Relationship between vegetation community and soil moisture in the loess region of northern Shaanxi Province

doi:10.11686/cyxb2018775

Abstract

Abstract: We analyzed the trend in soil water content in the 0-100 cm soil layer and its relationship with the species diversity of vegetation community. These analyses were conducted in three reference regions with different precipitation conditions; Baibao, Chaigou and Wangwazi, in Wuqi County, Shaanxi Province. The overall aim of these analyses was to obtain reference information to devise strategies for vegetation construction and landscape configuration in the local loess region. The results showed that the amount of precipitation in Wuqi County gradually decreased from southeast to northwest. There were 57 species of 47 genera in 20 families in the three reference regions, among which 38 species of 29 genera in 12 families were herbage, and 61.7% of the genera and 68.4% of the species were in the Asteraceae, Poaceae, Rosaceae, and Fabaceae. The soil water content in the 0-100 cm soil layer in Baibao, Chaigou and Wangwazi was 14.4%, 12.7%, and 8.7%, respectively. With decreasing precipitation in the three regions, the importance values of herbage varied significantly, but the composition of vegetation communities was similar among the three regions. The values of the species richness index, Shannon-Wiener index, Pielou index, and Simpson’s index of the vegetation community decreased from Baibao to Chaigou to Wangwazi. There was a significant positive correlation between soil water content and the species diversity index of the vegetation community. In conclusion, herbaceous species were the most abundant in the three reference regions. The soil moisture content in the 0-100 cm soil layer was significantly affected by the precipitation gradient, and was closely related to vegetation community characteristics.

Key words: northern Shaanxi Province, loess, vegetation community, soil moisture, precipitation gradient

PUYANG Xue-hua, WANG Chun-chun, GOU Qing-ping, ZHAO Zhi-jie, HUANG Juan. Relationship between vegetation community and soil moisture in the loess region of northern Shaanxi Province[J]. Acta Prataculturae Sinica, 2019, 28(11): 184-191.

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