潮河源头不同水源涵养林的土壤饱和导水率

doi:10.16843/j.sswc.2021.01.006

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Abstract [Background] In order to enhance the water source conservation capacity and alleviate the problem of the current interruption at the source of the Chaohe, in recent years, a large number of afforestation projects for the purpose of conserving water resource have been implemented in the source area of the Chaohe. We aim to explore the characteristics of soil saturated hydraulic conductivity (K_s) of water conservation forests in Chaohe source and to assess the effects of soil physicochemical properties on soil saturated hydraulic conductivity. Then we scientifically assess the function of water conservation forests through the research results. [Methods] We measured soil saturated hydraulic conductivity (K_s)of 5-type water conservation forests (Pinus tabuliformis forest land, Larix gmelinii×P. tabuliformis forest, P. tabuliformis ×Armeniaca sibirica forest land, Platycladus orientalis×A. sibirica forest land, and P. orientalis forest land) and wasteland using constant-hydraulic head method, analyzed the relationship between K_s and soil physical factors and organic matter with correlation analysis, and assessed the dominant factors affecting K_s by principal component analysis. [Results] 1) The average K_s of various forests ranks in descending order as follows:P. tabuliformis×A. sibirica forest land>P. orientalis×A. sibirica forest land> P. tabuliformis×L. gmelinii forest land> P. tabuliformis forest land> P. orientalis forest land> wasteland, showing that K_s demonstrates a negative exponent as the depth of soil increases. The effect of forest stand on improving surface soil is better than that of deep soil. The P. tabuliformis×A. sibirica forest land has the highest water resource conservation capacity among these 5 forests. 2) K_s is exponentially related to bulk density and clay content, and the soil K_s decreases with the increase of the content of these two influencing factors. K_s has a power function relationship with total porosity, capillary porosity, silt content and sand content. K_s has a linear relation with organic matter content as well. The effect of organic matter on K_s is to improve the structure of soil and colloids.3) The dominant factors affecting K_s include soil unit weight, organic matter content, capillary porosity and clay content. Soil unit weight, organic matter and capillary porosity have the highest effect on soil saturated hydraulic conductivity, followed by soil clay content. The four factors play important roles in affecting soil saturated hydraulic conductivity. Soil total porosity, silt content and sand content have little effect on soil saturated hydraulic conductivity. [Conclusions] Through the comparison between the forests and the wasteland, we find that the soil K_s of P. tabuliformis×A. sibirica forest is the highest, followed by the P. orientalis×A. sibirica forest land. And it is advised that coniferous and broad-leaved mixed forests should be the priority for future water conservation forests construction, especially P. tabuliformis×A. sibirica forest land.

Key words： water conservation forest soil saturated hydraulic conductivity soil physicochemical property dominant factors Chaohe headwater

Received: 07 September 2019

PACS:

S727.21

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	YIN Zhao
	GONG Bo
	SHI Chen
	SHI Changqing

Cite this article:

YIN Zhao,GONG Bo,SHI Chen, et al. Soil saturated hydraulic conductivity of water conservation forests in Chaohe headwater[J]. SSWC, 2021, 19(1): 43-51.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.01.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I1/43

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