was significant interaction in planting density and mycorrhizal inoculation. The influence of planting density on understory vegetation and soil properties was less in inoculation treatments, compared to the control. 5) The comprehensive score results showed that the ecological restoration effect of medium planting density was the best in our study. Conclusion: In this experiment, the ecological restoration effect of medium planting density was the best in our study. Inoculation with AMF provided more ecological niches for planting, and relieved the limitation of high planting density on the growth and positive successions of understory vegetation.

Key words: planting density of Hippophae rhamnoides, arbuscular mycorrhizal fungi, understory plant community, topsoil properties, ecological restoration

CLC Number:

S719

Xiao Wang,Yinli Bi,Yi Wang,Ye Tian,Qiang Li,Xinpeng Du,Yun Guo. Effects of Planting Density of Hippophae rhamnoides and Inoculation of AMF on Understory Vegetation Growth and Soil Improvement[J]. Scientia Silvae Sinicae, 2023, 59(10): 138-149.

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差异来源 Difference source	df	Shannon-Wiener指数 Shannon-Wiener index		Pielou均匀度指数 Pielou evenness index		Simpson优势度 Simpson dominance index		Margalef丰富度指数 Margalef richness index
差异来源 Difference source	df	F	P	F	P	F	P	F	P
接菌处理 Inoculum treatment (A)	1	0.626	0.444	8.597	0.013	6.333	0.027	0.196	0.666
密度处理 Density treatment (B)	2	1.232	0.326	15.507	0.000	5.265	0.023	0.909	0.429
A、B互作 Interaction of A、B	2	1.067	0.375	5.776	0.017	2.006	0.177	1.082	1.082

指标 Indexes	对照区Control area			接菌区Inoculated area			自然恢复区 Natural recovery area
指标 Indexes	低密度 Low density	中等密度 Intermediate density	高密度 High density	低密度 Low density	中等密度 Intermediate density	高密度 High density	自然恢复区 Natural recovery area
pH	7.61±0.07Bb	7.81±0.02Ba	7.86±0.09Ba	7.97±0.18Ab	8.04±0.14Aab	8.20±0.06Aa	7.03±0.06*
电导率 Conductivity/(μs ? cm^?1)	43.20±19.24Ab	57.4±3.37Aa	40.0±1.21Ab	53.51±3.06Aa	58.33±0.92Aa	47.86±1.06Ab	24.91±4.80*
土壤含水率 Soil water content (%)	3.21±0.29A	3.29±1.12A	2.99±0.31A	3.82±0.82A	3.59±0.14A	2.07±0.29A	4.16±1.74
黏粒含量 Clay content (%)	0.02±0.02Ab	0.17±0.02Aa	0.17±0.11Aa	0.10±0.01Ab	0.22±0.08Aa	0.17±0.05Aa	0.00±0.00
粉粒含量 Silt content (%)	2.92±0.97Ab	5.41±1.08Aa	6.24±1.76Aa	4.68±0.25Ab	6.29±0.95Aa	5.30±0.49Aa	0.00±0.00*
砂粒含量 Sand content (%)	97.06±0.99Aa	94.46±1.10Ab	93.59±1.87Ab	95.22±0.24A^a	93.4±1.03Ab	94.54±0.51Aab	100.00±0.00*
有机质 Soil organic carbon/(g ? kg^?1)	6.67±0.69Aa	7.89±1.54Aa	8.82±0.31Aa	8.67±0.33Aa	8.26±0.92Aa	8.42±0.34Aa	2.75±0.51*
全氮 Total nitrogen/ (g ? kg^?1)	0.76±0.03Aa	0.86±0.21Aa	0.48±0.05Bb	0.54±0.04Bb	0.72±0.02Aa	0.39±0.06Bc	0.12±0.05*
全磷 Total phosphorus/(g ? kg^?1)	0.28±0.02Bc	0.30±0.02Ab	0.40±0.02Ba	0.39±0.01Ab	0.36±0.01Ab	0.46±0.10Aa	0.33±0.01
无机氮Available nitrogen/ (mg ? kg^?1)	5.20±0.44Ab	7.00±1.77Aab	8.00±1.10Aa	5.11±1.49Aa	8.40±2.17Aa	6.25±0.50Aa	4.29±1.52
有效磷Available phosphorus/ (mg?kg^?1)	4.16±0.16Ba	3.65±0.37Ba	3.97±0.06Ba	5.92±0.53Aa	5.51±0.37Aa	3.05±0.88Ab	8.54±1.73*

处理 Treatment		根系菌根侵染率 Mycorrhizal colonization frequency (%)	根系菌根侵染密度 Mycorrhizal colonization intensity (%)	根系丛枝丰富度 Arbuscule Abundance (%)
对照区Control area	低Low	86±5.13Bb	17.67±1.10Bb	0.01±0.01Bb
	中Intermediate	98±2.89Aa	27.04±1.63Ba	0.00±0.00Bb
	高High	100±0.00Aa	27.18±0.48Ba	0.12±0.03Ba
接菌区Inoculated area	低Low	100±0.00Aa	22.56±0.89Ac	0.32±0.04Ac
	中Intermediate	100±0.00Aa	33.92±1.88Ab	0.63±0.03Ab
	高High	100±0.00Aa	43.97±1.51Aa	4.34±1.14Aa

处理 Treatment		第1 主成分 PC1	第2 主成分 PC2	第3 主成分 PC3	第4 主成分 PC4	第5 主成分 PC5	综合得分 Comprehensive score	排名 Rank
对照区 Control area	低 Low	?1.747	2.204	?0.539	?0.388	?0.969	?0.766	6
	中等 Intermediate	2.490	1.731	0.152	?0.713	?0.094	1.708	2
	高 High	0.280	?2.064	?0.967	?0.569	0.906	?0.292	5
接菌区 Inoculated area	低 Low	0.966	?1.687	1.634	0.871	?0.847	0.440	4
	中等 Intermediate	3.230	1.114	0.789	0.732	1.206	2.284	1
	高 High	2.095	?1.112	?1.461	0.183	?0.672	0.838	3
自然恢复区 Natural recovery area		?7.454	?0.173	0.392	?0.116	0.471	?4.292	7

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Effects of Planting Density of Hippophae rhamnoides and Inoculation of AMF on Understory Vegetation Growth and Soil Improvement

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