库布齐沙漠东部植被恢复对土壤生态化学计量的影响

doi:10.13866/j.azr.2022.03.26

Abstract

Abstract:

To clarify the impact of vegetation restoration on stoichiometric characteristics, aeolian sandy soil, mobile sandy land, semi-fixed sandy land, Artemisia ordosica-fixed sandy land, and Salix psammophila-fixed sandy land in the eastern part of Kubuqi were selected as research areas. This research analyzed temporal and spatial changes and the correlations among vegetation biomass and soil carbon, nitrogen, and phosphorus stoichiometry at different depths (0-60 cm). Results show the following: (1) the content of soil C and N significantly increased with vegetation restoration, whereas the content of soil P slightly increased and reached a maximum value in Salix cheilophila-fixed sandy land (5.86 g·kg^-1, 0.41 g·kg^-1, 1.74 g·kg^-1), the content of C, N, and P in soil decreased with soil layer depth, and the difference in the P content in the soil layer was small. (2) The soil stoichiometric ratio at different stages or soil layers was significantly different with vegetation restoration. Soil C:N first decreased and then increased, whereas C:P and N:P increased gradually. Soil C:P and N:P decreased gradually with deepening of the soil layer, whereas C:N had no obvious change. (3) Soil C, N, and P were significantly and positively correlated with aboveground and litter biomass and there was no significant correlation between soil C:N and C:P and N:P. However, soil C:P was positively correlated with N:P, and soil C:P and N:P were positively correlated with aboveground, underground, and litter biomass. In conclusion, artificial planting to promote vegetation restoration can significantly affect the content and stoichiometric characteristics of soil C, N, and P to effectively improve soil physical and chemical properties and enhance the carbon and nitrogen sequestration capacity of the desert ecosystem.

Key words: Hobq Desert, vegetation restoration, biomass, soil, stoichiometric characteristics

LIU Yuan,LI Xiaojing,DUAN Yuxi,LI Bo,WANG Weifeng,LIU Zongqi,FENG Tao. Effects of vegetation restoration on soil stoichiometry in the eastern Hobq Desert[J].Arid Zone Research, 2022, 39(3): 924-932.

Figures/Tables 7

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References 39

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样地类型	位置	恢复措施	盖度/%	优势植物	草本		灌木
样地类型	位置	恢复措施	盖度/%	优势植物	株高/cm	密度 /（株·m^-2）	株高/cm	密度 /[株·（100m²）^-1]	冠幅/m²
Md	110°46′46.41″E, 40°04′46.18″N	无	3.3	沙蓬（Agriophyllum squarrosum）、沙竹（Psammochloa villosa）	9.4	10.0	_	_	_
Sf	110°46′42.50″E, 40°04′43.73″N	无	19.7	油蒿（Artemisia ordosica）、猪毛菜（Salsola collina）	9.2	46.0	53.2	18.0	1.2
Ar	110°47′52.56″E, 40°04′24.22″N	飞播	48.5	油蒿、猪毛菜、杨柴（Hedysarum mongolicum）、	10.5	68.0	76.8	87.0	1.5
Sa	110°46′28.34″E, 40°04′ 45.99″N	扦插+飞播	60.3	沙柳（Salix cheilophila）、油蒿、杨柴、狗尾草（Setaria viridis）	6.1	50.0	122.6	206.0	2.6

样地类型	植物种	灌木茎 /（g·m^-2）	灌木叶 /（g·m^-2）	灌木根 /（g·m^-2）	草本地上部分/（g·m^-2）	草本地下部分/（g·m^-2）	凋落物 /（g·m^-2）	地上生物量 /（g·m^-2）	地下生物量 /（g·m^-2）	总生物量 /（g·m^-2）
Md		-	-	-	2.48±1.21b	0.83±0.81c	-	2.48d	0.83d	3.31d
Sf	油蒿	1.24±0.20e	1.07±0.27d	0.92±0.30d	14.42±4.11a	4.62±2.37a	10.16±0.32c	16.73c	5.54c	32.43c
Ar	油蒿	121.97±51.84b	31.22±17.95b	34.04±10.70b	12.36±8.63a	3.10±2.43b	34.89±19.87b	203.84b	37.14b	275.87b
Ar	杨柴	29.34±6.25c	8.95±2.46c	20.47±4.68b	12.36±8.63a	3.10±2.43b	34.89±19.87b	203.84b	37.14b	275.87b
Sa	沙柳	366.23±187.38a	141.81±76.64a	236.13±116.21a	0.81±0.19b	0.32±0.11c	71.26±39.59a	581.68a	236.45a	889.39a
	油蒿	44.66±7.23c	12.68±5.05c	27.72±5.62b
	杨柴	11.44±6.16d	4.05±2.16c	10.13±3.28c

指标	因素	df	均方	F	P	偏η²	R²
C	植被恢复	3	4.186	141.409	<0.001^**	0.930	0.927
	土层深度	3	0.900	30.398	<0.001^**	0.740
	植被恢复×土层深度	9	0.308	10.421	<0.001^**	0.746
N	植被恢复	3	0.015	132.015	<0.001^**	0.925	0.939
	土层深度	3	0.008	66.526	<0.001^**	0.862
	植被恢复×土层深度	9	0.002	16.178	<0.001^**	0.820
P	植被恢复	3	0.022	87.592	<0.001^**	0.891	0.910
	土层深度	3	0.014	55.240	<0.001^**	0.838
	植被恢复×土层深度	9	0.002	6.924	<0.001^**	0.661

指标	因素	df	均方	F	P	偏η²	R²
C：N	植被恢复	3	106.406	17.318	<0.001^**	0.619	0.608
	土层深度	3	16.357	2.662	0.065^*	0.200
	植被恢复×土层深度	9	19.024	3.096	0.009^**	0.465
C：P	植被恢复	3	16.311	87.361	<0.001^**	0.891	0.87
	土层深度	3	2.497	13.377	<0.001^**	0.556
	植被恢复×土层深度	9	0.555	2.971	0.011	0.455
N：P	植被恢复	3	0.052	84.467	<0.001^**	0.888	0.901
	土层深度	3	0.026	42.394	<0.001^**	0.799
	植被恢复×土层深度	9	0.004	6.887	<0.001^**	0.660

	C	N	P	C：N	C：P	N：P	AGB	UGB	LB
C	1	0.986^**	0.995^**	0.856	0.996^**	0.969^*	0.976^*	0.998^**	0.939^*
N		1	0.998^**	0.757	0.987^*	0.996^**	0.976^*	0.983^*	0.956^*
P			1	0.801	0.995^**	0.988^*	0.978^*	0.993^**	0.951^*
C：N				1	0.853	0.704	0.794	0.862^*	0.711
C：P					1	0.971^*	0.981^*	0.995^**	0.946^*
N：P						1	0.974^*	0.967^*	0.965^*
AGB							1	0.981^*	0.990^**
UGB								1	0.946^*

Effects of vegetation restoration on soil stoichiometry in the eastern Hobq Desert

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