黄土丘陵区典型人工林的根系分布特征

doi:10.13866/j.azr.2021.05.24

Abstract

Abstract:

The root is the main organ through which plants absorb water and nutrients. The development and distribution of roots have an extremely important impact on plant growth. In order to understand the root distribution characteristics of typical artificial forests in Loess Hills areas and provide a scientific basis for vegetation restoration in the future, a case study was carried out on three artificial forests (Populus tomentosa, Pinus tabuliformis and Armeniaca sibirica), located in Longtan watershed, Anding District, Dingxi City, Gansu Province. The study analyzed root length density, root area density and root biomass density in different soil depths and diameter degrees, and the results showed that: (1) Fine roots of different diameter classes were dominant in all three artificial forests. The root length and root area densities of fine roots and total roots were the following: Populus tomentosa>Pinus tabulaeformis>Armeniaca sibirica, while the root biomass density was the following: Pinus tabulaeformis>Populus tomentosa>Armeniaca sibirica. The Pinus tabulaeformis forest had the highest root length and root area densities of middle roots and coarse roots. (2) In the vertical soil profile, the root length, root area, and root biomass densities of total and fine roots decreased with increasing soil depth. However, the vertical distribution feature of middle and coarse roots was not clear. (3) The root length density, root area density and root biomass density of fine and total roots were significantly and positively correlated with soil total carbon, total nitrogen, organic carbon, and water content. The root length and root area densities of middle roots were significantly correlated with soil total carbon, total nitrogen, total phosphorus, and organic carbon. The root length and root area densities of coarse roots were significantly correlated with soil total carbon. The increase in soil carbon, nitrogen and water contents had a synergistic effect on the growth of the root system to a certain extent.

Key words: Loess Hills region, plantation, root, diameter class

LI Hao,HU Chanjuan,ZHAO Rongqin,GUO Lei,MAN Zhou. Root distribution characteristics of three typical plantations in a Loess Hills region[J].Arid Zone Research, 2021, 38(5): 1420-1428.

Figures/Tables 10

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References 33

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林型	坡位	海拔/m	坡度/（°）	坡向/（°）	株距/m	平均胸径/cm	平均树高/m
白杨	上	2010	33.25	W290.5	1.3~1.8	12.03	9.36
油松	上	2048	32.80	NW323.5	1.0~1.3	7.45	7.93
山杏	上	2147	33.96	W250.5	1.2~1.4	6.23	3.49

土层/cm	林型	土壤全碳 /(g·kg^-1)	土壤全氮 /(g·kg^-1)	土壤有机碳 /(g·kg^-1)	土壤全磷 /(g·kg^-1)
0~10	白杨	24.03b	0.70b	5.54b	0.51a
	油松	28.80ab	0.97ab	7.70ab	0.51a
	山杏	30.90a	1.33a	9.48a	0.51a
10~20	白杨	23.27b	0.53c	4.98b	0.51a
	油松	29.47a	0.97a	7.13a	0.52a
	山杏	25.20b	0.70b	5.57b	0.47a
20~30	白杨	22.83b	0.50b	4.64b	0.52a
	油松	28.40a	0.77a	6.02a	0.50a
	山杏	22.97b	0.43b	3.66b	0.48a
30~40	白杨	21.63b	0.40b	3.94ab	0.50a
	油松	25.73a	0.60a	4.38a	0.48a
	山杏	21.97b	0.37b	3.26b	0.54a
40~60	白杨	21.20b	0.33b	2.93ab	0.51a
	油松	23.97a	0.53a	3.68a	0.51a
	山杏	21.73b	0.43ab	2.69b	0.55a
60~80	白杨	20.90b	0.37a	2.67a	0.52a
	油松	23.23a	0.47a	3.24a	0.51a
	山杏	21.17b	0.37a	2.80a	0.55a
80~100	白杨	20.47b	0.30b	3.03a	0.52a
	油松	22.27a	0.47a	3.07a	0.51a
	山杏	20.57b	0.33ab	2.66a	0.54a

根系指标	全氮	全碳	有机碳	含水量	全磷
细根根长密度	0.567^**	0.475^**	0.674^**	0.624^**	-0.163
中根根长密度	0.559^**	0.667^**	0.538^**	0.227	-0.341^**
粗根根长密度	0.214	0.265^*	0.254^*	0.127	0.083
总根长密度	0.573^**	0.484^**	0.679^**	0.624^**	-0.220
细根根面积密度	0.640^**	0.596^**	0.733^**	0.555^**	0.147
中根根面积密度	0.534^**	0.643^**	0.524^**	0.224	-0.321^*
粗根根面积密度	0.215	0.261^*	0.243	0.120	0.101
总根面积密度	0.650^**	0.641^**	0.737^**	0.533^**	-0.209
细根根生物量密度	0.671^**	0.670^**	0.715^**	0.406^**	-0.238
总根生物量密度	0.380^**	0.447^**	0.431^**	0.246	-0.036

Root distribution characteristics of three typical plantations in a Loess Hills region

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