放牧对荒漠灌丛草地土壤团聚体组成及其稳定性的影响

doi:10.13866/j.azr.2021.01.10

Abstract

Abstract:

We studied the effects of different grazing intensities upon soil physical-chemical properties, aggregates composition and stability, nutrients, and the C/N ratio in the Alxa desert steppe. We observed that heavy grazing decreased soil’s organic carbon and total nitrogen contents in the 0-5 cm, 5-10 cm, and 10-20 cm layers while increased soil’s bulk density compared to light grazing. In all layers, 0.053-0.250 mm aggregates were dominant. Both mean weight diameter and geometric mean diameter of soil aggregates decreased, whereas soil fractal dimension increased, indicating damages to the soil aggregates’ structure and stability decrease. Heavy grazing decreased larger soil aggregates (0.25-2.00 mm) to smaller ones (0.053-0.250 mm and <0.053 mm) and increased the C/N ratio of soil aggregates, limiting the release of available nutrients and causing nutrients deficiency. We conclude that heavy grazing is a vital degradation factor for the Alxa desert steppe’s soils.

Key words: grazing intensity, soil aggregate, stability, soil nutrients

QI Zhengchao,CHANG Peijing,LI Yongshan,TIAN Xuemei,LI Xudong,GUO Ding,NIU Decao. Effects of grazing intensity on soil aggregates composition, stability, nutrients and C/N in desert shrubland[J].Arid Zone Research, 2021, 38(1): 87-94.

Figures/Tables 6

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References 31

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土层/cm	放牧强度	土壤有机C/(g·kg^-1)	土壤全N/(g·kg^-1)	C/N	土壤容重/(g·cm^-3)	土壤颗粒组成/%
土层/cm	放牧强度	土壤有机C/(g·kg^-1)	土壤全N/(g·kg^-1)	C/N	土壤容重/(g·cm^-3)	砂粒（>50 μm）	粉粒（2~50 μm）	黏粒（<2 μm）
	LG	4.32±0.10a	0.76±0.03a	5.63±0.01c	1.44±0.03b	82.13±0.14a	15.35±0.13b	2.52±0.02a
0~5	MG	4.14±0.05a	0.74±0.02a	5.73±0.00b	1.43±0.01b	77.02±0.50b	20.49±0.43a	2.49±0.07a
	HG	3.34±0.06b	0.59±0.04b	5.86±0.02a	1.51±0.02a	88.14±0.05c	10.04±0.04c	1.82±0.01b
	LG	4.02±0.08a	0.63±0.02a	6.23±0.07b	1.36±0.01c	73.00±0.25c	23.80±0.21a	3.20±0.04a
5~10	MG	3.78±0.07b	0.58±0.01b	6.41±0.01b	1.40±0.01b	74.69±0.33b	22.55±0.29a	2.76±0.05b
	HG	3.40±0.02c	0.51±0.01c	6.88±0.20a	1.49±0.02a	90.33±0.02a	8.28±0.01b	1.39±0.01c
	LG	3.82±0.02a	0.58±0.02a	6.50±0.01a	1.33±0.01c	76.57±0.26c	20.88±0.23a	2.55±0.03b
10~20	MG	3.79±0.03a	0.57±0.01a	6.56±0.00a	1.38±0.02b	75.60±0.33b	21.22±0.18a	3.19±0.03a
	HG	3.14±0.02b	0.49±0.02b	6.56±0.00a	1.52±0.02a	84.98±0.17a	12.87±0.15b	2.15±0.03c

土层/cm	放牧强度	平均重量直径(MWD)	几何平均直径(GMD)	分形维数(D)
	LG	0.21±0.01a	0.15±0.02a	2.61±0.02b
0~5	MG	0.17±0.02ab	0.14±0.01a	2.87±0.05a
	HG	0.16±0.01b	0.12±0.02a	2.93±0.08a
	LG	0.21±0.01a	0.16±0.02a	2.80±0.03b
5~10	MG	0.18±0.01b	0.15±0.01ab	2.85±0.04ab
	HG	0.17±0.02b	0.13±0.02b	2.91±0.02a
	LG	0.20±0.01a	0.15±0.02a	2.80±0.03b
10~20	MG	0.17±0.01a	0.15±0.01a	2.84±0.03b
	HG	0.17±0.02a	0.14±0.02a	2.94±0.02a

土层/cm	放牧强度		土壤团聚体C/N值
土层/cm	放牧强度	0.25~2 mm	0.053~0.25 mm	< 0.053 mm
0~5	LG	8.75±0.26b	22.63±1.24b	4.25±0.10a
	MG	8.14±0.15b	27.41±2.01b	4.17±.0.05a
	HG	19.40±0.68a	50.99±4.29a	4.21±0.09a
	LG	8.56±0.34b	27.19±1.19b	5.45±0.13a
5~10	MG	12.71±1.09b	17.63±0.76c	5.54±0.03a
	HG	23.05±1.52a	40.19±2.92a	5.43±0.03a
	LG	20.91±1.05b	19.11±0.48b	6.10±0.14a
10~20	MG	18.61±0.97b	21.41±0.41b	6.15±0.06a
	HG	28.63±1.11a	38.68±1.02a	6.06±0.06a

Effects of grazing intensity on soil aggregates composition, stability, nutrients and C/N in desert shrubland

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