青海高寒区不同土地利用方式下土壤持水能力及影响因素

doi:10.13866/j.azr.2021.06.24

Abstract

Abstract:

In this study, the maximum soil water holding capacity (MC), capillary water capacity (CC), field capacity (FC), and basic soil physicochemical properties of different soil layers (0-10, 10-20, and 20-30 cm) were measured under three land use patterns of agriculture, forestry, and grassland along a 550 km north-south transect in eastern Qinghai province. Results showed that: (1) the mean MC, CC, and FC at 0-30 cm soil of forestland were 526.83 g·kg^-1, 469.75 g·kg^-1, and 408.29 g·kg^-1, respectively. For grassland, their values were 506.17 g·kg^-1, 446.37 g·kg^-1, and 384.89 g·kg^-1, respectively. All these values were significantly higher than those of farmland (306.62 g·kg^-1, 254.25 g·kg^-1, and 227.12 g·kg^-1, respectively; P< 0.05). (2) The MC, CC, and FC of forestland and grassland decreased gradually as soil depth increased. By comparison, no obvious changes in MC, CC, and FC occurred as soil depth in the farmland increased because of soil compaction. (3) Principal component analysis revealed that soil bulk density, porosity, and soil particle composition cumulatively contributed 79.07%-94.79% to soil water holding capacity (MC, CC, and FC) in the farmland, forestland, and grassland. (4) Redundancy analysis indicated that the explanations of different environmental factors on soil water holding capacity of agriculture, forestry and grassland from large to small are annual evaporation, altitude, annual rainfall and latitude. This study could provide a reference for soil quality evaluation, soil water management, and regulation under different land use types in alpine regions.

Key words: alpine region, land use pattern, soil water holding capacity, influencing factors, Qinghai

WANG Ziwei,HUANG Laiming,SHAO Ming’an,PEI Yanwu. Soil water holding capacity under different land use patterns in the Qinghai alpine region[J].Arid Zone Research, 2021, 38(6): 1722-1730.

Figures/Tables 7

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Tab. 1

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Tab. 3

References 28

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土地利用类型	土层深度	土壤容重 /(g·cm^-3)	土壤孔隙/%
土地利用类型	土层深度	土壤容重 /(g·cm^-3)	毛管孔隙度	非毛管孔隙度	总孔隙度
农地	0~10 cm	1.41±0.04Ab	36.46±0.55Ca	9.21±1.61Aa	45.67±1.32Ba
	10~20 cm	1.47±0.03Aa	36.70±0.69Ca	7.35±0.62Aab	44.05±0.91Cb
	20~30 cm	1.48±0.02Aa	37.48±0.50Ca	5.60±1.06Ab	43.08±1.14Cb
	平均值	1.46±0.02A	36.88±1.01C	7.38±1.99A	44.27±1.24C
林地	0~10 cm	1.03±0.04Bc	52.47±1.73Aa	5.98±0.68Bb	58.45±1.50Aa
	10~20 cm	1.12±0.03Cb	49.90±1.59Ab	6.54±0.94Aa	56.44±1.28Ab
	20~30 cm	1.21±0.04Ca	48.57±1.67Ab	6.42±0.84Aab	54.99±1.48Ac
	平均值	1.12±0.02C	50.59±1.60A	6.38±0.40A	56.98±1.35A
草地	0~10 cm	1.03±0.04Bc	50.58±1.34Ba	7.05±0.66Ba	57.63±1.25Aa
	10~20 cm	1.18±0.03Bb	47.73±1.16Bb	6.26±0.68Aa	53.98±1.12Bb
	20~30 cm	1.29±0.04Ba	44.77±1.15Bc	5.69±0.62Aa	50.46±1.25Bc
	平均值	1.16±0.02B	47.69±2.60B	6.33±0.87A	54.02±3.11B

变量	农地		林地			草地
变量	PC1	PC2	PC1	PC2	PC3	PC1	PC2
特征值	5.03	1.40	3.68	1.74	1.22	5.13	1.20
方差/%	71.82	20.05	52.53	24.87	17.39	64.10	14.97
贡献率/%	71.82	91.87	52.53	77.40	94.79	64.10	79.07
BD/(g·cm^-3)	-0.92	0.20	-0.90	-0.31	0.07	-0.95	-0.03
CP/%	0.12	0.97	0.85	-0.17	-0.48	0.81	0.55
NP/%	0.86	-0.50	-0.13	0.74	0.62	0.25	-0.86
TP/%	0.98	-0.05	0.92	0.22	-0.21	0.92	0.10
SOM/(g·kg^-1)	0.89	0.02	0.59	0.73	0.06	0.77	0.13
Clay/%	-0.93	-0.28	-0.71	0.47	-0.51	-0.91	0.12
Silt/%	-	-	-	-	-	-0.66	0.27
Sand/%	0.91	0.31	0.65	-0.52	0.54	0.90	-0.19

环境因子	环境因子所占解释量/%	F	P
Ea	33.60	11.10	0.002
ALT	29.30	9.10	0.008
MAP	20.40	5.60	0.022
LAT	16.90	4.50	0.040

Soil water holding capacity under different land use patterns in the Qinghai alpine region

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