岷江上游河谷土壤发生的空间分异及环境意义

doi:10.13249/j.cnki.sgs.2017.02.013

Abstract

Abstract:

Investigation on the pedogenesis of soils from the upper reaches of the Minjiang River is necessary for ecological reconstruction and vegetation restoration in this region. The soils development from the valley of the upper Minjiang River and the Jiuding Mountain were investigated based on the physical and chemical properties such as grain size distribution, oxide of iron, organic matter, carbonate, pH, organic stable isotope, cation exchange capacity, and clay mineralogy. The well development and eluviation prevailed in the soils from the Sanjiang to the Yingxiou, demonstrated by the higher values of clay/silt, iron free degree, clay and organic mater contents and lower values of carbonate content, pH and organic δ¹³C, indicating an environmental property of warm-wet climatic conditions and prevailed trees. However, the soils from the Caopo to the Fengyi were characterized by the higher sand and carbonate contents, pH and organic δ¹³C, and lower values of iron free degree and organic mater content, showing an arid climate in where C₄ vegetation prevail. The clay/silt and organic mater content increase, iepidocrocite arising and calcite lack occurred in the high altitude region of the Jiuding Mountain, indicating a wet climatic condition. While the soils under 2000 metre above sea level presented an arid climatic feature, as demonstrated by the lower values of clay/silt and contents of clay and organic mater, as well as the higher calcite content and pH.

Key words: pedogenesis, spatial heterogeneity, arid valley, the upper Minjiang River, the Jiuding Mountain

CLC Number:

S151.1

Xingyue Wen, Yanjuan Huang, Chengmin Huang. Spatial Heterogeneity and Environmental Significance of Pedogenesis in Soils from Valley of the Upper Minjiang River[J].SCIENTIA GEOGRAPHICA SINICA, 2017, 37(2): 266-273.

Figures/Tables 6

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样号	海拔（m）	成土母质	土地覆被	深度(cm)	根系	砾石	土壤颜色
P1	3480	变质岩风化坡积物	草甸	0~10	多	较少	黑灰棕 10YR4/2
P2	3440	变质岩风化坡积物	灌草地	0~10	多	少	棕 10YR5/3
P3	3245	变质岩风化坡积物	林地	0~10	多	无	深黑灰棕 10YR3/2
P4	3021	变质岩风化坡积物	林地	0~10	多	少	棕 10YR5/3
P5	2550	变质岩风化坡积物	灌木林	0~10	多	少	棕 10YR5/3
P6	2315	变质岩风化坡积物	林地	0~10	多	少	黑灰 10YR4/1
P7	2085	黄土母质	人工林	0~10	多	少	浅灰 10YR7/2
P8	1840	黄土母质	荒草地	0~10	多	少	浅黄棕 10YR6/4

样号	海拔（m）	伊利石	石英	方解石	高岭石	纤铁矿
P1	3480	+++++	+++	—	+++	—
P2	3440	+++++	++	—	+++	+
P3	3245	+++++	+++	—	++	+
P4	3021	+++++	+++	—	+++	—
P5	2550	+++++	+++	—	++++	—
P6	2315	+++++	+	—	++++	—
P7	2085	+++++	++	+	+++	—
P8	1840	+++++	+	++++	++	—

Spatial Heterogeneity and Environmental Significance of Pedogenesis in Soils from Valley of the Upper Minjiang River

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