Effects of Vegetation Control on Root Traits of Artificial Regeneration of Tilia amurensis Saplings

doi:10.7525/j.issn.1673-5102.2024.02.012

Abstract

Abstract:

Since the regeneration of Tilia amurensis is difficult under full light conditions， and vegetation control can promote the growth of target species by changing light conditions and soil quality. In order to provide the support for the cultivation of T. amurensis， the effects of vegetation control intensity on root traits and soil factors of seedlings were investigated. T. amurensis monocultures（Five-year-old） with inter-row and intra-row spaces of 1.5 m×1.5 m were used as materials， and vegetation control treatments with different intensities T₃₀， T₅₀ and T₇₅（clearing vegetation in the radius of 30， 50， 75 cm around T. amurensis seedlings） and control treatment（CK） were set. The morphological traits， total nutrient content， and non-structural carbon content in the absorptive roots and transport roots of T. amurensis seedlings， as well as soil variables were measured under different treatments， and the effects of vegetation control on root traits and soil conditions were revealed. Vegetation control significantly changed the light intensity in the environment of T. amurensis seedlings， among which the light intensity under T₇₅ treatment was the maximum， and the light intensity decreased with the weakening of vegetation control intensity（P<0.05）. Vegetation control significantly reduced the contents of total carbon， total nitrogen， available nitrogen， and available phosphorus in the soil. With the decrease of vegetation control intensity， the fine root diameter， carbon to phosphorus ratio， soluble sugar and starch contents decreased， while the specific surface area， specific root length， total carbon， total nitrogen and total phosphorus contents increased. Soil variables factors to the variation of root traits for absorptive roots and transport roots were 43.2% and 37.9%， respectively. The greater the vegetation control intensity， the greater the light intensity obtained by T. amurensis saplings， and the root morphology， stoichiometry and physiological traits of T. amurensis saplings took adaptive changes with the change of vegetation control intensity. The root specific surface area， specific root length， total carbon， total nitrogen and total phosphorus contents were increased to enhance the adaptability to low light conditions. The changes of light conditions and soil factors under vegetation control might be the two main factors to explain the root trait changes of T. amurensis saplings.

Key words: Tilia amurensis, seedlings, roots, vegetation control, morphology, physiology

CLC Number:

S792.36

Lixue YANG, Shilin LIU, Hanxuan FU, Siyu ZHOU, Huifeng LIU, Fangyuan SHEN. Effects of Vegetation Control on Root Traits of Artificial Regeneration of Tilia amurensis Saplings[J]. Bulletin of Botanical Research, 2024, 44(2): 267-278.

Figures/Tables 8

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处理 Treatment	树高 Tree height/cm	地径 Ground diameter/mm
T₇₅	10.75±1.13	44.60±2.68
T₅₀	9.19±0.92	41.65±3.31
T₃₀	11.83±1.22	44.75±2.86
CK	12.68±1.03	45.35±2.55
F	1.61	1.95
P	0.19	0.13

因素 Factors	土壤pH Soil pH	土壤含水量 Soil moisture	土壤全碳 Soil total carbon	土壤全氮 Soil total nitrogen	土壤全磷 Soil total phosphorus	土壤速效磷 Soil available phosphorus	土壤有效氮 Soil available nitrogen
根直径 Root diameter	-0.025	-0.051	-0.242	-0.322	-0.084	-0.507*	-0.125
比表面积 Specific surface area	-0.030	-0.128	0.141	0.253	0.199	0.411	-0.012
比根长 Specific root length	-0.139	-0.066	0.128	0.205	-0.046	0.347	0.099
组织密度 Root tissue density	-0.135	0.069	-0.171	-0.249	-0.352	-0.377	0.105
根全碳 Root total carbon	0.543*	0.320	0.586**	0.472*	0.417	0.370	0.200
根全氮 Root total nitrogen	0.272	0.001	0.417	0.590**	0.356	0.534*	0.253
根全磷 Root total phosphorus	0.257	0.102	0.391	0.408	0.381	0.386	0.162
可溶性糖 Soluble sugar	-0.324	0.012	-0.402	-0.532*	-0.104	-0.071	-0.256
淀粉 Starch	-0.697**	-0.436	-0.734**	-0.723**	0.534*	-0.223	-0.335

因素 Factors	土壤pH Soil pH	土壤含水量 Soil moisture	土壤全碳 Soil total carbon	土壤全氮 Soil total nitrogen	土壤全磷 Soil total phosphorus	土壤速效磷 Soil available phosphorus	土壤有效氮 Soil available nitrogen
根直径 Root diameter	-0.604**	-0.299	-0.618**	-0.669**	-0.494*	-0.347	-0.146
比表面积 Specific surface area	0.570**	0.432	0.499*	0.487*	0.385	0.439	-0.102
比根长 Specific root length	0.522*	0.406	0.517*	0.539*	0.405	0.453*	-0.015
组织密度 Root tissue density	0.130	-0.258	-0.029	0.111	-0.044	-0.210	0.237
根全碳 Root total carbon	0.295	0.168	0.465*	0.549*	0.459*	0.405	0.459*
根全氮 Root total nitrogen	0.385	0.102	0.517*	0.604**	0.532*	0.459*	0.272
根全磷 Root total phosphorus	0.360	0.543*	0.544*	0.353	0.161	0.062	0.250
可溶性糖 Soluble sugar	-0.211	-0.155	-0.453*	-0.558*	-0.258	-0.531*	-0.337
淀粉 Starch	-0.150	-0.060	-0.174	-0.089	-0.372	-0.215	0.036

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