NDLI: Temporal change in soil macropores measured using tension infiltrometer under different land uses and slope positions in subtropical China

Content Provider	Springer Nature Link
Author	Zhang, Zhongbin Lin, Lin Wang, Yi Peng, Xinhua
Copyright Year	2015
Abstract	Soil macropores play a principal role in water infiltration but they are highly variable. The objectives of this study were (1) to investigate the temporal change in macropores of an Ultisol as affected by land use and slope position and (2) to analyze contribution of macropores to water infiltration.Water infiltration was measured at upper and lower slopes in citrus orchard and watermelon field once every 2 months for 1 year using tension infiltrometers at a successive pressure head from −12, −6, −3, to 0 hPa.Hydraulic conductivity (K) was significantly affected by land use and slope position except at 0 hPa pressure head, showing a significant temporal variation. Effective macroporosity, derived from the increment of hydraulic conductivity between −3 and 0 hPa, showed a significant temporal variation. Such temporal variation was land use (P < 0.05) and slope position (P < 0.001) dependent. Despite of low proportion in total soil volume (averaged 3.5 cm$^{3}$ m$^{−3}$), the macropores contributed 47 % of water flux on average. The macroporosity was more stable and higher in the citrus orchard (2.43 cm$^{3}$ m$^{−3}$, coefficient of variance (CV) = 75 %) than in the watermelon field (1.72 cm$^{3}$ m$^{−3}$, CV = 117 %) and contributed more to infiltration in the citrus orchard (60 %, CV = 16 %) than in the watermelon field (33 %, CV = 43 %) as well, because tillage was operated only in the watermelon field.No-tillage increased water conducting macropores but did not increase hydraulic conductivity irrespective of slope position.
Starting Page	854
Ending Page	863
Page Count	10
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	16
Issue Number	3
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-11-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Macropore Soil structure Tension infiltrometer Water infiltration Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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