长期围封对高寒草地土壤团聚体稳定性和可蚀性的影响

doi:10.13866/j.azr.2022.06.14

Abstract

Abstract:

To evaluate the effects of long-term enclosure measures on the stability and erodibility of soil aggregates, the grassland (alpine meadow, alpine meadow steppe, and alpine steppe) with long-term enclosure (fenced in 1984) and free grazing were selected as the research objects. The composition, mean weight diameter (MWD), geometric mean diameter (GMD), and soil erodibility (K value) of water-stable aggregates in 0-5, 5-10, 10-20, and 20-30 cm soil layers were analyzed. The results showed that: (1) The minimum MWD value appeared in the 0-5 cm soil layer of the alpine meadow under free grazing treatment (1.75 mm). No significant difference was observed in the MWD and GMD of 20-30 cm soil layer under the enclosure and free grazing in an alpine meadow and alpine meadow steppe (P > 0.05), while the difference in alpine steppe was significant (P < 0.05). (2) The K value of 10-20 cm soil under free grazing was 0.136, so the anti-erosion ability was the weakest in all treatments. (3) The redundant analysis found that the changes in total potassium, total phosphorus, and pH were the most important factors affecting soil K value, and soil organic carbon was the most important factoraffecting MWD. (4) The 0-10 cm soil layer of Bayinbuluk alpine grassland was dominated by >2 mm macroaggregates. The long-term enclosure caused stronger stability of soil aggregates in the 0-10 cm soil layer. Moreover, grassland type, enclosure, and soil layer significantly affect the stability and erodibility of soil aggregates. This indicates that long-term enclosure could improve the soil aggregates’ water stability and erosion resistance.

Key words: long-term enclosure, alpine grassland, soil aggregate stability, soil erodibility, Bayinbuluk

YU Guangling,LI Kaihui,ZHOU Jianqin,LI Keyi,CONG Mengfei,HU Yang,WANG Xuyang,JIA Hongtao. Effects of long-term enclosure on soil aggregate stability and erodibility in Bayinbuluk alpine grassland[J].Arid Zone Research, 2022, 39(6): 1842-1851.

Figures/Tables 10

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References 31

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草地类型	处理	MWD/mm				GMD/mm
草地类型	处理	0~5 cm	5~10 cm	10~20 cm	20~30 cm	0~5 cm	5~10 cm	10~20 cm	20~30 cm
高寒草甸	围封	4.22±0.05a	2.91±0.06b	2.62±0.10b	2.82±0.16b	2.17±0.14a	1.25±0.04b	1.09±0.06b	1.18±0.12b
高寒草甸	放牧	1.75±0.14b	3.04±0.15a	2.79±0.13a	2.68±0.21a	0.67±0.05b	1.22±0.08a	1.22±0.05a	0.93±0.15ab
高寒草甸草原	围封	2.17±0.16d	3.45±0.12b	4.22±0.17a	2.95±0.16c	0.61±0.07c	1.34±0.07b	1.95±0.23a	0.88±0.09c
高寒草甸草原	放牧	3.13±0.16b	3.89±0.07a	3.71±0.15a	2.80±0.10b	1.02±0.14b	1.72±0.04a	1.52±0.16a	0.80±0.05b
高寒草原	围封	3.40±0.14c	3.85±0.13ab	4.04±0.08a	3.63±0.11bc	1.19±0.13b	1.65±0.14a	1.79±0.09a	1.41±0.11ab
高寒草原	放牧	1.81±0.13a	1.94±0.09a	0.97±0.09b	1.32±0.14b	0.44±0.05b	0.57±0.01a	0.25±0.02c	0.39±0.05b

自变量	因变量	III类平方和	F
草地类型	MWD	5.560	54.897
	GMD	1.097	17.168
	K	0.010	89.411
围封	MWD	13.607	268.717
	GMD	4.147	129.814
	K	0.010	177.732
土层	MWD	3.015	19.845
	GMD	1.954	20.388
	K	0.002	14.023

Effects of long-term enclosure on soil aggregate stability and erodibility in Bayinbuluk alpine grassland

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