阿拉善高原土地砾化特征及监测指标

doi:10.13866/j.azr.2023.06.08

Abstract

Abstract:

Foundation data from which to develop indicators to monitor and evaluate the graveling land of the Alxa Plateau is required. To address this, the characteristics of surface gravel coverage (G_c), surface gravel mass per unit area (G_m), gravel mass content in the 0-5 and 5-10 cm soil depths [G_mc (0-5 cm), G_mc (5-10 cm)], and their relationships in the land graveling areas of the Alxa Plateau were assessed and analyzed using one-way analysis of variance, Duncan multiple comparisons, univariate linear regression, and correlation analysis. The average total G_c was 39.49% and the average total G_m was 3544.04 g·m^-2. The G_c and G_m values at 4-8 and 8-16 mm were significantly higher when compared with the other particle sizes (P < 0.05). The coefficients of variation for G_c and G_m with a particle size of 4-8 mm were the smallest and most stable. The spatial distribution patterns of the G_c and G_m showed gradual increases from east to west and south to north. Different particle sizes (total) of the G_m and G_c showed extremely significant linear regression (P < 0.01 ), G_m could also be a good evaluation of the land graveling level. According to the classification threshold at the graveling level for G_c, the corresponding classification for G_m was determined. Except for the 2-4 mm and > 32 mm particles, the correlations between particle sizes in the G_c, G_m, and G_mc in the 0-5 cm soil layer were significantly greater when compared with the 5-10 cm soil layer, and the correlations between total G_c, G_m, and G_mc in the 0-5 cm soil layer were significantly greater when compared with the 5-10 cm soil layer. A surface gravel coverage threshold of 25% was determined for the Gobi, which is a graveling land type. The results of this study provide indicator data on which to base the monitoring and assessment of graveling land in the Alxa Plateau and other regions.

Key words: land graveling, gravel coverage, surface gravel mass per unit area, gravel mass content, Alxa Plateau

WEN Wenjie, PEI Hao, BA Gen, WU Yongjun, LIU Zhiming. Land graveling characteristics and monitoring indicators of the Alxa Plateau[J].Arid Zone Research, 2023, 40(6): 926-936.

Figures/Tables 16

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项目	总的G_c/%	总的G_m/(g·m^-2)	总的G_mc（0~5 cm）/%	总的G_mc（5~10 cm）/%
AM±SD	39.49±14.84	3544.04±1737.18	16.69±8.08	14.04±10.58
Max	83.57	10488.56	53.78	67.81
Min	2.34	146.56	2.48	0.82

砾石粒径/mm	C_v
砾石粒径/mm	G_c	G_m	G_mc（0~5 cm）	G_mc（5~10 cm）
2~4	58.80	59.95	64.36	73.40
4~8	48.44	54.29	75.00	110.38
8~16	59.76	66.53	60.99	79.11
16~32	75.79	80.04	74.27	78.16
>32	101.15	118.61	66.80	90.23

土地砾化程度	G_c（总）/%	G_m（总）/（g·m^-2）
轻度砾化	2< G_c（总）≤10	196 < G_m（总）≤980
中度砾化	10 < G_c（总）≤25	980 < G_m（总）≤2451
重度砾化Ⅰ级	25 < G_c（总）≤40	2451 < G_m（总）≤3922
重度砾化Ⅱ级	40 < G_c（总）≤70	3922 < G_m（总）≤6863
重度砾化III级	G_c（总）>70	G_m（总）>6863

	砾石粒径/mm	G_c
	砾石粒径/mm	2~4	4~8	8~16	16~32	>32	总
G_mc （0~5 cm）	2~4	0.337^**	-0.008	-0.441	-0.385^**	-0.219^**	-0.246^**
	4~8	0.065	0.356^**	0.083	-0.147^*	-0.207^*	0.179^**
	8~16	-0.325^**	0.084	0.546^**	0.383^**	0.006	0.285^**
	16~32	-0.232^**	-0.266^**	0.085	0.282^**	0.288^**	-0.031
	>32	-0.414	0.000	-0.143	-0.110	0.061	-0.284
	总	-0.099	0.143^*	0.223^**	0.128^*	-0.055	0.187^**

	砾石粒径/mm	G_m
	砾石粒径/mm	2~4	4~8	8~16	16~32	>32	总
G_mc （0~5 cm）	2~4	0.354^**	-0.091	-0.439^**	-0.374^**	-0.193^*	-0.426^**
	4~8	0.093	0.394^**	0.033	0.131^*	-0.174^*	0.036
	8~16	-0.322^**	0.179^**	0.472^**	0.378^**	0.066	0.452^**
	16~32	-0.226^**	-0.213^*	0.080	0.292^**	0.290^**	0.185^*
	>32	-0.470^*	-0.177	-0.223	0.100	0.187	0.018
	总	-0.090	0.170^**	0.180^**	0.150^*	-0.020	0.226^**

Land graveling characteristics and monitoring indicators of the Alxa Plateau

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	砾石粒径/mm	G_c
	砾石粒径/mm	2~4	4~8	8~16	16~32	>32	总
G_mc （5~10 cm）	2~4	0.301^**	-0.042	-0.273^**	-0.180^**	-0.130	-0.096
	4~8	0.117	0.072	-0.042	-0.081	-0.211^*	0.051
	8~16	-0.079	-0.059	0.117	0.132	-0.105	0.070
	16~32	0.015	-0.295^**	-0.304^**	-0.011	0.060	-0.287^**
	>32	-0.130	-0.413	-0.360	0.064	0.050	-0.436
	总	0.128^*	0.022	-0.075	-0.037	-0.120	0.019

	砾石粒径/mm	G_m
	砾石粒径/mm	2~4	4~8	8~16	16~32	>32	总
G_mc （5~10 cm）	2~4	0.283^**	-0.100	-0.239^**	-0.217^**	-0.098	-0.236^**
	4~8	0.103	0.035	-0.043	-0.106	-0.187^*	-0.072
	8~16	0.013	-0.057	0.129	0.095	-0.108	0.108
	16~32	-0.105	-0.346^**	-0.344^**	0.021	-0.059	-0.177
	>32	-0.088	-0.522^*	-0.343	0.015	0.018	-0.328
	总	0.139^*	-0.034	-0.074	-0.089	-0.127	-0.052